We provide states of matter practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on states of matter skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.

#### List of states of matter Questions

Question No | Questions | Class |
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1 | Q. 16 Under which of the following conditions applied together, a gas deviates most from the ideal behaviour? (a) Low pressure (b) High pressure (C) Low temperaturen (d) High temperature |
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2 | 16. Which state of matter consists of super energetic particles in the form of ionized gases? (a) Solid (b) Plasma (c) Liquid (d) All of these |
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3 | While mixing sugar with water, the level of water does not increase because A. matter has large particles which destroy water particles B. tiny particles of sugar adjust among the space between tiny particles of water C. tiny particles of sugar destroy large particles of water D. none of above |
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4 | Q. 12 Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature? (a) Increase (b) No effect (c) Decrease (d) No regular pattern will be followed |
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5 | Calculate the ratio of average K.E of one molecule of diatomic (rigid) and diatomic (elastic)at temperature ( 150^{circ} mathrm{C} ) |
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6 | Which one of the following is not a category of states of matter? A. Solid B. Liquid c. Gas D. Semi-liquid |
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7 | Q. 7 As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant ? (a) Increases (b) Decreases (c) Remains same (d) Becomes half |
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8 | Gas Density ( A ) [ begin{array}{l} 0,82 g L^{-1} \ 0,26 g L^{-1} end{array} ] ( 0.51 g L^{-1} ) Pick up the correct statement/ statements. 1. Gas ( A ) will tend to lie at the bottom. 2. The number of atoms of various ( operatorname{gases} A, B ) and ( C ) are same. 3. The gases will diffuse to form homogeneous mixture. 4. Average kinetic energy of each gas is same. ( mathbf{A} cdot 2,3 ) в. 1,4 ( c cdot 1 ) D. 3,4 |
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9 | Temperature above which gas cannot be liquefied is called critical temperature, ( T_{c} ) If true enter 1 , else enter 0 ( A ) |
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10 | The reaction, ( 2 S O_{2}(g)+O_{2}(g) rightleftharpoons ) ( 2 S O_{3}(g) ) is carried out in a ( 1 d m^{3} ) vessel and ( 2 d m^{3} ) vessel respectively. The ratio of the reaction velocities will be: ( A cdot 1: 4 ) B. 2:4 c. 1: 8 D. 8: 1 |
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11 | Assertion The gases ( H e ) and ( H_{2} ) are very different in their behaviour at any temperature and pressure but their compressibility factors are nearly the same at the critical point. Reason They have nearly the same critical constant. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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12 | Give reasons for the following observation: The smell of hot sizzing food several metres away, but to get the smell from cold food you have to go close. |
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13 | The change in volume ( V ) with respect to an increase in pressure P has been shown in the adjoining figure for a non- ideal gas at four different temperatures ( T_{1}, T_{2}, T_{3} ) and ( T_{4} . ) The critical temperature of the gas is: A ( cdot T_{1} ) ( mathbf{B} cdot T_{2} ) ( c cdot T_{3} ) ( mathbf{D} cdot T_{4} ) |
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14 | Regarding dipole-dipole attractions the incorrect statement is: This question has multiple correct options A. dipole-dipole attractions are more, if the molecules have height dipole moment values. B. in liquid ( H B r ) dipole-dipole attractions are present C. dipole-dipole interaction energy between stationary polar molecules as in solids ( propto r^{-3} ) D. dipole-dipole interaction energy between rotating molecules ( propto r^{6} ) |
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15 | When you open a soft drink bottle, the bubbles oozes through the opening. The bottle contains gas which is highly compressed. Guess the gas. A. Dry ice B. Carbon dioxide c. oxygen D. Nitrogen |
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16 | State and explain Gay Lussac’s law of combining volumes | 11 |

17 | State True or False. A mixture of ideal gases is cooled up to liquid helium temperature ( (4.2 K) ) to form an ideal solution. A. True B. False |
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18 | If a gas is expanded at constant temperature: A. the pressure increases B. the kinetic energy of the molecules remains the same C. the kinetic energy of the molecules decreases D. the number of molecules of the gas increases |
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19 | When an ideal gas undergoes expansion through a porous plug, the gas is expected to exhibit no cooling because A. there exist no molecular forces of attraction B. the molecules collide with each other, without any loss of energy C. the volume occupied by molecules is negligible in comparision to the volume of the gas D. none of the above |
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20 | Calculate the kinetic energy of 5 mole of a gas at ( 27^{circ} mathrm{C} ) in erg and calorie. |
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21 | When sugar is mixed with water and stirred then: A. it floats for some time and then starts dissolving B. it settles down and do not dissolves C. it dissolves immediately on stirring D. none of the above |
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22 | The van der Waals forces in halogens increase in the order: A ( cdot mathrm{F}_{2}<mathrm{Cl}_{2}<mathrm{Br}_{2}mathrm{Cl}_{2}>mathrm{Br}_{2}>mathrm{F}_{2} ) c. ( mathrm{F}_{2}<mathrm{Br}_{2}<mathrm{I}_{2}<mathrm{Cl} ) D. ( operatorname{Br}_{2}<mathrm{F}_{2}<mathrm{Cl}_{2}<mathrm{I}_{2} ) |
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23 | The density of ( C O ) at ( 273 K ) and 1 atm is ( 1.2504 mathrm{kg} mathrm{m}^{-3} ). Calculate (a) root mean square speed (b) the average speed and (c) most probable speed. |
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24 | Two glass bulbs ( A ) and ( B ) are connected by a very small tube having a stop cock. Bulb A has a volume of ( 100 mathrm{cm}^{3} ) and contained the gas, while bulb B was empty. On opening the stop cock, the pressure fell down 40%. The volume of the bulb B must be ? A ( .75 mathrm{cm}^{3} ) В. ( 125 mathrm{cm}^{3} ) ( c cdot_{150} c m^{3} ) D. ( 250 mathrm{cm}^{3} ) |
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25 | ( sqrt[n]{[-1]} ) ( i ) ( underbrace{frac{pi}{n} underbrace{n}_{n}+underbrace{ }_{rightarrow n}} ) |
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26 | Which of the following possess fluidity? A. Alcohol B. Rubber c. oxygen D. Both a and c |
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27 | Dispersion forces: A. Water B. Hydrogen bromide C. Iron D. Argon E . Sodium chloride |
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28 | 1 g of helium gas is confined in a two litre flask under a pressure of 2.05 atm. What is its temperature? |
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29 | Q1. A weather balloon has a volume of 175 dm3 when filled with hydrogen gas at a pressure of 1.0 bar. Calculate the volume of the balloon when it rises to a height where the atmospheric pressure is 0.8 bar. Assume that temperature is constant. |
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30 | 1. Two thermally insulated vessels, 1 and 2, are filled with air at temperature (T. T.), volumes (V1, V2), and pressures (P1, P2), respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be (a) T, + T2 (b) (T; +T2)/2 (c) T;72(PV, +P212) PVT2+PV21 (d) TT2(PV +P212) PVT+PV212 (AIEEE 2004) |
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31 | compounds are soluble in polar solvent. |
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32 | Critical temperature of ( C O_{2} ) is ( 31.2^{circ} C ) In summer, the room temperature is ( 40^{circ} mathrm{C}: ) A. ( C O_{2} ) cannot be liquefied B. Can be liquefied with increase of pressure c. can be liquefied with decrease of pressure D. can be liquefied if temperature of ( C O_{2} ) is decreased below 31.2 |
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33 | ( 0.303 mathrm{g} ) of the organic compound in Duma’s method on combustion gave ( 32.27 mathrm{ml} ) of moist nitrogen at ( 27^{circ} mathrm{C} ) and at P mm of Hg pressure. The vapour pressure at ( 27^{circ} mathrm{C} ) is ( 21 mathrm{mm} ) of Hg. Find the value of P. A. ( 725 mathrm{mm} ) of ( mathrm{Hg} ) B. ( 746 mathrm{mm} ) of ( mathrm{Hg} ) c. ( 710 mathrm{mm} ) of ( mathrm{Hg} ) D. ( 760 mathrm{mm} ) of ( mathrm{Hg} ) |
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34 | Where on the phase diagram is there an equilibrium between liquids and gases? A. Graph between ( A ) and ( B ) B. Graph ( A ) c. Graph between ( B ) and ( C ) D. Graph ( A, B ), and ( C ) |
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35 | The volume of 0.5 moles of a gas at 273 ( mathrm{K} ) and ( 380 mathrm{mm} ) pressure is: A . 11.2 lit B. 22.4 litt c. 2.24 lit D. 1.12 litt |
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36 | ice Butane gas is used for fillling cylinders to be used as LPG because (a) it is easily available (6) it is easily compressed into a liquid and stored in cylinders (c) it is stored in gaseous state only in the cylinder (d) it is the cheapest ga available |
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37 | Which of the following statements is false? A ( cdot ) At temperature equal to ( frac{a}{R b} ) (where a and b are vander Waal’s constant). real gases obey ideal gas laws over an appreciable range of pressure B. Most probable speed of a gas is always greater than its average speed C. Dalton’s law of partial pressure is not valid for reacting gases D. A gas cannot be liquified above its critical temperature |
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38 | An ideal gas in a closed inflexible container has a pressure of 6 atm and a temperature of ( 27^{circ} mathrm{C} ). What will be the new pressure at ( -73^{circ} mathrm{C} ) ? ( A cdot 2 a t m ) B. 3 atm c. 4 atm D. 8 atm E . 9 atm |
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39 | Which among the following is not the property of ideal gas? A. It consists of a large number of identical molecules. B. They do not obeys Newtons law of motion. C. The volume occupied by the molecules themselves is negligible compared to the volume occupied by the gases D. They obeys Newtons law of motion. |
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40 | ( 6 times 10^{22} ) gas molecules each of mass ( 10^{-24} mathrm{kg} ) are taken in a vessel of 10 litres. What is the pressure exerted by gas molecules if the average velocity of the gas molecules is ( 92.62 mathrm{m} / mathrm{sec} ? ) A ( cdot 2 times 10^{5} P a ) B. ( 20 P a ) c. ( 2 times 10^{6} P a ) D. ( 2 times 10^{4} P a ) |
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41 | A gas obeys the Van der Waals equation The approximate value of the constants a’ and ‘b’ for this gas are: ( mathbf{A} cdot 1.88 times 10^{6} c c^{2} a t m / m o l e^{2}, 120 c c / m o l e ) B . ( 3.16 times 10^{6} c c^{2} a t m / ) mole ( ^{2}, 30 mathrm{cc} / mathrm{mole} ) C. ( 3.16 times 10^{6} mathrm{cc}^{2} ) atm ( / mathrm{mole}^{2}, 50 mathrm{cc} / mathrm{mol} ) D. ( 0.86 times 10^{5} mathrm{cc}^{2} ) atm / mole ( ^{2}, 30 mathrm{cc} / mathrm{mole} ) |
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42 | What is meant by superconductivity? | 11 |

43 | 1. An alloy of Al and Cu is analyzed for % composition. A 0.2052 g sample of the alloy is dissolved in H,SO, and 229.5 mL of H, are collected at 700 torr and 28°C. The balanced equation is 2A1 + 3H2SO4 → Al2(SO2)3 + 3H, The % Al in alloy is: (a) 25.23% (b) 37.38% (c) 50.48% (d) 76.2% |
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44 | For a real gas obeying vander Waal’s equation a graph is plotted between ( P V_{m}(y=a x i s) ) and ( P(x-a x i s) ) where ( boldsymbol{V}_{m} ) is molar volume. Find ( boldsymbol{y}- ) intercept of the graph. |
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45 | An ideal gas is one which obeys? A. Boyle’s law B. Gas laws c. charle’s law D. Avogadro law |
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46 | The inversion temperature ( boldsymbol{T}_{boldsymbol{i}}(boldsymbol{K}) ) of hydrogen is: [Given: Van der Waal’s constants a and b ( operatorname{are} 0.244 operatorname{atm} L^{2} m o l^{-2} ) and ( left.0.027 L m o l^{-1} text {respectively }right] ) A ( cdot 440 ) в. 220 c. 110 D. 330 |
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47 | If ( P ) is the pressure of gas, then the kinetic energy per unit volume of the gas is: A ( . P / 2 ) в. ( P ) c. ( 3 P / 2 ) D. 2 |
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48 | Assertion Energy can be transferred between gaseous molecules during collisions but ( u_{mathrm{rms}} ) remains constant. Reason The average kinetic energy of gaseous molecules remains constant as long as the temperature is constant and therefore, ( u_{mathrm{rms}} ) remains unchanged during the collision. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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49 | Choose the correct statement from the following: This question has multiple correct options A ( . ) He gas diffuses ( sqrt{2} ) times more than ( O_{2} ) B. ( O_{2} ) gas diffuses 2 times more than ( S O_{2} ) ( mathrm{C} cdot mathrm{CH}_{4} ) gas diffuse ( sqrt{2} ) times more than ( mathrm{O}_{2} ) D. ( H_{2} ) difusses ( sqrt{2} ) times more than ( H e ) gas |
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50 | According to the Kinetic-Molecular Theory, the kinetic energy of the molecules increases when they are – A. mixed with other molecules at lower temperature B. frozen into a solid C . condensed into a liquid D. heated to a higher temperature E. Collide with each other in a container at a lower temperature |
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51 | In which of the following molecule dipole dipole interaction is absent: A . HCl B. water c. carbon dioxide D. нF |
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52 | Using both Charles’s law and Boyle’s law, we get : A ( cdot frac{T V}{P}=K ) В. ( frac{V P}{T}=K ) c. ( frac{T P}{V}=K ) D. none of the above |
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53 | Solids have infinite free surfaces while liquids have only one upper free surface. |
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54 | Two flask ( A ) and ( B ) of equal volumes maintained at temperature ( 300 K ) and ( 700 K ) contain equal mass of ( H e(g) ) and ( N_{3}(g) ) respectively. What is the ratio of total translational kinetic energy of gas in flask ( A ) to the flask ( B ? ) |
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55 | If ( eta_{2} ) and ( eta_{2} ) are the coefficients of viscosity of two liquids, ( d_{1} ) and ( d_{2} ) their densities and ( t_{1} ) and ( t_{2} ) the flow times in Ostwald viscometer, then A ( cdot frac{eta_{1}}{eta_{2}}=frac{d_{1} t_{2}}{d_{2} t_{1}} ) В. ( frac{eta_{1}}{eta_{2}}=frac{d_{2} t_{2}}{d_{1} t_{1}} ) c. ( frac{eta_{1}}{eta_{2}}=frac{d_{1} t_{1}}{d_{2} t_{2}} ) D. ( frac{eta_{1}}{eta_{2}}=frac{d_{2} t_{1}}{d_{1} t_{2}} ) |
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56 | Read the following statements and identify the incorrect statement. A. Volume of one mole of a gas at critical temperature is called molar volume. B. Pressure of a gas at critical temperature is called critical pressure. C. The critical temperature, pressure and volume are called critical constants. D. Critical temperature is the highest temperature at which a gas can exist as liquid, above this temperature it is a gas. |
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57 | At the same temperature and pressure, ratio of RMS velocities of ( C H_{4} ) and ( S O_{2} ) is: A . 4: 1 B. 1: 4 ( c cdot 1: 2 ) D. 2: 1 |
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58 | Which has maximum value of mean free path? A. ( C O_{2} ) в. ( H_{2} ) ( c cdot O_{2} ) D. ( N_{2} ) |
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59 | A gas will approach ideal behavior at: A. low temperature and low pressure B. low temperature and high pressure c. high temperature and low pressure D. high temperature and high pressure |
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60 | 0.44 Assertion (A) Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules. Reason (R) Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart. (a) Both A and Rare true and R is the correct explanation of A (b) Both A and R are true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true |
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61 | Pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. This law is popularly known as: A. Boyle’s law B. Charles’law c. Gay Lusac’s law D. Avogadro law |
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62 | Q39. Define hydrogen bonds. Is it weaker or stronger than the van der Waals forces? | 11 |

63 | Match the following: ( begin{array}{ll}text { List – I } & text { List – II } \ text { A. } P_{c} & text { (i) } 3 b \ text { B. } V_{c} & text { (ii) } 8 a / 27 b R \ text { C. } T_{c} & text { (iii) } a / 27 b^{2}end{array} ) ( mathbf{A} cdot A-(i), B-(i i), C-(i i i) ) B . ( A-(i i i), B-(i i), C-(i) ) c. ( A-(i i), B-(i i i), C-(i) ) D. ( A-(i i i), B-(i), C-(i i) ) |
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64 | nion Que lo 0.51 The variation of vapour pressure of different liquids with temperature is shown in figure (i) Calculate graphically boiling points of liquids A and B. (ii) If we take liquid C in a closed vessel and heat it continuously. At what temperature will it boil? (iii) At high altitude, atmospheric pressure is low (say 60 mm Hg). At what temperature liquid D boils? (iv) Pressure cooker is used for cooking food at hill station. Explain in terms of vapour pressure why is it so? 900 800 750 7003 liquid A Vapour pressure (mm Hg) – liquid B liquid C liquid D السلبييلسيليييلللننلييبله 60 V O o TTTTTTTTTTTTTTTTTTTTTTTTTTTT 273 293 313 333 353 373 Temperature (K |
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65 | Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids: Water and glycerine A. Hydrogen bonding B. London forces c. vander waal ‘s forces D. Steric repulsion |
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66 | At ( 0^{circ} mathrm{C} ) and a pressure of ( 1000 mathrm{mm}, ) a given weight of nitrogen occupies a volume of ( 1.0 l . A t-100^{circ} C, ) the same weight of gas under the same pressure occupies a volume of ( 0.61 . ) What is the value of absolute zero in degree Celsius? A . ( -250^{circ} mathrm{C} ) B. ( 250^{circ} mathrm{C} ) c. ( -273^{circ} mathrm{C} ) D. ( 273^{circ} mathrm{C} ) |
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67 | Explain how Charles’ law helps us in finding out the absolute zero value. | 11 |

68 | To use Charles’ Law, which of the following needs to remain constant? A. Pressure and the number of moles of a gas B. Pressure and temperature C. Temperature and the number of moles of a gas D. Pressure and volume E. Temperature and volume |
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69 | What are real gases? | 11 |

70 | Assertion Greater is critical temperature more easily a gas can be liquified. Reason Critical temperature depends on the magnitude of intermolecular forces of attraction between the gas. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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71 | Find the temperature of Hydrogen gas which has the same velocity as that of oxygen at a temperature of ( 0^{0} C ) A. ( 273 div 16 K ) В . ( 273 times 8 K ) c. ( 273 times 32 K ) D. ( 273 times 4 K ) |
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72 | The density of a gas ( A ) is twice that of ( B ) Molar mass of ( A ) is half that of ( B ). The ratio of partial pressure of ( boldsymbol{A} ) to ( boldsymbol{B} ) is: A. ( 1 / 4 ) B. ( 1 / 2 ) ( c cdot 4 / 1 ) D. 2/1 |
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73 | Q. 6 The pressure of a 1 : 4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen? (a) 0.8 x 10 atm (b) 0.008 Nm 2 (c) 8 x 104 Nm 2 (d) 0.25 atm |
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74 | ( boldsymbol{R}=frac{boldsymbol{x}}{boldsymbol{3}} frac{boldsymbol{P}_{c} boldsymbol{V}_{c}}{boldsymbol{T}_{c}} ) Value of ( x ) is |
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75 | The gas which is used for cooking at our home is A. oxygen B. Nitrogen c. L.P.G (liquefied petroleum gas) D. C.N.G (compressed natural gas) |
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76 | When we make tea, coffee or lemonade, particles of one type of matter get into the spaces between particles of the other. Why? A. Particles are too large B. Particles do not have space among them c. There are enough space between particles of matter D. None of above. |
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77 | 4 molecules of gas have speeds of ( 1,2,3,4 mathrm{cm} / mathrm{s} ) respectively. The root mean square velocity is: A. ( sqrt{7.5} mathrm{cm} / mathrm{s} ) B. 30 cm/s c. ( 45 mathrm{cm} / mathrm{s} ) D. ( 15 mathrm{cm} / mathrm{s} ) |
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78 | 0.3 A plot of volume (V) versus temperature (T) for a gas at constant pressure is a straight line passing through the origin. The plots at different values of pressure are shown in fiqure. Which of the following order of pressure is correct for this gas? POLO Volume (ML) — PA Temperature (K) (a) p > P2 > > P4 (c) P; <P2 <P4 |
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79 | Random movement of particles was discovered by: A. Robert Brown B. E. Goldstein c. James chadwick D. Wilheln Weins |
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80 | Which of the following is not a correct postulate of kinetic theory of gases? A. The molecules of a gas are continuously moving in different directions with different velocities. B. The average kinetic energy of the gas molecules is directly proportional to the absolute temperature of the gas. C. The volume of the gas is due to the large number of molecules present in it. D. The pressure of the gas is due to the collision of the molecules on the walls of the container. |
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81 | Q Type your question situation. Only atmospheric pressure is exerted on I. the exposed mercury surface in the right side of the tube. II. The gas pressure is greater than atmospheric pressure. III. The difference in the height of mercury levels is equal to the pressure of the gas A. II only B. III only C. I and II only D. I and III only E. I, II and III |
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82 | Assertion The gases exert pressure. Reason Molecules exert pressure when they collide with the walls of the container in which they are taken. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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83 | 40. Which of the following gases has the highest average velocity at a certain temperature ? (1) Methane (2) Oxygen (3) Carbon monoxide (4) Neon |
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84 | Which of the following order of root mean square speed of different gases at the same temperature is true? A ( cdotleft(U_{r m s}right)_{H_{2}}>left(U_{r m s}right)_{C H_{4}}>left(U_{r m s}right)_{N H_{3}}>left(U_{r m s}right)_{C O} ) B . ( left(U_{r m s}right)_{H_{2}}<left(U_{r m s}right)_{C H_{4}}<left(U_{r m s}right)_{N H_{3}}<left(U_{r m s}right)_{C O} ) C. ( left(U_{r m s}right)_{H_{2}}left(U_{r m s}right)_{N H_{3}}>left(U_{r m s}right) ) Co ( _{2} ) D. ( left(U_{r m s}right)_{H_{2}}>left(U_{r m s}right)_{C H_{4}}<left(U_{r m s}right)_{N H_{3}}<left(U_{r m s}right)_{C O} ) |
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85 | 0.37 Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order in one line. Water, hexane (CH3CH2CH2CH2CH2CH3), glycerine (CH,OHCH(OH)CH2OH) |
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86 | Arrange the following objects in the order of the intermolecular force of attraction. ( Oxygen, Sugar, Water) A. Oxygen > Water> Sugar B. Sugar> Water> Oxygen c. water > sugar > Oxygen D. None of the above |
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87 | When 2 g of gas ( A ) is introduced into an evacuated flask kept at ( 25^{circ} mathrm{C} ), the pressure was found to be 1 atm. If 3 g of another gas B is then added to the same flask containing A, the pressure becomes 1.5 atm. Assuming ideal behaviour, the ratio of molecular weights ( left(M_{A}: M_{B}right) ) is : A . 1: 3 B. 3: ( c cdot 2: 3 ) D. 3: |
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88 | Find the total pressure exerted by ( 1.6 g ) methane and ( 2.2 g C O_{2} ) contained in a four litre flask at ( 27^{circ} mathrm{C} ) |
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89 | Under 3 atm, 12.5 litres of a certain gas mass 15 g. The average speed of the gaseous molecules is ( 8.03 times ) ( 10^{n} ) cmsec( ^{-1} ). The value of ( n ) is |
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90 | Water, milk, fruit juice, cold drinks are examples of which states of matter? A. Solid B. Liquid c. Gas D. Plasma |
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91 | Q6. A neon-dioxygen mixture contains 70.6 g dioxygen and 167.5g neon. If pressure of the mixture of gases in the cylinder is 25 bar. What is the partial pressure of dioxygen and neon in the mixture! |
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92 | One of the following did not work on gases: A. Avogadro B. Boyle c. charles D. Faraday |
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93 | In an experiment during the analysis of a carbon compound, 145 cc of ( H_{2} ) was collected at 760 mm of Hg pressure and ( 27^{circ} mathrm{C} ) temperature. The mass of ( boldsymbol{H}_{2} ) is nearly: A . ( 10 mathrm{mg} ) B. ( 12 mathrm{mg} ) c. ( 24 m g ) D. ( 6 mathrm{mg} ) |
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94 | According to the ideal gas law, what is the approximately volume that will be occupied by 0.5 mole of an ideal gas at ( 30^{circ} mathrm{C} ) and 3 atm pressure (gas constant ( boldsymbol{R}=mathbf{0 . 0 8 2 1} mathrm{L} operatorname{atm} mathrm{mol}^{-1} mathrm{K}^{-1} ) )? A. Less than 1 L в. 5 L ( c .10 L ) D. 15 L E. More than ( 20 L ) |
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95 | Why does aluminium chloride, ( A l_{2} C l_{6} ) sublime at the relatively low temperature of ( 180^{-circ} mathrm{C} ? ) 1 The intermolecular forces between the ( A l_{2} C l_{6} ) molecules are weak. 2 The co-ordinate bonds between aluminium and chlorine are weak. 3 The covalent bonds between aluminium and chlorine are weak. A. 1,2 and 3 are correct B. 1 and 2 only are correct c. 2 and 3 only are correct D. 1 only is correct |
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96 | The pressure of moist gas at a given temperature is ( 10 mathrm{mm} ) Hg at volume ( V ) Aqueous tension at this temperature is ( 3 mathrm{mm} ) Hg point the final pressure of gas at the same temperature if the volume is reduced to ( 1 / 3 ) original volume is: A. 30mm Hg B. 27mm Hg c. ( 24 mathrm{mm} ) ну D. ( 21 mathrm{mm} ) Hg |
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97 | Select the one that diffuses fastest at room temperature. (a) Petrol (b) Milk (c) Perfume (d) Camphor |
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98 | The van dar Waal’s parameters for gases ( W, X, Y ) and ( Z ) are: ( begin{array}{lll}text { Gas } & mathrm{a}left(mathrm{atm} l^{2} / mathrm{mol}^{2}right) & mathrm{b}(mathrm{l} / mathrm{mol}) \ mathrm{w} & 4.0 & 0.027 \ mathrm{x} & 8.0 & 0.030 \ mathrm{Y} & 6.0 & 0.032 \ mathrm{z} & 12.0 & 0.027end{array} ) Which one of these gases has the highest critical temperature? ( A cdot w ) B. ( x ) ( c ) ( D . z ) |
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99 | Universal gas constant R has the value? A . 0.08206 L. atm.mol ( ^{-1} K^{-1} ) B. ( 8.206 L . a t m . m o l^{-1} K^{-1} ) c. 8.314 L.atm.mol( ^{-1} K^{-1} ) D. 2L.atm.mol-1 ( K^{-1} ) |
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100 | Assertion Critical temperature is the temperature at which the intermolecular attraction in gas molecules vanishes. Reason At critical point, the density of substance in gaseous and liquid states becomes same. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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101 | A flask has a volume of ( 0.25 d m^{3} . ) What volume of air will be displaced from the flask if it is heated from ( 300 K ) to ( mathbf{3 6 0} boldsymbol{K} ? ) ( mathbf{A} cdot 0.25 d m^{3} ) в. ( 0.5 d m^{3} ) c. ( 0.05 d m^{3} ) D. None of these |
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102 | State True or False. Collision frequency depends upon mean free path A. True B. False |
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103 | A gas behaves most like an ideal gas under conditions of: A. high pressure and low temperature B. high temperature and high pressure c. low pressure and high temperature D. low pressure and low temperature |
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104 | When a real gas show behaviour same as ideal gas: A. At low temperature and low pressure B. At high temperature and high pressure C. At low temperature and high pressure D. At high temperature and low pressure |
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105 | Which curve in figure represents the curve of ideal gas? ( A cdot B ) only 3. ( C ) and ( D ) only c. ( E ) and ( F ) only D. ( A ) and ( B ) only |
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106 | Which type intermolecular force is most likely the most significant intermolecular force for a compound with a low boiling point and a medium molecular weight? A. Dipole-dipole attraction B. Hydrogen bonding c. van der waals forces D. None of the above |
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107 | If the intermolecular forces vanish away, the volume occupied by the molecules of ( 4.5 k g ) water at ( S T P ) will be: ( mathbf{A} cdot 5.6 m^{3} ) B. ( 5.6 L ) c. ( 11.2 L ) D. ( 11.2 m^{3} ) |
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108 | Study the figures given and identify the type of interaction between ( boldsymbol{X} boldsymbol{Y}-boldsymbol{X} boldsymbol{Y} ) molecules. (ii) A. Dipole – -Induced dipole B. Dipole – Dipole c. Dispersion forces D. Induced dipole – – Induced dipole |
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109 | Calculate the ratio of collision frequencies ( left(Z_{11}right) ) for the ( operatorname{gases} A, B, C ) respectively A . 1: 2: 4 B . 4: 2: 1 ( c cdot 1: 4: 16 ) D. 16: 4: 1 |
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110 | The decreasing order of diffusion is A. Gas > Solid > liquid B. Liquid > Gas > Solid c. solid > Liquid > Gas D. Gas > Liquid > Solid |
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111 | Give reasons: (a) A gas fills completely the vessel in which it is kept (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. |
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112 | The critical temperature of the gas is the tem perature: A. at which Charle’s law is obeyed B. at which Boyle’s law is obeyed C. above which the gas cannot be liquefied D. at which all molecular motion ceases |
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113 | For a real gas (mol. mass ( =30 ) ) if density at critical point is ( 0.40 mathrm{g} . mathrm{cm}^{3} ) and its ( T_{c}=frac{2 times 10^{5}}{821} K, ) then calcium Vander Waal’s constant ( a ) (in atm ( left.boldsymbol{L}^{2} boldsymbol{m} boldsymbol{o l}^{-2}right) ) |
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114 | 2. The compressibility of a gas is less than unity at STP. Therefore: (a) Vn> 22.4 litre (b) Vm<22.4 litre (c) V = 22.4 litre (d) V = 44.8 litre m |
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115 | The density of a gass is 3.80 g ( L^{-1} ) at S.T.P calculate is density at ( 27^{0} C ) and 700 torr pressure. |
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116 | A mixture of carbon monoxide and carbon dioxide is found to have a density of 1.7 g/lit at S.T.P. The mole fraction of carbon monoxide is: A . 0.37 B. 0.40 ( c cdot 0.30 ) D. 0.50 |
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117 | A gas cylinder containing cooking gas can withstand a pressure of 14.9 atm. The pressure guage of the cylinder indicates 12 atm at ( 27^{circ} mathrm{C} ). Due to sudden fire in the building, its temperature stats rising. At what temperature cylinder will explode? |
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118 | Which selection is a polar molecular substance with a weak dipole-dipole interaction? A. ( B a C l_{2} ) в. ( C H_{3} C l ) c. ( B I_{3} ) D. ( H_{2} O ) |
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119 | According to Charles’s law: This question has multiple correct options ( mathbf{A} cdot(d V / d T)_{P}=K ) ( mathbf{B} cdot(d V / d T)_{P}=-K ) ( mathbf{C} cdot(d V / d T)_{P}=-K / T ) D. ( V propto T ) |
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120 | Among the three types of velocities, which has greater value at a given temperature? A. Most probable velocity B. RMS velocity c. Average velocity D. All the three have same value |
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121 | Which of the following is wrong statement? A. Larger the ( T_{c} / P_{C} ) for a gas, larger would be excluded volume B. Critical temperature, ( T_{C}> ) Boyle’s temperature, ( T_{B} ) for any gas. ( mathbf{C} cdotleft[frac{partial T}{partial P}right]_{T_{i}}=0 ) for a van der Waal’s gas. D ( cdotleft[frac{partial P}{partial V}right]_{T_{C}}=0 ) for a van der Waal’s gas. |
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122 | The van der Waal’s constants for a gas ( operatorname{are} a=3.6 a t m quad L^{2} m o l^{2}, b= ) ( mathbf{0 . 6 L} quad boldsymbol{m o l}^{-1} . ) If ( boldsymbol{R}= ) ( begin{array}{lll}mathbf{0 . 0 8} mathbf{L} & mathbf{a t m} & mathbf{K}^{-mathbf{1}} mathbf{m o l}^{-mathbf{1}} text { and the }end{array} ) Boyle’s temperature ( (K) ) is ( T_{0} ) of this gas, then what is the value of ( frac{T_{B}}{15} ? ) |
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123 | 5. A vessel of volume V = 7.5 l contains a mixture of ideal gases at a temperature T = 300 K: V = 0.10 mole of oxygen, V, 0.20 mole of nitrogen, and va=0.30 mole of carbon dioxide. Assuming the gases to be ideal, find: (a) the pressure of the mixture; (b) the mean molar mass M of the given mixture which enters its equation of state pV = (m/M) RT, where m is the mass of the mixture. |
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124 | Liquefaction can be viewed as an extreme deviation from ideal gas behavior A. True B. False |
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125 | Q.29 Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased? |
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126 | Under similar conditions, which of the following gas will have same value of ( mu_{r m s} ) as ( C O_{2} ? ) A. ( N O ) в. ( C_{3} H_{8} ) ( c cdot c o ) D. ( N_{2} ) |
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127 | A plot of ( boldsymbol{P} boldsymbol{v} boldsymbol{s} boldsymbol{T} ) for a given mass of gas of constant volume is a straight line. P ( boldsymbol{v} boldsymbol{s} boldsymbol{T} ) at constant volumes ( boldsymbol{V}_{1} ) and ( boldsymbol{V}_{2} ) for an ideal gas are shown below: Which of the following is correct? ( A cdot V_{1}>V_{2} ) B. ( V_{1}<V_{2} ) ( mathbf{c} cdot V_{1}=V_{2} ) D. ( V_{1}=2 V_{2} ) |
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128 | Q. 18 If 1 g of each of the following gases are taken at STP, which of the gases will occupy (a) greatest volume and (b) smallest volume? CO, H2O, CH, NO |
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129 | A certain mass of a gas occupies a volume of ( 0.2 mathrm{dm}^{3} ) at ( 273 mathrm{K} ). Calculate the volume of the gas if its absolute temperature is doubled at the same pressure. |
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130 | Large volumes of C.N.G is available in small cylinders due to its property of A. high density B. low density c. high compressibility D. easy availability |
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131 | The existence of the states of matter is due to A. necessity of defining the three states B. variation in the characteristics particles of matter C. All of the above D. None of the above |
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132 | Which of the following would increase the average speed the ideal gas molecules? A. Lowering the temperature of gas B. Compressing the gas with piston c. Expanding the gas into vacuum D. Heating the system at constant volume and pressure |
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133 | Assertion The gas is heated, if its temperature is less than its inversion temperature in Joule-Thomson effect. Reason Heating effect in gas is noticed during Joule-Thomson effect when ( boldsymbol{T}>boldsymbol{T}_{i} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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134 | Exactly ( 100 mathrm{m} L ) of oxygen is collected over the water of ( 23^{circ} mathrm{C} ) and ( 800 mathrm{mm} ) pressure. Calculate the approximate value of the volume of dry oxygen at NTP. (as nearest integer) [Vapour pressure of water at ( 23^{circ} mathrm{C} ) is 21 ( m m ) |
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135 | At constant temperature ( N_{2} ) gas of 200 ( mathrm{cm} ) at ( 720 mathrm{mm} ) pressure and ( O_{2} ) gas of ( 400 mathrm{cm}^{3} ) at ( 750 mathrm{mm} ) pressure. These are mixed in 1 ltr capacity flask, than what will be the final pressure. ( A cdot 111 mathrm{mm} ) B. 222 mm c. ( 333 mathrm{mm} ) D. 444 mm |
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136 | Select the correct statement ( (s) ) A. The velocity at which distribution of molecules is maximum is called most probable velocity B. Most probable velocity of a gas is larger than root mean square velocity C. Both (a) and (b) D. None of above is correct |
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137 | Which of the following best accounts for some of the non-ideal behavior observed in real gases? A. Some gaseous molecules are not spherical B. There are intermolecular attractive forces c. The temperature is not kept constant D. ( R ) (gas constant) is not a true constant E. Experimental errors are made in the measurement of the pressure and the volume |
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138 | A vessel of ( 5.0 l ) capacity contains ( 1.4 g ) nitrogen at ( 1800 mathrm{K} ). Assuming that at this temperature, ( 40 % ) of molecules are dissociated into atoms and the gas is ideal, what is the gas pressure? A .2 .07 atm B. 1.476 atm c. 1.05 atm D. 2.67 atm |
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139 | A sealed gas cylinder is left outside on a hot, sunny day. What happens to the average speed of the gas molecules and to the pressure of the gas in the cylinder as the temperature of the gas rises? Average speed of ( quad ) Pressure of gas gas molecules ( quad ) in cylinder Decreases Decreases Increases Decreases |
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140 | Which of the following states of matter are called fluids? A. Solid, Gas B. Solid, Liquid c. Liquid, Gas D. Solid, Liquid, Gas |
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141 | ( C O_{2} ) gas below ( 31.2^{circ} C ) is called as: A ( cdot C O_{2} ) vapours B. ( C O_{2} ) gas c. ( C O_{2} ) liquid D. none of these |
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142 | The rms velocity of hydrogen is ( sqrt{7} ) times the rms velocity nitrogen. If ( boldsymbol{T} ) is the temperature of the gas. ( mathbf{A} cdot Tleft(H_{2}right)=Tleft(N_{2}right) ) B . ( Tleft(H_{2}right)>Tleft(N_{2}right) ) c. ( Tleft(H_{2}right)<Tleft(N_{2}right) ) D. ( Tleft(H_{2}right)=sqrt{7} Tleft(N_{2}right) ) |
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143 | Q2. Define boiling point of a liquid. | 11 |

144 | Using the equation of state ( boldsymbol{p} boldsymbol{V}=boldsymbol{n} boldsymbol{R} boldsymbol{T} ) show that, at a given temperature the density of a gas is proportional to its gas pressure ( boldsymbol{p} ) |
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145 | 4. The equation of state for real gas is given by P + x(v-b)=RT. The dimensions of the constant (IIT JEE, 1997) a are |
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146 | A vessel of uniform cross-section of length ( 500 mathrm{cm} ) as shown in figure is divided in two parts by a weightless ( & ) frictionless piston. One part contains 5 mole of ( N_{2}(g) ) and other part contains 2 moles of ( boldsymbol{H}_{2}(boldsymbol{g}) & 1 ) mole of ( boldsymbol{H} boldsymbol{e}(boldsymbol{g}) ) gaseous mixture at the same temperature and pressure. What is the length of ( N_{2} ) compartment? (Assume volume of piston to be engligible) A. ( 187.5 mathrm{cm} ) B. 300 ( c m ) c. ( 312.5 mathrm{cm} ) D. none of these |
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147 | Kinetic energy of 1 mole of an ideal gas is: ( ^{mathbf{A}} cdot frac{3}{2}^{R T} ) в. ( frac{3}{2}^{K T} ) c. ( frac{R T}{2} ) D. ( frac{2 R}{3} ) |
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148 | Moon has no atmosphere because: A. it is far away from the surface of the earth B. its surface temperature is ( 10^{0} C ) C. the ( r m s ) velocity of all the gas molecules is more then the escape velocity of the moon’s surface D. the escape velocity of the moon’s surface is more than the ( r m s ) velocity of all molecules |
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149 | A mixture of hydrogen and helium is prepared such that the number of wall collisions per unit time by molecules of each gas is the same. Which gas has the higher concentration? A. Helium B. Hydrogen c. Both have same concentration D. None of these |
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150 | Which of the following is a representation of Gay-Lussac’s law? A ( cdot P_{1} T_{1}=P_{2} T_{2} ) B . ( P_{1} T_{2}=P_{2} T_{1} ) c. ( P_{1} V_{1}=P_{2} V_{2} ) D. ( V_{1} T_{2}=V_{2} T_{1} ) |
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151 | Different states of same substance are due to the difference in A. temperature B. pressure c. either temperature or pressure D. none of the above |
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152 | Boyle’s law may be expressed as: This question has multiple correct options ( mathbf{A} cdot(d P / d V)_{T}=K / V ) ( mathbf{B} cdot(d P / d V)_{T}=-K / V^{2} ) ( mathbf{c} cdot(d P / d V)_{T}=-K / V ) D. ( V propto 1 / P ) |
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153 | Assertion The plot of volume ( (V) $ ) versus pressure ( (P) ) at constant temperature is a hyperbola in the first quadrant. Reason ( boldsymbol{V} propto mathbf{1} / boldsymbol{P} ) at constant temperature A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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154 | Which of the following molecular interactions include not only London dispersion forces but also dipole-dipole interaction? A ( cdot P F_{3}(l) ) в. ( B F_{3}(l) ) c. ( operatorname{LaF}_{3}(l) ) D. ( operatorname{sif}_{4}(l) ) |
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155 | The volume occupied by the molecules of an ideal gas is: | 11 |

156 | Under what condition real gases obey ideal gas behaviour? | 11 |

157 | ILLUSTRATION 14.1 (a) Calculate (i) root-mean-square speed and (ii) the mean energy of 1 mol of hydrogen at STP (given that density of hydrogen is 0.09 kg /mº). (b) Given that the mass of a molecule of hydrogen is 3.34 X 10-2 kg, calculate Avogadro’s number. (c) Calculate Boltzmann’s constant. |
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158 | The volume of ( H C l ) passed through the solution at ( 25^{circ} mathrm{C} ) and 1 atm is: A. ( 24.46 m L ) B. ( 2.446 m L ) c. ( 244.6 m L ) D. ( 0.2446 m L ) |
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159 | ( 5 g ) of unknown gas has pressure ( P ) at a temperature ( boldsymbol{T} boldsymbol{K} ) in a vessel. On increasing the temperature by ( 50^{circ} mathrm{C}, 1 mathrm{g} ) of the gas was given out to maintain the pressure ( boldsymbol{P} ). The original temperature was: A . ( 73 K ) в. ( 100 K ) c . ( 200 K ) D. none of these |
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160 | At critical temperature of a liquid, surface tension is: A . zero B. infinite c. varies liquid to liquid D. can’t be measured |
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161 | An open flask contains air at ( 27^{circ} mathrm{C} ). At what temperature should it be heated so that ( 1 / 3 r d ) of air present in it goes out? A ( cdot 177^{circ} mathrm{C} ) B. ( 100^{circ} mathrm{C} ) ( mathbf{c} cdot 300^{circ} mathrm{C} ) D. ( 150^{circ} mathrm{C} ) |
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162 | A vessel of volume 5 litre contains ( 1.4 g ) of nitrogen at a temperature ( 1800 K ) The pressure of the gas if ( 30 % ) of its molecules are dissociated into atoms at this temperature is : A. 4.05 atm B. 2.025 atm c. 3.84 atm D. 1.92 atm |
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163 | Which of the following statements are incorrect: This question has multiple correct options A. Molar volume of every gas at STP is ( 22.4 mathrm{L} ) B. Under critical states compressibility factor is 1 C. All gases will have equal value of average ( mathrm{KE} ) at a given temperature D. At absolute zero, KE is 3/2 R |
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164 | At what temperature will the rms speed of hydrogen be the same as that of oxygen at ( 25^{circ} mathrm{C} ? ) |
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165 | Q2. What are ideal and real gases? Out of Co, and NH, gases, which is expected to show more deviation from the ideal gas behaviour? . |
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166 | At any particular time, different particles in the gas: A. have same speed and kinetic energy B. have same speed but different kinetic energies c. have different speeds but same kinetic energy D. have different speeds and hence different kinetic energies |
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167 | A gas occupies volume of ( 0.35 d m^{3} ) at ( 290 mathrm{K} ) and ( 92.458 mathrm{K} mathrm{Nm}^{-2} ) pressure. Calculate the volume of gas at STP (Ans ( left.0.3 d m^{3}right) ) |
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168 | Q.9 What is SI unit of viscosity coefficient (n)? (a) Pascal (b) Nsm? – (c) km² s (d) Nm 2 |
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169 | fone mole of an ideal gas ( left(gamma=frac{4}{3}right) ) is expanded reversibly and adiabatically from ( 800 mathrm{K} ) to ( 200 mathrm{K}, ) which of the following statement’s are correct? This question has multiple correct options A. ratio of final volume to initial volume is 64 B. ratio of final pressure to initial pressure is ( frac{1}{256} ) c. ratio of final volume to initial volume is 32 D. ratio of final pressure to initial pressure is ( frac{1}{16} ) |
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170 | The following graph illustrates: A. Dalton’s law B. Charles’law c. Boyle’s law D. Gay-Lussac’s law |
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171 | Q. 48 Assertion (A) At critical temperature liquid passes into 9 imperceptibly and continuously. il temperature liquid passes into gaseous state Reason (R) The density of liquid and gaseous phase is equat com temperature. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true |
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172 | Assertion Liquefication of a gas is a continuous process with increase in pressure below ( boldsymbol{T}_{boldsymbol{c}} ) Reason Liquefication of a gas is a discontinuous process with increase in pressure below ( boldsymbol{T}_{boldsymbol{c}} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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173 | The ( R M S ) velocity of an ideal gas at ( 27^{0} C ) is ( 0.3 m / )sec. Its ( R M S ) velocity at ( 927^{circ} mathrm{C} ) is : A. ( 6 mathrm{m} / mathrm{sec} ) в. ( 0.3 mathrm{m} / mathrm{sec} ) c. ( 0.6 m / s e c ) D. 3 ( m / )sec |
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174 | Water boils when: A. saturated vapour pressure of water becomes equal to the atmospheric pressure B. boiling point of water becomes more than atmospheric pressure C . saturated vapour pressure of water is less than atmospheric pressure D. vapour pressure of water becomes more than atmospheric pressure |
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175 | State whether the statement is true or false: At constant temperature and pressure |
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176 | Identify the correct labels of ( A, B ) and ( C ) in the following graph from the options given below: Ref. image Root mean square speed ( left(V_{r m s}right) ; ) most probable speed ( left(V_{m p}right) ; ) Average speed ( left(V_{a v}right) ) A ( cdot A-V_{m p} ; B-V_{a v} ; C-V_{r m s} ) B . ( A-V_{m p} ; B-V_{r m s} ; C-V_{a v} ) c. ( A-V_{a v} ; B-V_{r m s} ; C-V_{m p} ) D. ( A-V_{r m s} ; B-V_{m p} ; C-V_{a v} ) |
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177 | 2.4 Assertion (A) Gases do not liquefy above their critical temperature, even on applying high pressure. Reason (R) Above critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed. (a) Both A and Rare true and R is the correct explanation of A (b) Both A and R are true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true |
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178 | The free path of a gas molecule is the distance through which a molecule moves: A. Between the two opposite walls of the container B. In one second c. Between two successive collisions D. None of these |
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179 | Which of the following gas is used in vehicles? A. L.P.G. B. C.N.G c. Nitrogen D. Nitrogen dioxide |
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180 | At ( 27^{0} C ) if temperature of 1 mol of gas is increased by ( 50^{0} C ) the ( % ) change in kinetic energy of system is: A . 16.67 B. 18.57 c. 85.18 D. 7.66 |
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181 | When we inflate cycle tubes, the volume of tube as well as the pressure of air inside tube increases A. It is an exceptional case of Boyle’s Las B. It happens because air is not ideal gas c. It happens because mass of air is not constant D. It happens because external force is applied in inflating the tubes |
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182 | A balloon is filled with hydrogen at room temperature. It will burst if pressure exceeds 0.2 bar If at 1 bar pressure the gas occupies ( 22.7 mathrm{L} ) volume up to what volume can the balloon be expanded? |
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183 | Q. 35 The relation between pressure exerted by an ideal gas (Pideal) and observed pressure (pro) is given by the equation, an? – Preal & Pideal = Preal + 72 (i) If pressure is taken in Nm-2, number of moles in mol and volume in m calculate the unit of’a’. (ii) What will be the unit of ‘d’ when pressure is in atmosphere and volume in dm? |
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184 | Q6. What do you understand by laminar flow of a liquid? | 11 |

185 | Both of the gas samples represented above are at the same temperature and pressure. The mass of ( boldsymbol{H}_{2} ) in the one liter container is 0.20 gram. The mass of ( X ) in the two-liter container is 8 grams. The molecular weight of ( boldsymbol{X} ) is : A. ( 10 mathrm{g} / mathrm{mol} ) B. 20 g/mol c. 40 g/mol D. ( 60 g / ) mol E . 80 g/mol |
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186 | 0.11 Which curve in figure represents the curve of ideal gas: CA pV- (a) Only B (b) C and D C ) E and F (d) A and B |
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187 | The coefficient of thermal expansion, ( alpha ) is nearly constant for a liquid ( boldsymbol{alpha}= ) ( frac{1}{V}left(frac{d V}{d T}right)_{P} ) At ( 293 K ) and ( 1 a t m ) for water ( alpha= ) ( 2.1 K^{-1} ) What is the approximate work done when 1 mole of liquid is heated from ( 288 K ) to ( 298 K ) at 1 at ( m ) (Molar volume of liquid ( =18 m l ) )? A. ( -78.25 k J ) в. ( 78.15 J ) c. ( -37.8 J ) D. ( -83.14 J ) |
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188 | A jar contains 30 mL of glycerine (whose mass is37.8 ( g ) ) and 60 mL of corn syrup (whose mass is ( 82.8 mathrm{g} ) ). Which liquid is on top? Show your work, and explain your answer. A. glycerine B. syrup ( c . ) a and ( b ) D. none of these |
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189 | The temperature at which the ( boldsymbol{R} boldsymbol{M} boldsymbol{S} ) velocity of ( C O_{2} ) is equal to the RMS velocity of ( N_{2} O ) at ( 27^{circ} C ) is: ( mathbf{A} cdot 0^{circ} C ) В. ( 27^{circ} mathrm{C} ) ( mathrm{c} cdot 273^{circ} mathrm{C} ) D. ( -273^{circ} mathrm{C} ) |
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190 | Which substance is wrongly paired with the bonding found between the molecules of that substance? ( mathbf{A} cdot N H_{3}- ) hydrogen bonding B. ( F_{2} ) -van der waals (dispersion) forces c. ( H C l ) – dipoles D. ( C H_{4} ) – dipoles E . ( N a C l(a q) ) – molecule-ion attraction |
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191 | 0.20 The behaviour of matter in different states is governed by various physical laws. According to you, what are the factors that determine the state of matter? L istent |
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192 | Which of the following statements is wrong? A. Mean free path varies inversely with the number of molecules per unit volume of gas. B. The time spent during a collision is appreciable and attraction among molecules give rise to force. C. Mean free path is independent of the temperature or pressure in a sample of gas in a container of fixed volume D. If ( lambda ) is mean free path, the ( lambda propto T ) at constant ( P ) and ( lambda propto ) ( frac{1}{P} ) at constant ( T ) |
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193 | The temperature at which ( R M S ) velocity of ( boldsymbol{O}_{2} ) is equal to the ( boldsymbol{R} boldsymbol{M} boldsymbol{S} ) velocity of ( S O_{2} ) at ( 327^{circ} C ) is: A. ( 273 K ) в. ( 300 K ) ( mathbf{c} cdot 100^{0} C ) D. ( 1200 K ) |
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194 | At what temperature will he atom have the same ( r m s ) speed as ( H_{2} ) molecules have at ( 27^{0} C ) ? A ( cdot 127^{0} C ) в. ( 227^{circ} mathrm{C} ) c. ( 327^{circ} mathrm{C} ) D. ( 27^{0} C ) |
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195 | At what temperature in ( ^{circ} boldsymbol{C}, ) the ( boldsymbol{U}_{r m s} ) of ( boldsymbol{S} boldsymbol{O}_{2} ) is equal to the average velocity of ( O_{2} ) at ( 27^{circ} C ? ) A ( cdot 118.1^{circ} mathrm{C} ) B . ( 236.3^{circ} mathrm{C} ) C ( .472 .6^{circ} mathrm{C} ) D. None of these |
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196 | A balloon of diameter 21 meter weight ( 100 k g . ) Calculate its pay-load, if it is filled with ( H e ) at 1.0 atm and ( 27^{circ} mathrm{C} ). Density of air is ( 1.2 mathrm{kgm}^{-3} ). (Given: ( R= ) ( left.0.082 L a t m K^{-1} m o l^{-1}right) ) A. ( 4952.42 mathrm{kg} ) B. 4932.42 kg c. ( 493.242 mathrm{kg} ) D. None of these |
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197 | Assertion Gaseous molecules are assumed to be point masses’ occupying no volume. Reason Gaseous molecules suffer no energy |
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198 | ( 4.4 C O_{2} ) gas and 2.24 litre of ( H_{2} ) gas at S.T.P are taken in a 1 litre container at 27. The total pressure of gases in container will be ? ( A cdot 4.926 ) atm B. 3743.76 mm of Hg c. ( 1871.88 mathrm{mm} ) of ( mathrm{Hg} ) D. 2.463 atm |
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199 | In which of the following mixtures, the London dispersion force is acting as major intermolecular force of attraction? A. Sodium chloride and water B. Cyclohexane and carbon tetrachloride c. water and ethyl alcohol D. Benzene and acetone |
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200 | Which of the following is a characteristic of matter? A. Particles are very small in size. B. Particles have space among them c. Particles posses kinetic energy D. All of above |
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201 | Equal masses of ( H_{2^{prime}} O_{2} ) and methane have been take in a contaier of volume at temperature ( 27^{circ} mathrm{C} ) in identical conditions. the ratio of the volume of ( operatorname{gases} H_{2}: O_{2}: ) methane would be: A. 8: 16: 1 B . 16: 8: 1 c. 16: 1: 2 D. 8: 1: 2 |
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202 | All kind of matter is made up of extremely small particles called ( A ). atom B. molecule ( c cdot ) ion D. compound |
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203 | Calculate the total pressure of a mixture of 8 g of oxygen and 4 g of hydrogen confined in vessel of ( 1 d m^{3} ) at ( 27^{0} C ) ( left(boldsymbol{R}=mathbf{0 . 0 8 3} quad text { bar } quad boldsymbol{d m}^{3} boldsymbol{k}^{-1} boldsymbol{m o l}^{-1}right) ) |
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204 | Мос 1. A vessel of volume V = 301 contains ideal gas at the temperature 0°C. After a portion of the gas has been let out, the pressure in the vessel decreased by Ap = 0.78 atm (the temperature remaining constant). Find the mass of the released gas. The gas density under the normal conditions p = 1.3 gl. |
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205 | At what centigrade temperature will a given volume of a gas at ( 0^{circ} mathrm{C} ) becomes double if pressure remains constant? ( mathbf{A} cdot 546^{circ} mathrm{C} ) B . ( 200^{circ} mathrm{C} ) ( c cdot 273^{circ} mathrm{C} ) D. ( 320^{circ} mathrm{C} ) |
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206 | 38. Draw the approximate plots of isochoric, isobaric, isothermal, and adiabatic processes for the case of an ideal gas, using the following variables: (a) p, T; (b) V, T. |
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207 | The temperature at which ( mathbf{H}_{2} ) has same rms speed (at 1 atm) as that of ( mathrm{O}_{2} ) at NTP is: A. 37 k B. 17 K c. ( 512 mathrm{k} ) D. 27 K |
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208 | Choose the correct statement from the following: This question has multiple correct options A. Molecular collisions are unaffected by gravity B. Real gases obey gas laws under any conditions C. Gas laws have no significance at absolute zero D. At ( 0^{circ} mathrm{C} ), the molecular motion ceases. |
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209 | Consider a gas with density ( rho ) and ( C ) as the root mean square velocity of its molecules contained in a volume. If the system moves as a whole with velocity then the pressure exerted by the gas is : ( mathbf{A} cdot frac{1}{3} rho C^{2} ) B ( cdot frac{1}{3} rho(C+v)^{2} ) c. ( frac{1}{3} rho(C-v)^{2} ) D ( cdot frac{1}{3} rholeft(C^{2}-v^{2}right) ) |
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210 | Consider an ideal gas contained in a vessel. If the intermolecular interaction suddenly begins to act, which of the following will happen: A. the observed pressure decreases B. the observed pressure increases c. the observed pressure remains same D. none of these |
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211 | I: Physical properties of ice, water, and steam are very different. 2: Chemical composition of water is different in all three states. Explain. A . only 1 is true B. only 2 is true c. both are true D. both are false |
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212 | The boiling point of alkyl halide are higher than those of corresponding alkanes because of: A. dipole-dipole interaction B. dipole-induced dipole interaction c. ( H ) -bonding D. none of the above |
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213 | State True or False. A gas differs from a liquid in that, except during collisions, the molecules of gas are widely separated from each other and move in paths that are largely unaffected by intermolecular force. A. True B. False |
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214 | State True or False. Except ( boldsymbol{H}_{2} ) and ( boldsymbol{H} boldsymbol{e}, ) intermolecular attractions have longer range than repulsions. A. True B. False |
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215 | Q. 15 Which of the following figures does not represent 1 mole of dioxygen gas at STP? (a) 16 g of gas (b) 22.7 L of gas (c) 6.022 x 1023 dioxygen molecules (d) 11.2 L of gas |
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216 | Which shows increasing the kinetic energy of a liquid? [ | underbrace{x} ] ( mathbf{A} cdot A B ) в. ( B C ) c. ( C D ) D. ( D E ) E . ( E F ) |
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217 | Match the columns (Gases) (Behaviour) |
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218 | PA 2P. Ро В 78. n moles of an ideal gas undergoes a process A → B as shown in figure. Maximum temperature of the gas during the process is: (a) 3P.V. (h) 9P.V. 2nR 9P.V. 2nR nR 4nR V. 2V 9P.V |
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219 | Two closed vessel ( A ) and ( B ) of equal volume containing air at pressure ( boldsymbol{P}_{1} ) and temperature ( T_{1} ) are connected to each other through a narrow open tube. If the temperature of one is now maintained at ( T_{1} ) and other at ( T_{2} ) (where ( left.T_{1}>T_{2}right) ) then that what will be the final pressure? A ( cdot frac{T_{1}}{2 P_{1} T_{2}} ) В. ( frac{2 P_{1} T_{2}}{T_{1}+T_{2}} ) ( mathbf{c} cdot frac{2 P_{1} T_{1}}{T_{1}-T_{2}} ) D. ( frac{2 P_{1}}{T_{1}+T_{2}} ) |
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220 | Critical temperature and pressure of a real gas is ( 27^{circ} C & 150 ) atm respectively The critical volume of 1 mole of real gas is : A . 0.12 B. 0.24 ( c .0 .50 ) D. None |
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221 | An ideal gas as compared to a real gas at very high pressure occupies: A. more volume B. less volume c. same volume D. unpredictable behaviour |
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222 | The large volume of gas can be filled in a small cylinder owing to its high A. resitivity B. compressibility c. pressure D. boiling point |
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223 | ( C O_{2} ) and ( C H_{4} ) have critical temperatures of ( 304 mathrm{K} ) and ( 190 mathrm{K} ) respectively. ( P_{C} ) for ( C O_{2}=72 ) atm and ( P_{C} ) for ( C H_{4}=45 ) atm. The ratio ( b_{C O_{2}}: ) ( b_{C H_{4}} ) is? A .2: 3 B. 1: 1 ( c cdot 2: 1 ) D. 3: 2 |
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224 | Two flasks of equal volume are connected by a narrow tube (of negligible volume) all at ( 27^{0} mathrm{C} ) and contain 0.70 mole of ( H_{2} ) at 0.5 atm. One of the flask is then immersed into a bath kept at ( 127^{0} mathrm{C} ), while the other remains at ( 27^{0} mathrm{C} ). The final pressure in each flask is : A. Final pressure ( =0.5714 ) atm B. Final pressure = 1.5714 atm C. Final pressure ( =0.5824 mathrm{atm} ) D. None of these |
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225 | what is the deviation factor for ideal gas? A . 1.0 B. 2.0 c. 1.9 D. 0.9 |
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226 | State True or False. The diameter of molecules are much smaller than the average distance travelled between collisions. A. True B. False |
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227 | A liquid disturbed by stirring comes to rest after sometime due to its property of A. compressibility B. diffusion c. viscosity D. all of these |
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228 | Boyle’s law states that: A. ( V propto T ) at constant pressure. B. ( P propto T ) at constant volume. ( ^{mathrm{C}} P propto frac{1}{V} ) at constant temperature D. None of these. |
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229 | 8 directions and collide with each other and with the wall of the container. It is difficult to determine the speed of an individual molecule but it has become possible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution. Consider the following graph about |
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230 | An open vessel at ( 27^{circ} C ) is heated until the three-fourths mass of the air in it has been expelled. Neglecting the expansion of the vessel, find the temperature to which the vessel has been heated. A ( cdot T_{2}=723^{circ} mathrm{C} ) В . ( T_{2}=958^{circ} mathrm{C} ) c. ( T_{2}=927^{circ} mathrm{C} ) D. None of these |
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231 | Q4. The values of the van der Waal’s constants for a gas are a = 4.10 dm bar mol- and b= 0.035 dmr mol-. Calculate the values of the critical temperature and critical pressure for the gas. |
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232 | Thermal conduction takes place in A. solid, liquid B. liquid, gas c. gas, solid D. solid, liquid, gas |
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233 | A gas occupies a volume of ( 250 mathrm{ml} ) at ( 745 mathrm{mm} mathrm{Hg} ) and ( 25^{circ} mathrm{C} . ) What additional pressure is required to reduce the gas volume to ( 200 mathrm{ml} ) at the same time? ( mathbf{A} cdot 180.25 mathrm{mm} ) B. ( 200.9 mathrm{mm} ) c. ( 186.25 mathrm{mm} ) D. ( 189.4 mathrm{mm} ) |
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234 | Given ( 300.0 mathrm{mL} ) of a gas at ( 17^{0} mathrm{C} ). What is its volume at ( 10^{0} ) C? |
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235 | Consider a sample of an equimolar mixture of He gas and Ne gas both at ( 300 mathrm{K} ) and 1 atmosphere.Assuming ideal behaviour which of the following quantities are equal for two samples? This question has multiple correct options A. Root mean square speed of molecules B. Mean translational kinetic energy of molecules c. Number density of molecules D. Kinetic energy of molecules |
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236 | Q. 19 Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states? |
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237 | 10. Which of the following volume (V), temperature (T) plots represents the behaviour of one mole of an ideal gas at one atmosphere? V(L) (38.8 L, 373 K) (22.4 L, (a) 273 K) T(K) V(L) 4 (28.6 L, 373 K) (22.4 L, (b) 273 K) OF T(K) | (30.6 L, 373 K) (22.4L, (c) 273 K) T(K) V(L)4 T (14.2 L, 373 K) (22.4L, (d) 273 K) T(K) |
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238 | The critical temperature is the temperature: A. below which the gas undergoes cooling when expanded into vacuum B. at which a gas liquefies at 1 at ( m ) C. at which the average kinetic energy of the molecules is ( operatorname{minimum} ) D. above which the gas cannot be liquefied how so ever high pressure may be applied |
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239 | Q. 23 A gas that follows Boyle’s law, Charle’s law and Avogadros law an ideal gas. Under what conditions a real qas would behave ideally: |
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240 | The average velocity of an ideal gas molecule at ( 27^{circ} C ) is ( 0.3 m / ) sec. The average velocity at ( 927^{circ} mathrm{C} ) will be: A. ( 0.6 m / s e c ) в. ( 0.3 m / )sec ( mathbf{c} cdot 0.9 m / )sec D. ( 3.0 m / s e c ) |
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241 | A mixture in which the mole ratio of ( boldsymbol{H}_{2} ) and ( O_{2} ) is 2: 1 is used to prepare water by the reaction: ( mathbf{2} boldsymbol{H}_{mathbf{2}}(boldsymbol{g})+boldsymbol{O}_{mathbf{2}}(boldsymbol{g}) rightarrow mathbf{2} boldsymbol{H}_{mathbf{2}}(boldsymbol{g}) boldsymbol{O} ) The total pressure in the container is ( 0.8 operatorname{atm} ) at ( 20^{circ} mathrm{C} ) before the reaction. The final pressure (in atm) at ( 120^{circ} mathrm{C} ) after the reaction, assuming ( 80 % ) yield of water is (as nearest integer): |
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242 | If the gas particles in a rigid container slow down, what will happen to the pressure inside the container? A. Pressure will increase B. Pressure will decrease c. Pressure will oscillate D. Pressure will not change |
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243 | The density of a gas at ( 27^{circ} C ) and 1 atm is ‘d’. Pressure remaining constant, the temperature at which its density becomes 0.75 d is : A ( cdot 20^{circ} mathrm{C} ) B. ( 30^{circ} mathrm{C} ) ( c cdot 400 k ) D. 300k |
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244 | Statement I: In the kinetic theory of gases, collisions between gas particles and the walls of the container are considered elastic. Statement II: Gas molecules are |
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245 | Particles move randomly in A. nitrogen B. sugar ( c . ) ice D. water |
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246 | Assertion Vapor in its natural state is a solid or liquid at room temperature. Reason Gas in its natural state at room temperature would still be a gas. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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247 | At ( 100^{circ} mathrm{C} ) and 1 atm, if the density of liquid water is ( 1.0 g c m^{-3} ) and that of water vapour is ( 0.0006 g mathrm{cm}^{-3}, ) then the volume occupied by water molecules in one litre of steam at that temperature is : ( mathbf{A} cdot 6 mathrm{cm}^{3} ) B. ( 60 mathrm{cm}^{3} ) ( mathrm{c} cdot 0.6 mathrm{cm}^{3} ) D. ( 0.06 mathrm{cm}^{3} ) |
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248 | According to Charles’ law. This question has multiple correct options A ( cdot V propto frac{1}{T} ) ( ^{mathbf{B}} cdotleft(frac{d V}{d T}right)_{P}=K ) ( ^{mathbf{C}} cdotleft(frac{d T}{d V}right)_{P}=K ) ( ^{mathrm{D}}left(frac{1}{T}-frac{V}{T^{2}}right)_{P}=0 ) |
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249 | Real gases behave ideally at: A. Low pressure, high temperature B. Low pressure, low temperature C. High pressure, low temperature D. None of these |
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250 | Match the following substances with types of inter molecular forces: List-I List-II a) ( C H_{4} ) i) London, dipole-dipole ( b ) ii) London [ C H C l_{3} ] ( c ) iii) London, dipole-dipole, hydrogen [ C_{4} H_{9} O H quad text { bonding. } ] A . a-ii, b-i, c-iii B. a-i, b-ii, c-iii c. a-iii, b-i, c-ii D. a-iii, b-ii, c- |
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251 | What is the effect on chemical and physical properties of water when temperature is changed? A. Chemical properties of water remain same but the physical state changes with change in temperature B. Chemical properties of water change with change in temperature but physical properties remain same C. There is no effect on chemical or physical properties of water when temperature is changed D. Both chemical and physical properties of water change with change in temperature |
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252 | The equation of state for a certain gas is ( P=frac{R T}{V_{m}-b}-frac{a}{V_{m}}, ) where a and b are constants distinct from zero. Ascertain whether the gas has a critical point or not. Answer as 1 if the gas has critical point and as ( 2, ) if no critical point. |
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253 | Write any three postulates of Kinetic theory of gases. | 11 |

254 | Q Type your question IOr ( 1.00 times 10 ). ( kappa g ) or oxygen gas at two different temperatures. (a) What does the dotted plot signify? (b) Which is true ( : T_{1}>T_{2} ) or ( T_{1}<T_{2} ? ) (c) What is the value of PV / T where the curves meet on the y-axis? (d) If we obtained similar plots for ( 1.00 times 10^{-3} k g ) of hydrogen, would we get the same value of PV/T at the point where the curves meet on the y-axis? If not, what mass of hydrogen yields the same value of PV/T (for low pressure high temperature region of the plot)? (Molecular mass of ( boldsymbol{H}_{2}=mathbf{2 . 0 2} boldsymbol{u}, ) of ( O_{2}=32.0 u, R=8.31 J m o l^{-1} K^{-1} . ) |
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255 | Which of the following behaviour is true regarding the coefficient of viscosity ( (eta) ) of a liquid? A. Plot of ( eta ) versus ( T ) is linear B. Plot of ( eta ) versus ( frac{1}{T} ) is linear c. ( eta=frac{E}{R T} ) D. Plot log of ( eta ) versus ( frac{1}{T} ) is linear |
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256 | Q3. What is SI unit of (i) Viscosity (ii) Surface tension? | 11 |

257 | If helium and methane are allowed to diffuse out of the container under the similar conditions of temperature and pressure, then the ration of rate of diffusion of helium to methane is: A . 2. B. 1.0 ( c cdot 0.5 ) D. 4.0 |
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258 | Match the items of List 1 with those in List 2 |
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259 | A mixture of ethane ( left(C_{2} H_{6}right) ) and ethene ( left(C_{2} H_{4}right) ) occupies 40 litre at 1.00 atm and at ( 400 mathrm{K} ). The mixture reacts completely with 130 g of ( O_{2} ) to produce ( C O_{2} ) and ( H_{2} O . ) Assuming ideal gas behaviour, calculate the mole fractions of ( C_{2} H_{6} ) in the mixture and write numerical value (upto 2 digit only) after decimal point only (as for 0.19, write 19). |
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260 | 09. Define critical temperature of gas. | 11 |

261 | The molecular weight of ( O_{2} ) and ( N_{2} ) are 32 and 28 respectively. At ( 15^{0} C ), the pressure of ( 1 mathrm{gm} mathrm{O}_{2} ) will be the same as that of ( 1 mathrm{gm} N_{2} ) in the same bottle at the temperature? A . ( -21^{0} C ) B. ( -13^{0} C ) ( mathbf{c} cdot 15^{0} C ) D. ( 56.4^{0} V ) |
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262 | OWS are a Q. 10 Atmospheric pressures recorded in different Cities Shimla Bangalore Delhi pin N/m2 101x 10- 12 x 105 102 x 105 Mumbai 121x 10′ Consider the above data and mark the place at which liquid will boil first. (a) Shimla (b) Bangalore (c) Delhi (d) Mumbai |
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263 | To which of the following mixtures Dalton’s law is not applicable? This question has multiple correct options A ( cdot C O_{2} ) and ( operatorname{co~at~room~temperature~} ) B. Ammonia and hydrogen chloride at room temperature ( mathrm{c} cdot N H_{3} ) and steam at room temperature D. He and ( H_{2} ) |
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264 | Charles’s law is represented mathematically as (symbols have their usual meanings) ( mathbf{A} cdot V_{t}=K V_{o} t ) в. ( v_{A}=frac{K V_{o}}{t} ) c. ( v_{t}=V_{o}left(1+frac{273}{t}right) ) D. ( V_{t}=V_{o}left(1+frac{t}{273}right) ) |
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265 | Which of the following statement is incorrect? ( mathbf{A} cdot R M S ) velocity depends on the molecular weight of the gas B. ( R M S ) velocity depends on temperature of the gas C . ( R M S ) velocity depends on the number of molecules present in unit volume D. ( R M S ) velocity is greater than average velocity and most probable velocity. |
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266 | The value of Boltzmann constant is: (in erg ( boldsymbol{K}^{-1} ) molecule ( ^{-1} ) ) A ( cdot 1.38 times 10^{-16} ) B . ( 1.38 times 10^{-23} ) c. ( 8.314 times 10^{7} ) D. ( 6.023 times 10^{-16} ) |
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267 | For a gas deviation from ideal behaviour is maximum at: ( mathbf{A} cdot 0^{0} C ) and ( 1.0 a t m ) B. ( 100^{circ} mathrm{C} ) and 2.0 atm c. ( -13^{0} mathrm{C} ) and 1.0 atm D. ( -13^{0} C ) and 2.0 atm |
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268 | Three gases ( A, B ) and ( C ) are at same temperature if their r.m.s speed are in the ratio ( 1: frac{1}{sqrt{2}}: frac{1}{sqrt{3}} ) then their molar masses will be in the ratio: A .1: 2: 3 B. 3: 2: 1 c. ( 1: sqrt{2}: sqrt{3} ) D. ( sqrt{3}: sqrt{2}: 1 ) |
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269 | The rms speed of hydrogen is ( sqrt{7} ) times the rms speed of nitrogen. If T is the temperature of the gas, then: ( mathbf{A} cdot T_{H_{2}}=T_{N_{2}} ) B ( cdot T_{H_{2}}>T_{N_{2}} ) ( mathbf{c} cdot T_{H_{2}}<T_{N_{2}} ) D. ( T_{H_{2}}=sqrt{7} T_{N_{N}} ) |
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270 | The fragrance of flowers can be felt as soon as one enters the room because of: A. condensation B. fusion c. diffusion D. solidification |
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271 | The mass of ( 3.01 times 10^{23} ) molecules of a gas iss ( 32.0 g . ) What volume does 8.00 g of the gas occupy at STP? A ( .2 .80 L ) B. ( 8.00 L ) c. ( 11.2 L ) D. 22.4 L E . ( 64.0 L ) |
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272 | Absolute zero is: This question has multiple correct options A. the temperature at which all particles stop moving. B. at -273 kelvins. C . at 0 degrees Celsius. D. the temperature at which water freezes. E. the temperature at which all gases turn into liquids. |
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273 | will mau vacuun muany) HUU • A vessel of volume V = 201 contains a mixture of hydrogen and helium at a temperature t = 20°C and pressure p=2.0 atm. The mass of the mixture is equal to m = 5.0 g. Find the ratio of the mass of hydrogen to that of helium in the given mixture. anderbon dioxide |
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274 | State True or False. The plot of ( P V ) vs ( P ) at particular temperature is called isobar. A. True B. False |
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275 | Gases deviate from the ideal gas behaviour because their molecules: A. possess negligible volume B. have forces of attraction between them c. are polyatomic D. are not attracted to one other |
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276 | A balloon filled with methane ( C H_{4} ) is pricked with a sharp point and quickly plunged into a tank of hydrogen at the same pressure. After sometime the balloon will have? A. Enlarged B. collapsed c. Remained unchanged in size D. Ethylene ( left(C_{2} H_{4}right) ) inside it |
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277 | There is more deviation in the behaviour of a gas from the ideal gas equation ( boldsymbol{P V}=boldsymbol{n} boldsymbol{R} boldsymbol{T} ) A. At high temperature and low pressure B. At low temperature and high pressure C. At high temperature and high pressure D. At low temperature and low pressure |
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278 | ( a ) ( b ) ( c ) |
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279 | Gases have the density and rigidity A. least B. maximum c. intermediate D. none |
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280 | Which one of the following is not a property of a gas? A. Can be compressed B. No definite shape c. Definite volume D. Definite mass |
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281 | At constant pressure, which of the following graph best shows the relationship between temperature and volume of a gas? ( A cdot A ) в. ( B ) ( c . C ) D. ( D ) E. ( E ) |
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282 | Plots of p versus ( 1 / V ) at different temperatures. Fige 11. Plots of ( p ) versus ( 1 / V ) at different temperatures. |
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283 | Janet thought that plants needed light and oxygen to grow. She set up four jars as shown to test this idea. Which jars would be necessary to test |
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284 | What needs to exist in order for a dipole-dipole force to happen? A. The molecules need to be very close to each other. B. The molecules need to be very far apart from each other C. The molecules need to include hydrogen. D. The molecules need to include carbon. E. Dipole-dipole forces can happen in any molecule in any situation. |
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285 | Which of the following phenomenon occurs when we open a bottle of perfume and its smell spreads in the entire room with in a short time? A. Evaporation B. Sublimation C . Diffusion D. Decantation |
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286 | Q3. A 34.0 dm3 cylinder contains 212 g of oxygen gas at 21°C. What mass of oxygen must be released to reduce the pressure in the cylinder to 1.24 bar? |
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287 | The vapour of a substance behaves as a gas: A. below critical temperature B. above critical temperature ( mathbf{c} cdot operatorname{at} 100^{circ} C ) ( mathbf{D} cdot operatorname{at} 1000^{circ} C ) |
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288 | Gases have low A. density ; compressibility B. compressibility ; density C. compressibility ; inter- molecular force D. compressibility ; volume |
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289 | According to the kinetic theory of gases: This question has multiple correct options A. Pressure of a gas is due to collisions of molecules with each other B. Kinetic energy is proportional to square root of the temperature C. Pressure of a gas is due to collisions of molecules against the sides of the container D. There is no force of attraction between gas molecules |
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290 | For a gas Van der Waal constant, ( b= ) ( 0.04281 L m o l e^{-1} . ) Calculate its critical volume |
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291 | An ideal gas is compressed in a closed container its U? A. Increases B. Decreases c. Remains same D. Both (1) & (2) |
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292 | Which of the following statement is true? A. Absolutely pure water does not contain any ions B. London forces is directly proportional to more number of loosely held elctron C. Allene is polar due its non planar structure D. ( C H_{3} O C H_{3} ) is less volatile than ( C_{2} H_{5} O H ) due to higher molecular weight |
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293 | Particles in water at ( 273 mathrm{K} ) have energy as compared to particles in ice at the same temperature. A . less B. more c. same D. Can’t say |
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294 | Pressure of real gas is less than the pressure of ideal gas because: A. No. of collisions increases B. Definite shape of molecul c. K.E. of molecule increases D. Inter molecular forces |
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295 | How many of the following properties are shown by liquid state? Rigidity, Definite volume. No free surface, Define shape A . 1 B . 2 ( c .3 ) ( D ) |
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296 | On moving away from the nucleus, the successive permitted orbits are further a part in the distance, but closer in energy’. Justify this statement. |
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297 | .53 Why does sharp glass edge become smooth on heating it upto its melting point in a flame? Explain which property of liquids is responsible for this phenomenon. la molto and |
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298 | If the van der Waals parameters of two gases are given as: ( a / d m^{6} b a r m o l^{-2} ) ( b / d m^{3} b a r m ) Gas ( 6.5 quad ) 0.056 Gas 18.0 0.01 Then which of the above statements is/are correct? This question has multiple correct options A. Critical volume of A <Critical volume of B B. Critical pressure of A <Critical pressure of B c. critical temperature of A ccritical temperature of B D. None of the above |
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299 | Assertion The heat absorbed during the isothermal expansion of an ideal gas against vacuum is zero. Reason The volume occupied by the molecules of an ideal gas is zero. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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300 | The state of matter with the least intermolecular forces of attraction is : A . solid state B. liquid state c. gaseous state D. plasma state |
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301 | Dalton’s law of partial pressure is not applicable to which of the following mixture of gases? This question has multiple correct options ( A cdot H_{2}+F_{2} ) в. ( N H_{3}+H C l ) ( mathbf{c} cdot S O_{2}+C l_{2} ) D. ( H_{2}+O_{2} ) |
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302 | You are told to prepare a closed experimental environment (a box) for student mice. The box volume will be 294 litres (about ( 10 f t_{3} ) ) and the entire air volume will be changed every minute. The relative humidity of the air entering the box is to be controlled at 40 per at ( 21^{circ} mathrm{C} ). What weight of ( mathrm{H}_{2} mathrm{O} ) (in grams) must be added to the flow of dry air per minute? [Equilibrium vapour pressure for ( boldsymbol{H}_{2} boldsymbol{O} ) at ( left.21^{circ} mathrm{C} simeq 19 text { torr }right] .[mathrm{R}=0.082 ) liter atm mole ( ^{-1} mathrm{deg}^{-1}, ) molecular weight ( left.boldsymbol{H}_{2} boldsymbol{O}=mathbf{1 8}right] ) [Write your answer to the nearest integer]. |
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303 | Match the Column-I with Column-II. | 11 |

304 | For gaseous state, which of the following is incorrect? A. Thermal energy = Molecular attraction B. Thermal energy >> Molecular attraction C. Thermal energy ( <> attractiori in liquid |
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305 | Find the following in ( 24 % ) (w/v) of the solution if the density of the solution is ( 1.06 g m l^{-1} ) (a) Weight of solute (b) Weight of solvent |
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306 | The kinetic energy of ( N ) molecules of ( O_{2} ) is ( x ) joule at ( -123^{circ} mathrm{C} ). Another sample of ( O_{2} ) at ( 27^{circ} C ) has a kinetic energy of ( 2 x ) The later sample contains molecules of ( boldsymbol{O}_{2} ) A. ( N ) B. ( N / 2 ) ( c cdot 2 N ) D. 3N |
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307 | Study the following graph and mark the incorrect statement following it. ( mathbf{T}left(^{circ} mathbf{C}right) ) A . At zero volume all lines meet at ( -273.15^{circ} mathrm{C} ). This temperature is known as absolute zero B. Each line of the volume vs temperature at constant pressure of graph is called isotherm c. All gases obey charles’ law at very low pressure and high temperature D. Pressure remaining constant, volume of a gas is directly proportional to its absolute temperature |
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308 | What type(s) of intermolecular forces exist between the following pair? ( H B r ) and ( H_{2} S ) A. Dipole-dipole intermolecular forces B. Induced dipole interactions c. Hydrogen bonding D. None of the above |
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309 | Volume of a gas at ( t^{circ} mathrm{C} ) is 20 litre when temperature of gas increases by ( 50^{circ} mathrm{C} ) at constant pressure than volume of gas increased by ( 25 % ) than calculate value of it? |
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310 | Assertion The Joule-Thomson coefficient for an ideal gas is zero. Reason There are no intermolecular attractive forces in an ideal gas. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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311 | Two non-reactive gases A and B are present in a container with partial pressures 200 and ( 180 mathrm{mm} ) of Hg. When a third non – reactive gas ( C ) is added then total pressure becomes 1 atm then mole fraction of ( mathrm{C} ) will be: A . 0.225 B. 0.75 ( c cdot 0.5 ) D. none of these |
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312 | . 45 Assertion (A) At constant temperature, pV vs V plot for real gases is not a straight line. Reason (R) At high pressure all gases have Z> 1 but at intermediate pressure most gases have Z < 1. (a) Both A and Rare true and R is the correct explanation of A (b) Both A and Rare true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true true but onnan is not the orrect onlanation of assortir |
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313 | Assuming that the behavior of ammonia is correctly described by the van der Waal’s equation near the critical point, and knowing the critical molar volume of ( 0.72500 mathrm{mol} L^{-1} ) and critical temperature of ( 405.3 mathrm{K} ) determine the critical pressure of ammonia. ( A cdot 109.8 ) atm B. 141.3 atm c. 152.6 atm D. 17.20 atm |
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314 | Assertion The gases ( H e ) and ( H_{2} ) are very different in their behaviour at any temperature and pressure but their compressibility factors are nearly the same at the critical point. Reason They have nearly the same critical constant. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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315 | Select the correct answer from the choices given below. The three states of matter are classified on the basis of differences of certain A. chemical properties B. physical properties c. physical and chemical properties D. none of the above |
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316 | All of the following statements are related to the kinetic molecule theory of gases except: A. gas molecules have no inter-molecular forces B. gas particles are in random motion C. the collisions between gas particles are elastic D. gas particles have no volume E. the average kinetic energy is proportional to the celsius temperature of the gas |
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317 | 9. At 100°C and 1 atm, if the density of liquid water is 1.0 g cm’ and that of water vapour is 0.0006 g cm , then the volume occupied by water molecules in 1 litre of steam at that temperature is: (a) 6 cm (b) 60 cm (c) 0.6 cm (d) 0.06 cm 0. |
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318 | Select the correct statements. This question has multiple correct options A. Vapour may be condensed to liquid by the application of pressure. B. To liquefy a gas one must lower the temperature below ( T_{c} ) and apply pressure. C ( . ) At ( T_{c} ) there is no distinction between liquid and vapour states D. At the ( T_{c} ), density of liquid is very high as compared to its gaseous state. |
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319 | Which of the following statements is NOT true in relation to a system that has reached the critical temperature? A. Substances can have more than one critical temperature. B. A surface between the liquid and vapour phases is no longer present. C. The system can be described as a homogenous fluid D. The system must a closed system |
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320 | 023. Explain the physical significance of van der Waals parameters. | 11 |

321 | According to the ideal gas law, what is the approximate volume that will be occupied by 0.5 mole of an ideal gas at ( 30^{circ} mathrm{C} ) and 3 atm pressure (gas constant ( boldsymbol{R}=mathbf{0 . 0 8 2 1} boldsymbol{L} . boldsymbol{a t m} /(boldsymbol{m o l . K})) ? ) A. Less than 1 L в. 5 L ( c .10 L ) D. 15 L |
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322 | Q. 36 Name two phenomena that can be explained on the basis of surface tension. |
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323 | Two flasks ( A ) and ( B ) is 500 m ( L ) each are respectively filled with ( O_{2} ) and ( S O_{2} ) at ( 300 K ) and 1 atm pressure. The flasks contain : A. The same number of atoms B. The same number of molecules c. More number of moles in flask ( A ) as compared to flask ( B ) D. The same amount of gases |
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324 | At lower temperature, most gases show: A. negative deviation B. positive deviarion c. positive and negative decviation D. none of the above |
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325 | Compressed oxygen is used for: A. Welding purpose B. Airship C . Refrigerant D. Soda fountains |
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326 | To use Boyle’s Law, which of the following needs to remain constant? A. Temperature and number of moles of a gas B. Temperature and pressure C. Pressure and number of moles of a gas D. Pressure and volume E. Temperature and volume |
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327 | The kinetic energy of particles is maximum in A . gas B. liquid c. solid D. Same in all the states |
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328 | Assertion ( H C l ) diffuses faster than ammonia. Reason Rate of diffusion of a gas is inversely proportional to the square root of its |
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329 | . 2 Which of the following property of water can be used to explain the spherical shape of rain droplets? (a) Viscosity (b) Surface tension (c) Critical phenomena (d) Pressure |
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330 | The rise of a liquid in a capillary tube is due to : A. Visosity B. Osmosis c. Diffusion D. Surface tension |
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331 | Which of the following has the highest density? A. Kerosene B. water c. Iron D. woodd |
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332 | 1. According to kinetic molecular theory (a) matter is made up of small particles that may be atoms, molecules or ions. (b) the empty space (gap) between the particles is known as intermolecular space. (c) molecules exert an attractive force upon each other. (d) the molecules always remain fixed. |
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333 | By how many times the absolute temperature of a gas would increase when ( u_{r m s} ) of a gas in a container of fixed volume is increased from ( 5 times ) ( 10^{4} mathrm{cm} sec ^{-1} ) to ( 10 times 10^{4} mathrm{cm} mathrm{sec}^{-1} ? ) |
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334 | Calculate rms speed in ( c m / )sec of oxygen molecules having K.E of ( 2 k c a l / m o l ) | 11 |

335 | nRT Q. 32 Compressibility factor, Z of a gas is given as Z = (i) What is the value of Z for an ideal gas? (ii) For real gas what will be the effect on value of Z above Boyle’s temperature? |
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336 | Find the critical constant ( left(P_{c}, V_{c} text { and } T_{c}right) ) in terms of ( A ) and ( B ) also find compressibility factor ( (Z) ) for the following equation of state. [ boldsymbol{P} boldsymbol{V}=boldsymbol{R T}-frac{boldsymbol{A}}{boldsymbol{V}}+frac{boldsymbol{2} boldsymbol{B}}{boldsymbol{V}^{2}} ] where ( A ) and ( B ) are constant, ( P= ) pressure and ( V= ) molar volume. ( mathbf{A} ) [ begin{array}{l} V_{c}=frac{6 B}{A}, T_{c}=frac{A^{2}}{6 R B}, P_{c}=frac{A^{3}}{108 R B}, text { compressibility } \ text { factor }=frac{P_{c} V_{c}}{R T_{c}} frac{1}{3} end{array} ] B. [ V_{c}=frac{3 B}{A}, T_{c}=frac{A^{2}}{3 R B}, P_{c}=frac{A^{3}}{108 R B}, text { compressibility } ] [ text { factor }=frac{P_{c} V_{c}}{R T_{c}} frac{1}{3} ] ( c ) [ begin{array}{l} V_{c}=frac{6 B}{A}, T_{c}=frac{A^{2}}{6 R B}, P_{c}=frac{A^{3}}{54 R B}, text { compressibility } \ text { factor }=frac{P_{c} V_{c}}{R T_{c}} frac{1}{2} end{array} ] D. None of these |
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337 | The root mean square speed at ( N T P ) for the ( operatorname{gases} C H_{4}, H_{2}, H e ) and ( F_{2} ) are in the order A ( cdot C H_{4}<H_{2}<H e<F_{2} ) B. ( H_{2}<H e<C H_{4}<F_{2} ) c. ( H_{2}<H e<F_{2}<C H_{4} ) D. ( F_{2}<C H_{4}<H_{2}<H e ) |
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338 | 9. Out of the following, intramolecular hydrogen bonding exists in: (a) water (b) HS (c) 4-nitrophenol (d) 2-nitrophenol |
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339 | State whether the statement is true or false: The relation between the measurable |
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340 | ( 0.24 g ) of a volatile substance, upon vaporisation, gives ( 45 mathrm{ml} ) vapour at ( mathrm{NTP} ) What will be the vapour density of the substance? ( mathbf{A} cdot 95.93 ) B. 59.8 c. 95.39 D. 5.993 |
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341 | State True or False. All the molecules in a gas have the same kinetic energy. A. True B. False |
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342 | Statement I: Under the conditions of low pressure and high temperature, the ideal gas laws are inaccurate. Statement II: The deviation from the |
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343 | Q. 30 Name two intermolecular forces that exist between HF molecules in liquid state. |
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344 | 10. The rms speed of hydrogen is 17 times the rms speed of nitrogen. If T is the temperature of the gas, then: (a) TH, = TN, (b) TH, >IN, (c) TH, <IN, (d) TH, = V7TN, |
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345 | State whether the statement is true or false: Boyle’s law is applicable only when mass and temperature are made variable. |
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346 | What are the characteristics of a gas? A. A state of matter that has free electrons. B. A state of matter that conducts electricity well. C. A state of matter that has both a fixed volume and shape. D. A state of matter that does not have a definite volume or shape E. A state of matter that has a definite volume but not a definite shape. |
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347 | At what temperature would the volume of a given mass of a gas at constant pressure be twice its volume at ( 0^{circ} mathrm{C} ) ? ( mathbf{A} cdot 546^{circ} C ) B. ( 100^{circ} mathrm{C} ) c. ( 273^{circ} mathrm{C} ) D. ( 373^{circ} mathrm{C} ) |
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348 | Calculate the number of molecules of oxygen gas that occupies a volume Of 22 ( mathrm{ml} ) at ( 273 mathrm{K} ) and 3 atm pressure. |
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349 | Among the following mixtures, dipoledipole as the major interaction, is present in A. Benzene and ethanol B. Acetonitrile and acetone C. KCl and water D. Benzene and carbon tetrachloride |
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350 | A vessel contains 1.6 g of dioxygen at STP ( (273.15 K, 1 text { atm pressure }) . ) The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. The volume of the new vessel is: A . 2.24 B. 22.4 L c. ( 11.2 mathrm{L} ) D. 1.12 L |
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351 | A large ship can float but a steel needle sinks because of A. Viscosity B. Surface tension c. Density D. None of these |
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352 | Which of the following postulates of kinetic theory of gases is not correct? A. Gases consist of particles which are in continuous, random motion B. The particles are infinitely small and very close to each other C. The collisions of the particles with each other are elastic D. The pressure of a gas is caused by the collisions of gas particles with the wall of the container |
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353 | 19. The force of attraction between similar molecules is called (a) Cohesive force (b) Adhesive force (c) Friction force (d) None of these |
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354 | The diameters of a bubble at the surface of a lake is ( 4 m m ) and at the bottom of the lake is 1 mm. If atmospheric pressure is 1 atm and the temperature of the lake-water and the atmosphere are equal. What is the depth of the lake? [The density of lake-water and ( H g ) are 1 ( g m / m l text { and } 13.6 g m / m l text { respectively }] ) A. ( 120.5 mathrm{m} ) B. 200.4 m ( c cdot 184.5 mathrm{m} ) D. 153.03 ( mathrm{m} ) |
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355 | ( frac{sqrt{1}}{frac{1}{x}} ) | 11 |

356 | Calculate the number of moles of hydrogen gas present in ( 0.5 d m^{3} ) sample of hydrogen gas at a pressure of ( 101.325 K P a ) and at ( 27^{circ} C . ) (Write up to 2 decimal places |
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357 | Match the following begin{tabular}{llll} State of matter & A & B \ hline 1 & Gas & Soil & Milk \ 2 & Solid & Kerosene & Oxygen \ 3 & Liquid & Carbon Monoxide & Peas end{tabular} |
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358 | The correct relationship between ( T_{c}, T_{b} ) and ( boldsymbol{T}_{boldsymbol{i}} ) is: |
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359 | Which of the following is/are correct about critical conditions of real gas following van der Waal’s equation of state? This question has multiple correct options A ( cdot ) At ( T_{C}, ) there is no distinction between liquid and vapour state, hence the density of liquid becomes equal to the density of vapour B. ( A t ) ( T_{C}, ) both ( left[frac{partial P}{partial V}right]_{T} ) and ( left[frac{partial^{2} P}{partial V^{2}}right]_{T} ) are equal to zero ( mathbf{C} cdot Z=3 / 8 ) for every gas at ( T_{C}, ) and gases are more compressible than ideal gas D. For temperature less than ( T_{C} ), the volume has three imaginary roots |
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360 | Which quantity is zero for a crystalline solid that is elementally pure at ( 0 mathrm{K} ? ) A. Standard voltaic potential B. Entropy c. Enthalpy D. Reaction rate E. Gibbs free energy |
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361 | When does a gas deviate the most from its ideal behavior? A. At low pressure and high temperature B. At high pressure and high temperature c. At low pressure and low temperature D. At high pressure and low temperature |
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362 | The diagram given shows a piston fitted in a cylinder. The most suitable inference that can be drawn from it is that A. the piston is smooth B. the particles can be compressed or brought closer by applying pressure c. the handle of piston is long D. None of the above |
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363 | Match the Column-I with Column-II for van der Waals’ equation. |
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364 | Um Lyuar u zero, .e., the gas ceases to exist. 22. Critical temperature for CO, and CH are 31.1°C and -81.9°C respectively. Which of these has stronger intermolecular forces and why? |
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365 | Consider the van der Waals constants, ( a ) and ( b, ) for the following gases. Gas What is and ( A r ) ( N e ) ( boldsymbol{K} boldsymbol{r} ) ( mathrm{a} / mathrm{catm} ) ( d m^{6} m o l^{-2} ) 5.1 0.2 1.3 ( begin{array}{lll}text { 3.2 } & text { 1.7 } & text { 1.0 }end{array} ) ( mathrm{b} / mathrm{c} ) ( 10^{-2} mathrm{dm}^{3} mathrm{mol}^{-1} ) Which gas is expected to have the highest critical temperature? ( mathbf{A} cdot K r ) B. ( N e ) c. ( A r ) D. ( X e ) |
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366 | Q. 25 Value of universal qas constant (R) is same for all gases. What is its physical significance? BpV |
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367 | Fill in the blanks: The gaseous form of water found in air |
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368 | At same pressure,temperature and volume what will be deviation for both ( operatorname{gases} N_{2} operatorname{gas} ) and ( H e ) gas A. Same deviation B. Deviation for ( N_{2}>H e ) c. Deviation for ( H e>N_{2} ) D. No deviation for both gases |
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369 | A gas will approach ideal behavior at: A. low temperature and low pressure B. low temperature and high pressure c. high temperature and low pressure D. high temperature and high pressure |
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370 | The greater the critical temperature of a gas, the easier is the liquefaction of the gas. A. True B. False c. Nither D. None of the above |
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371 | The volume of ( N H_{3} ) gas desorbed from charcoal surface at STP is: A . 0.526 B. 0.426 L c. 0.326 D. 0.226 L |
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372 | Q. 4 The interaction energy of London force is inversely propor power of the distance between two interacting particles magnitude depends upon (a) charge of interacting particles (b) mass of interacting particles (c) polarisability of interacting particles (d) strength of permanent dipoles in the particles |
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373 | I The ideal gas law does not hold under low temperatures and high pressure. II : Interactions between particles cannot be neglected under these conditions. A . I is true, II is true B. I is true, II is false c. I is false, ll is false D. I is false, Il is true |
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374 | If a gas has ( R M S ) velocity ( 5.2 times ) ( 10^{4} mathrm{cm} / mathrm{s} . ) Find the average and M.P velocity of the gas. |
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375 | In the calculation of ( R M S ) velocity in ( c m / )sec( , ) the units of ( R ) should be in: A . erg/mole ( -K ) B. joules/mole – K c. cals( / )mole ( -K ) D. ergs |
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376 | Which of the following statement(s) is/are true? This question has multiple correct options A. The ratio of the mean velocity to the rms velocity of a gas molecule is independent of temperature. B. The square of the most probable speed of the gas molecules is equal to four times its average speed. C. Mean kinetic energy of a gas depends on its mass and temperature but does not depend on volume or pressure. D. The difference between rms velocity and mean velocity at any temperature for different gases decreases for gases with large molar mass. |
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377 | Why are the world’s major ocean fisheries located in cold regions? | 11 |

378 | Amongst the following statements, the correct one is : A. The gas can not be compressed below the critical temperature B. Below critical temperature, thermal motion of the molecules is slow enough for the intermolecular forces to come into play leading to condensation of the gas. C. At critical temperature liquid and gaseous phase can be distinguished D. An ideal gas has a characteristic critical temperature |
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379 | Which of the following has the maximum value of mean free path? A. ( C O_{2} ) в. ( H_{2} ) ( c cdot O_{2} ) D. ( N_{2} ) |
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380 | A gas is enclosed in a vessel of volume ( boldsymbol{V} ) at temperature ( boldsymbol{T}_{1} ) and pressure ( boldsymbol{P} ) the vessel is connected to another vessel of volume ( V / 2 ) by a tube and a stopcock. The second vessel is initially evacuated. If the stopcock is opened, the temperature of the second vessel becomes ( T_{2} ). The first vessel is maintained at a temperature of ( T_{1} ) What is the final pressure ( P_{1} ) in the apparatus? A ( frac{2 P T_{2}}{2 T_{2}+T_{1}} ) в. ( frac{2 P T_{2}}{T_{2}+T_{1}} ) c. ( frac{P T_{2}}{2 T_{2}+T_{1}} ) D. ( frac{2 P T_{2}}{T_{1}+T_{2}} ) |
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381 | At constant temperature when pressure of gas decreased by ( 50 % ) than since percentage change in volume. | 11 |

382 | Q. 26 One of the assumptions of kinetic theory of gases states that “there is no force of attraction between the molecules of a gas.” How far is this statement correct? Is it possible to liquefy an ideal gas? Explain. |
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383 | SI units of ( b ) is ( 4 cdot m^{-2} s^{2} ) 3. ( m^{2} s^{2} ) c. ( m^{2} s^{-2} ) D. ( m s^{-} ) |
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384 | Assertion All molecules of an ideal gas move with the same speed. Reason There is no attraction between the molecules in an ideal gas. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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385 | The temperature of a gas is T K. What would be the temperature at which volume and pressure, both will reduce to half of the initial values? A . T/2 B. T/4 ( c cdot T / 3 ) D. T/ |
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386 | A gas that follows Boyle’s law, Charles law and Avogadro’s law is called an ideal gas. Under what conditions a real gas would behave ideally? A. High pressure & low temperature B. Low pressure & high temperature c. Low pressure & low temperature D. High pressure & high temperature |
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387 | When sugar is dissolved in water, the level of water A. increases B. decreases c. remains same D. data insufficient |
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388 | wwuu CAILLUuy suuralu vale vapo 15 Cauca aqueou Q11. How is compressibility factor expressed in terms of molar volume of the real gas and that of the ideal gas? TZ |
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389 | At critical temperature, the surface tension of a liquid is A . zero B. infinity c. the same as that at any other temperature D. can not be determined |
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390 | A steel cylinder of 8 litres capacity contains hydrogen gas at 12 atm pressure. At the same temperature, how many cycle tubes of 4 litres capacity at 2 atm can be filled up with this gas? A ( cdot 12 ) B. 48 ( c cdot 5 ) D. 10 |
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391 | Which of the following order is true about the force of attraction between particles of states of matter? A. Gas > Solid > Liquid B. Solid > Liquid>Gas c. Gas ‘Liquid > Solid D. Liquid > Gas> Solid |
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392 | The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon: A. charge of interacting particles B. mass of interacting particles c. polarisability of interacting particles D. strength of permanent dipoles in the particles |
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393 | When 2 g of gas ( A ) is introduced into an evacuated flask kept at ( 25^{circ} C ), the pressure was found to be 1 atmosphere If 3 g of another gas ( B ) is then added to the same flask, the pressure becomes 1.5 atm. Assuming ideal behaviour, the ratio of molecular weights ( left(M_{B}: M_{A}right) ) is : A . 1: 3 B. 3: c. 2: 3 D. 3: |
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394 | Q. 13 How does the surface tension of a liquid vary with increase in temperature? (a) Remains same (b) Decreases (c) Increases (d) No regular pattern is followed |
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395 | At low pressure, the graph of ( boldsymbol{P} boldsymbol{V} boldsymbol{v} boldsymbol{s} frac{mathbf{1}}{boldsymbol{V}} ) for a given amount at a constant temperature for a real gas is A. straight line parallel to x-axis B. straight line having positive intercept and negative slope c. straight line passing through origin having positive slope D. none of the above |
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396 | At constant temperature, if the pressure of a gas of volume ( mathrm{V} ) in a container is doubled then the change in its volume is ( A cdot v ) в. ( frac{V}{2} ) c. ( frac{V}{4} ) D. 2v |
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397 | Critical temperature of a gas is its Boyle temperature. A. higher than B. equal to c. lower than D. no relation |
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398 | Normal temperature of the human body is ? ( mathbf{A} cdot 40^{circ} F ) B . ( 40^{circ} mathrm{C} ) ( mathbf{c} cdot 37^{circ} C ) D. ( 37^{circ} F ) |
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399 | Which of the following statements are correct? This question has multiple correct options A. The water drop in vaccum is perfectly spherical. B. The shape of water drop is distorted due to action of gravity. C. Soaps and detergents drastically decrease the surface tension of water. D. As temperature increases, surface tension also increases and becomes maximum at critical temperature |
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400 | If saturated vapours are compressed slowly (temperature remains constant) to half the initial volume, their pressure will: A. become four times B. become double c. remain unchanged D. become half |
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401 | At ( 400 mathrm{K} ), the root mean square (r.m.s) speed of a gas ( mathrm{X} ) (molecular weight ( = ) 40 ) is equal to the most probable speed of gas ( Y ) at 60 K. The molecular weight of the gas Y is: ( A cdot 3 ) B. 4 c. 10 D. |
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402 | 63. A vessel of volume V=5.01 contains m=1.4g of nitrogen at temperature T – 1800 K. Find the gas pressure, taking into accoun that n=30% of molecules are disassociated into atoms at this temperature. |
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403 | ( 510 m g ) of a liquid on vaporization in victor Mayer’s apparatus displaces ( 67.2 m l ) of dry air (at NTP). The molecular weight of liquid is: A. 130 B. 17 ( c .1700 ) D. 170 |
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404 | The pressure and temperature of ( 4 d m^{3} ) of carbon dioxide gas are doubled. Then volume of carbon dioxide would be : ( mathbf{A} cdot 2 d m^{3} ) B. ( 3 d m^{3} ) ( mathbf{c} cdot 4 d m^{3} ) D. ( 8 d m^{3} ) |
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405 | Based on the Maxwell-Boltzmann graph below, which of the following statements is TRUE? ( A cdot T_{1} ) is at a higher temperature than ( T_{2}, ) so more molecules will react to form products B. The reaction is exothermic, so increasing kinetic energy decreases the rate of the reaction ( mathrm{c} cdot T_{2} ) is at a higher temperature than ( T_{1}, ) so more molecules will react to form products D. The reaction is endothermic, so increasing kinetic energy increases the rate of the reaction |
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406 | Q. 24 Two different gases ‘A’ and ‘B’ are filled in separate cont capacity under the same conditions of temperature and pressure. On increasing the pressure slightly the gas ‘A’ liquefies but gas B does not liquify even on applying high pressure until it is cooled. Explain this phenomenon. |
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407 | The pressure required to liquefy a gas at the critical temperature is called A. reduced pressure B. critical pressure c. vapour pressure D. atmospheric pressure |
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408 | A chemist has synthesized a greenish yellow gaseous compound of chlorine and oxygen and finds that its density is ( 7.71 g / L ) at ( 36^{0} C ) and 2.88 atm. Then molecular formula of the compound will be: A ( cdot C l O_{3} ) в. ( C l O_{2} ) c. ( C l O ) D. ( C l_{2} O_{2} ) |
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409 | Q4. What is the effect of temperature on (1) surface tension and (ii) Viscosity? Ang G urface tension de marith inanann of tamnonntun |
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410 | The molecule which has zero dipole moment is: A ( . C H_{3} C l ) в. ( N F_{3} ) ( mathrm{c} cdot B F_{3} ) D. ( C l O_{2} ) |
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411 | The liquefaction behaviour of temporary gases approaches that of permanent gases as we go: A. below critical temperature B. above critical temperature c. above absolute zero D. below absolute zero |
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412 | Calculate the minimum number of balloons each of volume 82.1 L required to lift a mass of ( 1 mathrm{kg} ) to a height of 831 ( mathbf{m} ) Given: molar mass of air ( =29 mathrm{g} / mathrm{mol} ), the temperature is constant at ( 290 mathrm{K} ) and mass of each balloon is 40 g. ( left[text { Use } e^{-01}=0.9, text { pressure at sea level }=1right. ) atm, acceleration due to gravity ( (g)=10 ) ( left.mathrm{m} / mathrm{s}^{2}right] ) A . 10 в. 20 ( c cdot 25 ) D. 50 |
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413 | Name the state of matter in which particles just move randomly because of a very weak force of attraction. |
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414 | A gas can never be liquefied at? A. ( T=T_{C} ) and ( P=P_{C} ) в. ( T<T_{C} ) and ( P=P_{C} ) c. ( T<T_{C} ) and ( P T_{C} ) and ( P>>P_{C} ) |
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415 | Which is wrong according to kinetic theory of gases? A. Average ( K E ) of molecules is proportional to the absolute temperature B. Collisions between molecules are perfectly elastic C. Pressure is due to collisions between molecules D. There are no attractive forces between the molecules of gas |
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416 | Air contains ( 79 % N_{2} ) and ( 21 % O_{2} ) by volume. If the pressure is 750 of ( H g ), the partial pressure of ( boldsymbol{O}_{2} ) is: A. 157.5 of ( H g ) B. 175.5 of ( H g ) c. 315.0 of ( H g ) D. 257.5 of ( H g ) |
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417 | Which of the following statement is incorrect? A. At high temperature an low pressure gas shows ideal behaviour B. Gas can be liquefied above critical temperature on applying pressure C. He gas shows positive deviation at ( 273 K ) D. All of these |
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418 | Calculate the mean free path in ( C O_{2} ) at ( 27^{circ} mathrm{C} ) and a pressure of ( 10^{-9} ) bar. Molecular diameter of ( C O_{2} ) is 500 pm. Given ( : mathrm{R}=frac{25}{3} J . m o l^{-1} K^{-1}, sqrt{2}= ) |
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419 | Volume is inversely proportional to pressure is: A. Boyle’s law B. Charles’s law c. Avogadro’s principle D. ideal gas law |
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420 | An ideal gas obeying kinetic gas equation: A. can be liquefied if its temperature is more than critical temperature B. can be liquefied at any value of any value T and P C. can not be liquefied under any value of ( T ) and ( P ) D. can be liquefied if its pressure is more than critical pressure |
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421 | When the temperature is increased, surface tension of water: A. increases B. decreases c. remains constant D. shows irregular behaviour |
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422 | Which are heavier than dry air? This question has multiple correct options A. Moist air в. ( S O_{2} ) ( c cdot C l_{2} ) D. ( O_{2} ) |
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423 | Gases can easily change volume because A. little attraction between particles B. little spacing between particles C . huge attraction between particles D. none of above |
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424 | Inelastic collisions occur in : I. Real gases II. Ideal gases III. Fusion reactions Which of the following is correct option about the above problem? A . I and II B. II and III c. I and III D. I only E. II only |
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425 | What is the relationship between thermal energy and intermolecular interaction energy of a substance in three states in terms of ( X ) and ( Y ? ) Gas( rightarrow )Liquid( rightarrow )Solid Predominance of ( boldsymbol{X} ) Predominance of ( boldsymbol{Y} ) A. ( x ) -Thermal energy, Y- Intermolecular interactions B. X-Thermal energy, Y-Thermal energy c. ( x ) -Intermolecular interactions, Y-Thermal energy D. x-ıntermolecular interactions, Y-Intermolecular interactions |
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426 | Keeping the pressure constant, the volume of a given mass of any gas increases or decreases by ( frac{1}{273} ) of its volume at ( boldsymbol{O}^{circ} boldsymbol{C} ) for each ( mathbf{1}^{circ} ) rise in temperature. This law is known as: A. Boyle’s law B. Charles’s law c. Gay-lussac’s law D. None of the above |
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427 | Total kinetic energy of sample of a gas which contains ( 1 times 10^{22} ) molecules is ( 24 times 10^{2} J ) at ( 127^{circ} C . ) Another sample of ( operatorname{gas} operatorname{at} 27^{circ} C ) has a total kinetic energy of ( 48 times 10^{2} J . ) The number of molecules in the second sample are: A. ( 2.67 times 10^{22} ) B. ( 1 times 10^{2} ) C ( .1 times 10^{24} ) D. ( 5.5 times 10^{21} ) |
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428 | Which of the following exists as a liquid at room temperature due to the formation of associated molecules only? A. Benzene B. Ammonia c. Bromine D. carbon disulphide |
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429 | Assertion An ideal gas is not expected to show any cooling on free expansion. Reason Ideal gas does not exist but is useful concept. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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430 | ( mathbf{A} ) ( 2.24 L ) cylinder of oxygen at ( 1 a t m ) and ( 273 K ) is found to develop a leakage. When the leakage was plugged the pressure dropped to ( 570 m m ) of Hg. The number of moles of gas that escaped will be: A. 0.025 B. 0.050 c. 0.075 D. 0.09 |
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431 | 2. 50 Isotherms of carbon dioxide at various temperatures are represented figure. Answer the following questions based on this figure. Ti < T2 < To <T3 Alina Pressure 12 a Volume — (i) In which state will co, exist between the points a and b at temperature T.? (ii) At what point will Co, start liquefying when temperature is T.? (iii) At what point will Co, be completely liquefied when temperature is T? (iv) Will condensation take place when the temperature is T ? (v) What portion of the isotherm at represent liquid and gaseous Co, at equilibrium? |
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432 | Gases do not liquefy above the critical temperature because above critical temperature: A. The gaseous become ideal B. The intermolecular attraction vanishes C. The kinetic energy of molecules become so large that the attractive forces become unable to hold the molecules together D. The repulsive forces dominates in the molecules |
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433 | Among the following, the incorrect statement is: A. at low pressure, real gases show ideal behaviour B. at very low temperature, real gases show ideal behaviour C. at Boyle’s temperature, real gases show ideal behaviour D. at very large volume, real gases show ideal behaviour |
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434 | At what temperature is the kinetic energy of a gas molecule half of its value at ( 327^{circ} mathrm{C} ) ? A . ( 13.5^{circ} mathrm{C} ) B . ( 150^{circ} mathrm{C} ) ( mathbf{c} cdot 27^{circ} C ) D. ( -123^{circ} mathrm{C} ) |
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435 | Calculate the value of molar gas constant, ( ^{prime} boldsymbol{R}^{prime} ) in (i) ( boldsymbol{c} boldsymbol{c} boldsymbol{a} boldsymbol{t} boldsymbol{m} boldsymbol{K}^{-1} boldsymbol{m} boldsymbol{o} boldsymbol{l}^{-1} ) (ii) ( operatorname{tor} r c c K^{-1} m o l^{-1}(text {iii }) ) kPalitre ( boldsymbol{K}^{-1} boldsymbol{m o l}^{-1} ) |
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436 | Given a sample of one mole of the indicated gas at the following conditions Which of the following has the highest molecular speed? A ( . H e ) at ( 100^{circ} mathrm{C} ) and 1 atm B. ( H e ) at ( 25^{circ} C ) and 1 atm c. ( A r ) at ( 25^{circ} C ) and 1 atm D. ( A r ) at ( 25^{circ} C ) and 2 atm E. ( A r ) at ( 0^{circ} C ) and 1 atm |
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437 | Q1. What is the value of the gas constant in SI units? | 11 |

438 | Assertion Helium shows only positive deviations from ideal behaviour. Reason Helium is an inert gas. |
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439 | The root mean square velocity of one mole of a monoatomic gas having molar ( operatorname{mass} M ) is ( U_{r m s} . ) The relation between average kinetic energy ( (boldsymbol{E}) ) of the gas and ( U_{r m s} ) is : ( ^{mathrm{A}} cdot U_{r m s}=sqrt{frac{3 E}{2 M}} ) В. ( U_{r m s}=sqrt{frac{2 E}{3 M}} ) c. ( quad v_{r m s}=sqrt{frac{2 E}{M}} ) D. ( U_{r m s}=sqrt{frac{E}{3 M}} ) |
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440 | Select the correct option(s) for an ideal gas. This question has multiple correct options A. Most probable speed increases with increase in temperature B. Fraction of particles moving with most probable speed increases with increase in temperature C. Fraction of particles moving with most probable speed are more for ( C l_{2} ) than ( H_{2} ) under similar condition of ( T ) ( P & V ) D. Most probable speed is more ( C l_{2} ) than ( H_{2} ) at same temperature |
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441 | Define critical temperature of a gas. Give its expression. |
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442 | Viscosity of a liquid is increases by : A. increase in temperature B. decrease in molecular size c. increase in molecular size D. none of the above |
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443 | Which of the following is highly compressible? A. Solids B. Liquids c. Gases D. None of these |
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444 | A cylinder is filled with a gaseous mixture containing equal masses of ( C O ) and ( N_{2} . ) The ratio of their partial pressure is: ( mathbf{A} cdot P_{N_{2}}=P_{C O} ) B . ( P_{C O}=0.875 P_{N_{2}} ) c. ( P_{C O}=2 P_{N_{2}} ) D. ( P_{C O}=frac{1}{2} P_{N_{2}} ) |
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445 | The volume of ( 1.0 g ) of hydrogen at NTP is: A ( .2 .24 L ) B. 22.4 L c. ( 1.12 L ) D. ( 11.2 L ) |
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446 | One litre of ( C O_{2} ) is passes over hot coke. After one hour volume becomes 1.4 4 Itres. Composition of product is: A. 0.6 litre ( C O_{2} ) B. 0.8 litre ( C O_{2} ) c. 0.6 litre ( C O_{2} ) and 0.8 litre co D. None of these |
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447 | 2.46 Assertion (A) The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature, Reason (R) At high altitude atmospheric pressure is high. (a) Both A and Rare true and R is the correct explanation of A (b) Both A and R are true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true |
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448 | State True or False. Real gases consists of atoms or molecules with intermolecular attractions and repulsions. A. True B. False |
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449 | A flask of ( 4.48 mathrm{L} ) capacity contains a mixture of ( N_{2} ) and ( H_{2} ) at ( 0^{circ} mathrm{C} ) and 1 atm pressure. If the mixture is made to react to form ( N H_{3} ) gas at the same temperature, the pressure in the flask reduces to 0.75 atm. The partial pressure of ( N H_{3} ) gas in the final mixture is? A. 0.33 atm B. 0.50 atm c. 0.66 atm D. 0.25 atm |
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450 | A substance ‘P’ does not have a fixed, volume. It occupies the total space of the container and it can be compressed. What is ‘P’ likely to be? A. Solid B. Liquid c. Gas D. All of these |
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451 | Assertion On heating a substance to its melting point, inter-particle space increases. Reason When a substance is heated, the kinetic energy of the particles(molecules/atoms) increases, due to which they push each other farther than their mean position. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect. D. Both Assertion and Reason are incorrect. |
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452 | An oxygen cylinder of volume 30 litres has an initial gauge pressure of 15 atm and a temperature of ( 27^{circ} mathrm{C} ). After some oxygen is withdrawn from the cylinder the gauge pressure drops to 11 atm and its temperature drops to ( 17^{circ} mathrm{C} ) Estimate the mass of oxygen taken out of the cylinder. ( left(R=8.31 J m o l^{-1} K^{-1}, ) molecular right. |
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453 | State True or False. The average speed of a gas varies linearly with increase of temperature. A. True B. False |
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454 | Unknown gas diffuses with ( mathrm{CO}_{2} ). Rate of diffusion of unknown gas is double than that of ( mathrm{CO}_{2} ). The molecular weight of the unknown gas is: A . 22 B . 30 c. 11 D. 44 |
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455 | The RMS velocity of hydrogen is ( sqrt{7} ) times the RMS velocity of nitrogen. If ( boldsymbol{T} ) is the temperature of gas, then: A ( cdot T_{left(H_{2}right)}=T_{left(N_{2}right)} ) B . ( T_{left(H_{2}right)}>T_{left(N_{2}right)} ) c. ( T_{left(H_{2}right)}<T_{left(N_{2}right)} ) D. ( T_{left(H_{2}right)}=sqrt{7} T_{left(N_{2}right)} ) |
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456 | State True or False. The observed pressure of a real gas is more than the ideal pressure A. True B. False |
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457 | Why does the boundary between liquid phase and gaseous phase disappear on heating a liquid upto? Critical temperature in a closed vessel? | 11 |

458 | On which of the following factors, does the molecular arrangement of a substance depend? A. Temperature and pressure B. Concentration and temperature c. Temperature, pressure and concentration D. Volume and pressure |
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459 | Which of the following statements is not true? A. The ratio of the mean speed to the ( R M S ) speed is independent of the temperature B. The square of the mean speed of the molecules is equal to the mean squared speed at certain temperature C. Mean kinetic energy of the gas molecules at any given temperature is independent of the mean speed D. The difference between rms speed and mean speed at any temperature for different gases diminishes as larger and larger molar masses are considered |
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460 | At constant temperature ( 250 m L ) of argon at a 760 mm ( H g ) pressure and ( 60 m L ) of nitrogen at 500 mm pressure are put together in one litre flask. The final pressure is mm Hg |
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461 | Assertion Helium will have fewer dispersion forces between its atoms than the other noble gases Reason As the mass of nonpolar atoms and molecules increases, dispersion forces increase A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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462 | It is easier to liquefy oxygen than hydrogen because: A. oxygen has a higher critical temperature and lower inversion temperature than hydrogen. B. oxygen has a lower critical temperature and higher inversion temperature than hydrogen. C. oxygen has a higher critical temperature and higher inversion temperature than hydrogen. D. the critical temperature and inversion temperature of oxygen is very low. |
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463 | A rigid tank contains ( 35 k g ) of nitrogen at 6 atm. Sufficient quantity of oxygen is supplied to increase the pressure to 9 atm, while the temperature remains constant. Amount of oxygen supplied to the tank is : A. ( 5 k g ) B. ( 10 mathrm{kg} ) c. ( 20 k g ) D. ( 40 mathrm{kg} ) |
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464 | The average velocity of an ideal gas molecule at ( 27^{circ} mathrm{C} ) is ( 0.3 m s^{-1} . ) The average velocity at ( 927^{circ} mathrm{C} ) will be Write numerical value (upto 2 digit only) after decimal point only as for 0.19 write ( 19) ) |
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465 | What type(s) of intermolecular forces exist between the following pair? ( C l_{2} ) and ( C B r_{4} ) A. Dispersion forces B. Hydrogen bonding C. Dipole-Dipole interactions D. None of the above |
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466 | The ( S I ) unit of the coefficient of viscosity is: A ( cdot N s^{-1} m^{-2} ) B. ( N s m^{-2} ) c. ( N s^{-2} m^{-2} ) D. ( N s^{-1} m^{-3} ) |
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467 | The given graph shows the vapor pressure curves for some liquids. Liquids ( A, B, C ) and ( D ) respectively are: A. diethyl ether, acetone, ethyl alcohol, water B. acetone, ethyl alcohol, diethyl ether, water c. water, ethyl alcohol, acetone, diethyl ether D. ethyl alcohol, acetone, diethyl ether, water |
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468 | Assertion (A) Liquids tend to have maximum number of molecules at their surface. Reason (R) Small liquid drops have spherical shape. (a) Both A and R are true and R is the correct explanation of A (b) Both A and Rare true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true |
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469 | Kinetic energy of molecules is highest in: A. gases B. solids c. liquids D. solutions |
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470 | Absolute scale of temperature is a consequence of: A. Boyles law B. Charles law c. Gay-Lussacs law D. Grahams law |
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471 | Which of the following pair of gases cannot be separated by diffusion method? ( mathbf{A} cdot S O_{2} ) and ( H_{2} ) B. ( C O_{2} ) and ( N_{2} O ) c. ( N H_{3} ) and ( N_{2} ) D. ( C O_{2} ) and ( H_{2} ) |
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472 | The critical temperature and pressure of ( C O_{2} ) gas are ( 304.2 K ) and 72.9 at ( m ) respectively.what is the radius of ( C O_{2} ) molecules assuming it to behave as Vander Waal’s gas? |
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473 | The density of ( N H_{3} ) at ( 30^{circ} C ) and 5 atm pressure is: A ( cdot 3.417 mathrm{mg} mathrm{L}^{-1} ) в. ( 3.417 g^{-1} L ) c. ( 3.417 g L^{-1} ) D. 3.417 kg L ( ^{-1} ) |
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474 | A real gas most closely approaches the behaviour of an ideal gas at: A . 15 atm and ( 200 K ) B. 1 atm and ( 273 mathrm{K} ) c. 0.5 atm and ( 500 K ) D. 15 atm and ( 500 K ) |
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475 | ( 7 g ) of nitrogen occupies a volume of 5 litres under certain conditions. Under the same conditions one mole of a gas, having molecular weight ( 56, ) occupies a volume of ? A ( .40 L ) B. ( 20 L ) c. ( 10 L ) D. ( 80 L ) |
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476 | At ( 27^{circ} C, ) most probable speed of methane gas is ( X mathrm{m} / mathrm{s} ), then select the correct statement. A. R.M.S speed of ( O_{2} ) at 300 K is ( x ) m/s B. R.M.S speed of ( O_{2} ) at ( 400 mathrm{K} ) is ( mathrm{Xm} / mathrm{s} ) C. R.M.S speed of ( O_{2} ) at 500 K is ( x ) m/s D. R.M.S speed of ( O_{2} ) at ( 600 mathrm{K} ) is ( mathrm{Xm} / mathrm{s} ) |
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477 | The nature of inter-molecular forces among benzene molecule is: A. hydrogen bonding B. dispersion forces c. dipole-dipole attraction D. ion-dipole attraction |
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478 | The given figure shown the Maxwell distribution of molecular speeds of gas at three different temperatures ( boldsymbol{T}_{1}, boldsymbol{T}_{2} ) and ( T_{3} . ) The correct order of temperature is : ( mathbf{A} cdot T_{1}>T_{2}>T_{3} ) В. ( T_{1}>T_{3}>T_{2} ) ( mathbf{c} cdot T_{3}>T_{2}>T_{1} ) D. ( T_{2}>T_{3}>T_{1} ) |
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479 | The statement that is not correct is : A. Van der Waals constant ‘a’ measures extent of intermolecular attractive forces for real gases B. Boyle point depends on the nature of real gas C . compressibility factor measures the deviation of real gas from ideal behaviour D. critical temperature is the lowest temperature at which liquefaction of a gas first occurs |
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480 | 4. A student placed two footballs of the same size and made of the same material in two pans of a balance (see figure). Football Football Which of the following is true? (a) both balls have same volume of air (b) both balls have same mass of air c) air in ball A is more compressed than in ball B (d) all the above are correct |
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481 | que li that there is no 0.31 One of the assumptions of kinetic theory of gases is that there is no force of attraction between the molecules of a gas. State and explain the evidence that shows that the assumption is not applicable for real gases. |
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482 | The kinetic energy of ( 2.8 g ) of nitrogen ( operatorname{gas} operatorname{at} 127^{circ} C ) is nearly A ( .2 times 249.3 J ) В. ( 2 times 200.4 J ) C . ( 2 times 25 J ) D. ( 20.5 J times 2 ) |
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483 | Under 3 atm, 12.5 litre of a gas weighs 15 gm. What will be the average speed of gaseous molecules? A ( cdot 8.028 times 10^{4} mathrm{cm} / mathrm{sec} ) B. ( 6.028 times 10^{2} mathrm{cm} / mathrm{sec} ) c. ( 8.028 times 10^{5} mathrm{cm} / mathrm{sec} ) D. ( 6.028 times 10^{4} mathrm{cm} / mathrm{sec} ) |
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484 | For a given gas ( T_{c}=40 mathrm{K} ) hence, ( T_{i} ) is: A . ( 40 mathrm{k} ) в. 270 к ( c cdot 135 k ) D. 540 K |
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485 | Explain ion-dipole interaction with suitable example. | 11 |

486 | Which of the following are the properties of solid? A. They have a definite shape B. They have distinct boundaries c. They have fixed volume D. All of the above |
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487 | The ratio of the pressure exerted by the oxygen gas to the pressure exerted by the hydrogen gas is: A . 6: 1 B. 5: 1 c. 4: 1 D. 1: 1 E . 1: 5 |
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488 | Under 3 at ( m, 12.5 ) litres of a certain gas weighs 15 g. The average speed of gaseous molecules is ( x times 10^{4} mathrm{cm} ) sec ( ^{-1} ) Value of ( x ) is…… (only integer part) |
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489 | What are the main postulates of kinetic molecular theory of gases? | 11 |

490 | At ( 100^{circ} mathrm{C} ) and 1 atm, if the density of liquid water is ( 1.0 g mathrm{cm}^{-3} ) and that of water vapour is ( 0.0006 g mathrm{cm}^{-3}, ) then the volume occupied by water molecules in 1 litre of steam at that temperature is: ( A cdot 6 c m^{3} ) B. ( 60 mathrm{cm}^{3} ) c. ( 0.6 mathrm{cm}^{3} ) D. ( 0.06 mathrm{cm}^{3} ) |
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491 | The vander waals constants for ( boldsymbol{H} boldsymbol{C l} ) are a ( 371.843 K P a ) and ( b=40.8 mathrm{cm}^{3} m o l^{-1} ) Choose the correct options: A. The critical pressure is ( 8.273 mathrm{MPa} ) B. The critical temperature is ( 224.8 K ) C. The critical volume is ( 122.4 mathrm{cm}^{3} ) D. The critical temperature is ( 324.8 K ) |
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492 | Which of the following assumptions is incorrect according to kinetic theory of gases? A. Particles of a gas move in all possible directions in straight lines B. All the particles, at any particular time, have same speed and same kinetic energy C. There is no force of attraction between the particles of a gas at ordinary temperature and pressure D. The actual volume of the gas is negligible in comparison to the empty space between them |
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493 | Q7. What is Boyle Temperature? | 11 |

494 | The pressure exerted by real gas is: A. Lower than ideal gas B. More than ideal gas C. Equal to ideal gas D. Can’t be calculated. |
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495 | What will be the ratio of molar capacities for monoatomic gas ( left(C_{v}=3right. ) )? A . 1.66 B . 2. ( c .6 . ) D. 1.5 |
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496 | The existence of intermolecular forces is supported by the facts: A. Non ideality of real gases B. Liquefaction of gases c. Both (a) and (b) D. None of these |
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497 | Of which of the following colloidal systems, fog is an example : A. liquid dispersed in gas B. gas dispersed in gas c. solid dispersed in gas D. solid dispersed in liquid |
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498 | Gas assumes the shape and volume of its container A . True B. False |
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499 | The ratio between the ( boldsymbol{R} boldsymbol{M} boldsymbol{S} ) velocity of ( H_{2} ) at ( 50 K ) and ( R M S ) velocity of ( O_{2} ) at ( 800 K ) will be: A . 4: B. 2: c. 1: D. 1: |
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500 | The vapour pressure of a moist gas at ( 100^{circ} mathrm{C} ) is ( 750 mathrm{mm} ) and the aqueous tension at the same temperature is 10 mm. The vapour pressure of the dry gas is : ( A cdot 750 mathrm{mm} ) B. 760 mm c. ( 740 mathrm{mm} ) D. 720 mm |
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501 | Among the following which one shows that the total pressure of a mixture of gases is equal to the sum of the partial pressure of the component gases. A. ( vee / T=k ) B. Р/T=k c. ( P V=k ) D. ( P_{T}=P_{1}+P_{2}+P_{3} ) E . PT=k |
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502 | Which nature of matter is shown when salt dissolves in water completely? A. wave B. Particle c. Both A and B D. None of the above |
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503 | When the temperature is raised, viscosity of the liquid decreases. This is because: A. volume of the solution decreases B. increase in temperature increases the average kinetic energy of the molecules which overcomes the attractive forces between them C. covalent and hydrogen bond forces decreases D. attraction between the molecule increases. |
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504 | Assertion: The rate of diffusion is greater in case of gases than in liquids. Reason: The intermolecular forces of attraction are stronger in gases than in liquids. |
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505 | The state of matter in which inter- particle attraction is weak and inter- particle space is so large that the particles become free to move randomly in the entire space is known as: A. solid B. liquid c. gas D. Both A and B |
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506 | A balloon is filled with gas. The gas occupies the whole space because A. the gas is highly compressible B. the particles of gases are free to move c. the particles of gases are held by weak intermolecular forces D. Both B and C |
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507 | Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas? A. The area under the distribution curve remains same as under the lower temperature B. The distribution becomes broader. c. The fraction of the molecules increases with the most probable speed. D. The most probable speed increases. |
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508 | Q.52 Why does the boundary between liquid phase and g disappear on heating a liquid unto critical temperature in a closed vessel? In this situation what will be the state of the substance: point fie critical |
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509 | In cold countries, ethylene glycol is used in car radiators for both winter as well as summer seasons.Which of the following principle is involved here? A. Depression of freezing point B. Elevation of boiling point c. Decrease in rate of evaporation D. All the above |
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510 | Arrange the following substances in increasing order of forces of attraction. A. Oxygen, water, sugar B. Sugar, water, oxygen c. water, sugar, oxygen D. Sugar, oxygen, water |
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511 | Q5. What is the unit of coefficient of viscosity? | 11 |

512 | Which of the assumptions of the kinetic-molecular theory best explains the observations that a gas can be compressed? A. Gas molecules move at random with no attractive forces between them B. The velocity of gas molecules is proportional to their kelvin temperature c. The amount of space occupied by a gas is much greater than the space occupied by the actual gas molecules D. In collisions with the walls of the container or with other molecules, energy is conservedd |
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513 | The molecules of which of the following gas have higher speed? A . Hydrogen at ( -50^{circ} mathrm{C} ) B. Methane at ( 298 K ) c. Nitrogen at ( 1000^{circ} mathrm{C} ) D. Oxygen at ( 0^{circ} mathrm{C} ) |
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514 | At what temperature would the rms speed of a gas molecule have twice its value at ( 100^{circ} mathrm{C} ? ) A ( .4192 K ) в. ( 1492 K ) c. ( 9142 K ) D. 2491 K |
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515 | 120.00 UU Q5. The pressure of a mixture of H, and N, in a container is 1200 torr. The partial pressure of nitrogen in the mixture is 300 torr. What is the ratio of H, and N, molecules in the mixture? Ans. Total pressure of mixture – 1200 to |
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516 | The ( p H ) of pure water at ( 25^{circ} C ) and ( 60^{circ} C ) are 7 and 6.5 respectively. HCl gas is passed through water at ( 25^{circ} mathrm{C} ) till the resulting 1 litre solution aquires a ( p H ) of 3. Now ( 4 times 10^{-3} ) mole of ( N a C N ) are added into this solution. Also a fresh ( 0.1 M H C N ) solution has ( p H 5.1936 ) Now in the one part of solution obtained after addition of ( N a C N ), one millimole of ( N a O H ) are added and in the second part of this solution 0.5 miili mole of ( H C l ) are added. The volume of ( H C l ) passed through the |
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517 | At ( 300 mathrm{K}, ) the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen ( left(N_{2}right) ) at 4 bar. The molar mass of gaseous molecule is : A ( cdot 112 g ) mol ( ^{-1} ) B . ( 224 g ) mol ( ^{-1} ) c. ( 28 g ) mol ( ^{-1} ) D. ( 56 g ) mol( ^{-1} ) |
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518 | Assertion If ( boldsymbol{H}_{2} ) and ( boldsymbol{C l}_{2} ) enclosed separately in the same vessel exert pressure of 100 and 200 mm respectively, their mixture in the same vessel at the same temperature will exert a pressure of ( 300 m m ) Reason Dalton’s law of partial pressures states that total pressure is the sum of partial pressures. Read the above assertion and reason and choose the correct option regarding ¡t. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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519 | Select the correct statement: This question has multiple correct options A. The value of compressibility factor ( ^{prime} Z^{prime} ) for ( H_{2} ) gas is greater than one at room temperature and pressure B. The real gas behaves as an ideal gas at Boyle’s temperature. C. For a real gas following van der Waals’ equation of state, the expression of critical temperature is ( frac{8 a}{27 R . b} ) D. At low pressure, the compressibility factor ( ^{prime} Z^{prime}=1+ ) ( frac{P . b}{R T} ) for a van der Waals’ gas |
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520 | (U TU 3. hown below is venn diagram directing different states of Show ter Which of the following can be placed at place shown as ‘Q’ in the diagram? Solid pinb Gas (a) Dryice (c) Jelly (b) Table salt (d) Water |
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521 | If helium effuses through a porous barrier at a rate of 4.0 moles per minute, at what rate (in moles per minute) would oxygen gas diffuse? A . 0.20 B. 0.50 ( c cdot 2.0 ) D. 1.4 |
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522 | 0.38 Explain the effect of increasing the temperature of a liquid, on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased? |
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523 | Consider the distribution of speeds of molecules as shown in figure Which is correct ordering for speeds? A ( . V_{r m s}<V_{a v g}<V_{m p} ) B. ( V_{r m s}<V_{m p}<V_{a v g} ) ( mathbf{C} cdot V_{a v g}<V_{r m s}<V_{m p} ) ( mathbf{D} cdot V_{m p}<V_{a v g}<V_{r m s} ) |
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524 | ( C l_{2} O ) is a yellowish-red gas at room temperature. The strongest intermolecular forces present in ( C l_{2} O ) are: A. dipole-dipole forces B. landon forces c. hydrogen bonds D. covalent bonds |
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525 | Statement 1: The ideal gas law does not hold under low temperatures and high pressure. Statement 2: Interactions between particles cannot be neglected under these conditions. A. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement1 B. Both the Statement 1 and Statement 2 are correct, but Statement 2 is not the correct explanation of Statement 1. c. statement 1 is correct, but statement 2 is not correct D. Statement 1 is not correct, but Statement 2 is correct |
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526 | 13. The temperature dependence of the surface tension of a TY liquid is given by the Sugden equation, y Select correct statement(s). (a) Surface tension approaches zero as critical tem- perature is attained, i.e. at T = T. (b) Plot of log y against log 1- 1- is linear with a slope equal to n and an intercept equal to log You (c) At reduced temperature equal to 1, surface disappears and y=0 (d) log y decreases on increasing log T |
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527 | Two closed bulbs of equal volume (v) containing an ideal gas initially at pressure ( P_{4} ) and temperature ( T_{1} ) are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to ( T_{2} ). What is the final pressure ( boldsymbol{P}_{f} ? ) |
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528 | The critical temperature of a gas is the temperature: A. above which it can no longer remain in the gaseous state B. above which it cannot be liquefied by pressure C. at which it solidifies D. at which the volume of the gas becomes zero |
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529 | Assertion If ( boldsymbol{H}_{2} ) and ( boldsymbol{C l}_{2} ) enclosed separately in the same vessel exert pressures of 100 and ( 200 mathrm{mm} ) respectively, their mixture in the same vessel at the same temperature will exerts a pressure of ( 300 mathrm{mm} ) Reason Dalton’s law of partial pressures states that total pressure is the sum of partial pressures. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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530 | Assertion Helium shows only positive deviations from ideal behaviour. Reason Helium is an inert gas. |
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531 | Gas particles vibrate about A. their mean positions B. any direction c. both of above D. none of these |
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532 | 600 K Q. 39 The variation of pressure with volume of the gas at different temperatures can be graphically represented as shown in figure. On the basis of this graph answer the following questions. (i) How will the volume of a gas change if its pressure is increased at constant temperature? (ii) At a constant pressure, how will the volume of a gas change if the temperature is increased from 200 K to 400 K? Pressure (bar) 400 K 200 K Volume (dm)– |
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533 | If the compression factor of a gas is more than unity at ( S T P ), then the value of ( V_{m} ) is: A . greater than ( 22.4 d m^{3} ) B. lesser than ( 22.4 d m^{3} ) c. equal to ( 22.4 d m^{3} ) D. dependent on its molecular mass |
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534 | The volume occupied by 11 grams of ( C O_{2} ) gas at STP is: A . ( 5.6 l ) B. ( 11.2 l ) c. ( 22.4 l ) D. ( 44.8 l ) |
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535 | Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is: A. more than unit electronic charge B. equal to unit electronic charge c. less than unit electronic charge D. double the unit electronic charge |
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536 | Solids, liquids and gases can diffuse into A. solids B. liquids c. gases D. plasma |
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537 | Assertion ( boldsymbol{S} boldsymbol{O}_{2} ) gas is easily liquefied while ( boldsymbol{H}_{2} ) gas is not Reason ( boldsymbol{S} boldsymbol{O}_{2} ) has low critical temperature while ( boldsymbol{H}_{2} ) has high critical temperature. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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538 | The total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of ( 1 d m^{3} ) at ( 27^{circ} C ) is : ( left(R=0.083 text { bar } d m^{3} K^{-1} m o l^{-1}right) ) A . 44.02 bar B . 35.35 bar c. 56.025 bar D. 42.39 bar |
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539 | Q. 33 The critical temperature (.) and critical pressure (pc) of CO2 are 30.98°C and 73 atm respectively. Can CO, (g) be liquefied at 32°C and 80 atm pressure? of co mae are 30 98°C and 73 atm |
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540 | Compressibility factor for ( boldsymbol{H}_{2} ) behaving as real gas is : ( A ) В ( cdotleft(1-frac{a}{R T V}right) ) c. ( left(1+frac{P b}{R T}right) ) D. ( frac{R T V}{(1-a)} ) |
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541 | A flask containing air (open to atmosphere) is heated from ( 300 K ) to ( mathbf{5 0 0 K} . ) The percentage of air escaped to the atmosphere is nearly? A . 16.6 B. 40 c. 60 D. 20 |
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542 | Assertion: All molecules in a gas have same speed. Reason: Gas contains molecules of different size and shape. Choose the appropriate option. A. If both assertion and reason are true and the reason is a correct explanation of the assertion. B. If both assertion and reason are true, but reason is not a correct explanation of the assertion. c. If the assertion is true, but reason is false. D. If both the assertion and reason are false |
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543 | If K.E. of an electron, ( alpha- ) particle and a proton are represented by ( boldsymbol{E}_{1}, boldsymbol{E}_{2} ) and ( boldsymbol{E}_{3} ) respectively (provided all these have same de Broglie wavelength) then A ( . E_{1}=E_{2}=E_{3} ) в. ( E_{1}>E_{2}>E_{3} ) c. ( E_{1}>E_{3}>E_{2} ) D. ( E_{2}>E_{3}>E_{1} ) |
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544 | Q.5 Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is (a) more than unit electronic charge (b) equal to unit electronic charge (C) less than unit electronic charge (d) double the unit electronic charge |
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545 | Which is the correct order for different forces? ( mathbf{A} cdot E_{D} ) (Dipole – induced dipole interaction) ( >E_{x} ) (Dipole induced dipole interaction) ( >E_{L} ) (London force) B. ( E_{K} ) (Dipole ( _{-} ) dipole interaction) ( >E_{D} ) (Dipole – induce dipole interaction) ( >E_{L} ) (London force) C . ( E_{D} ) (Dipole – induced dipole interaction) ( >E_{L} ) (London force) ( E_{K} ) (Dipole – Dipole interaction) D. All forces are equally strong. |
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546 | Assertion The fraction of molecules having speed in the range ( u ) and ( (u+d u) ) of a gas of molar mass ( M ) at temperature ( T ) is the same as that of gas of molar mass of ( 2 M ) and temperature ( 2 T ) Reason The fraction of molecules having their speed within the range ( u ) to ( (u+d u) propto ) ( frac{M}{T} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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547 | When applied to law of combining volumes, which of the following is correct about Berzelius hypothesis? a) it predicts atoms are indivisible b)it predicts atoms are divisible c)it is contrary to Dalton’s hypothesis A. Only a B. Only c. Both a and ( c ) D. Both b and c |
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548 | The total ( K E ) of an ideal monoatomic ( operatorname{gas} operatorname{at} 27^{circ} mathrm{C} ) is : A. 900 call ( l ) B. 1800 cal c. 300 call ( l ) D. None |
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549 | If the critical temperature of a gas is ( 100 mathrm{K} ) then its Boyle temperature will be: A . 33.3 ( k ) B. ( 103 mathrm{K} ) c. 337 к D. 500 K |
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550 | 2. An isochoric process takes place at constant (a) temperature (b) pressure (c) volume (d) concentration |
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551 | The three phases of water (Solid, Liquid, Gas) are: A . ice, water, steam B. water, ice, steam c. steam, ice, water D. steam, water, ice |
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552 | Boyle’s law may be expressed as ( (boldsymbol{d} boldsymbol{P} / boldsymbol{d} boldsymbol{V})_{boldsymbol{T}}=-boldsymbol{K} / boldsymbol{V}^{2} ) If true enter 1 else 0 A. |
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553 | ( 100 c m^{3} ) of ( N H_{3} ) diffuses through a pin hole in 32.5 second. How much time(in seconds) will ( 60 c c ) of ( N_{2} ) take to diffuse under same condition? |
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554 | The ( r . m . s . ) velocity of hydrogen is ( sqrt{7} ) times the ( r . m . s . ) velocity of nitrogen. If ( boldsymbol{T} ) is the temperature of the gas: ( mathbf{A} cdot Tleft(H_{2}right)=Tleft(N_{2}right) ) B ( cdot Tleft(H_{2}right)>Tleft(N_{2}right) ) C ( cdot Tleft(H_{2}right)<Tleft(N_{2}right) ) D. ( Tleft(H_{2}right)=sqrt{7} Tleft(N_{2}right) ) |
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555 | Which term is caused by the random movement of electrons in molecules? A. lonic Bonding B. Metallic Bonding c. Hydrogen Bonding D. London Dispersion Forces |
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556 | The densities of air at ( 25^{circ} mathrm{C} ) and ( 100^{circ} mathrm{C} ) ( operatorname{are} 1.2 g L^{-1} ) and ( 0.9 g L^{-1} ) respectively Assuming that the air obey’s Charle’s law the value of absolute zero of temperature in degree Celsius is: B . ( 200^{circ} mathrm{C} ) ( mathrm{c} cdot-200^{circ} mathrm{C} ) D. ( 0^{circ} mathrm{C} ) |
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557 | Under what conditions gases generally deviate from ideal behaviour? A. At high temperature and low pressure B. At low temperature and high pressure c. At high temperature and high pressure D. At low temperature and low pressure |
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558 | The value of ( Z_{c} ) at ( T_{c}, P_{c} ) and ( V_{c} ) is ( frac{3}{x} ) Value of ( x ) is |
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559 | ( mathbf{A} ) ( 0.5 d m^{3} ) flask contains gas ( A ) and 1 ( d m^{3} ) flask contains gas ( B ) at the same temperature. If density of ( boldsymbol{A}=mathbf{3} boldsymbol{g} / boldsymbol{d} boldsymbol{m}^{3} ) and that of ( B=1.5 g / d m^{3} ) and the molar mass of ( boldsymbol{A}=mathbf{1} / mathbf{2} ) of ( boldsymbol{B}, ) the ratio of pressure exerted by gases is: ( ^{A} cdot frac{P_{A}}{P_{B}}=2 ) в. ( frac{P_{A}}{P_{B}}=1 ) c. ( frac{P_{A}}{P_{B}}=4 ) D. ( frac{P_{A}}{P_{B}}=3 ) |
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560 | The velocity of sound in a gas is ( 30 m s^{-1} ) at ( 27^{circ} C . ) What is the velocity of the sound in the same gas at ( 127^{circ} mathrm{C} ) ? A ( cdot 20 m s^{-1} ) B. ( 30 m s^{-1} ) D. ( 60 m s^{-1} ) |
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561 | Assertion: The volume of 1 mole of an ideal gas at 1 bar pressure at ( 25^{0} C ) is ( 24.78 mathrm{L} ) Reason: 1 bar ( =0.987 ) atm A. Both Assertion and reason are correct and reason is correct explanation of Assertion B. Both assertion and reason are correct but reason is not correct explanation of assertion c. Assertion is correct but reason is incorrect D. Assertion is incorrect but reason is correct |
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562 | 2. Properties shown by gases among the following Diffusion, definite shape, definite volume, regidity high kinetic energy, Fluidity |
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563 | The average velocity of gas molecules is ( 400 mathrm{m} / mathrm{sec} . ) Calculate its (rms) velocity at the same temperature: |
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564 | Which of the following is/are true statement(s)? A. A given substance may simultaneously exist in all three states. B. Water exists in all three phases simultaneously. C. The temperature at which all the three phases of the same substance exist simultaneously is called triple point D. All of the above. |
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565 | If ( P, V, T ) represents pressure, volume and temperature of the gas, the correct representation of Boyle’s law is : A ( cdot V propto frac{1}{P}(mathrm{P} text { is constant }) ) В. ( P V=R T ) ( ^{mathrm{c}} cdot_{V} propto frac{1}{P}(text { at constant } mathrm{T}) ) D. ( P V=n R T ) |
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566 | A closed bulb capacity 200ml containing ( boldsymbol{C H}_{4}, boldsymbol{H}_{2} ) and He at ( 300 mathrm{K} ) The ratio of partial pressure of ( boldsymbol{C} boldsymbol{H}_{4}, boldsymbol{H}_{2} ) and He, respectively is 2:3:5. Calculate the ratio of their weights present in the container. A. 2: 4: 6 B . 16: 8: 100 ( c cdot 16: 3: 10 ) D. 4:9:25 |
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567 | A curve drawn at constant pressure is called an isobar and shows relationship between: A ( cdot V ) and ( frac{1}{T} ) B. ( V T ) and ( V ) c. ( T ) and ( V ) D. ( quad P ) and ( frac{1}{V} ) |
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568 | Q. 27 The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension: Water, alcohol (C2H5OH) and hexane [CH3 (CH2)CH3)]. Ane In the above qivon molecular anli havana OL 1 |
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569 | Q. 22 What will be the molar volume of nitrogen and argon at 273.15 K and 1 atm? |
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570 | Kinetic energy of monoatomic gas at ( 300 mathrm{K} ) in ( mathrm{kJ} ) is: A . 3.74 B. 348 c. 34.8 D. 3.48 |
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571 | State True or False. According to Charles’ law, A. True B. False |
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572 | The volume of helium is ( 44.8 ~ L ) at: A ( cdot 100^{circ} mathrm{C} ) and 1 atm B. ( 0^{circ} mathrm{C} ) and 1 atm c. ( 0^{circ} mathrm{C} ) and 0.5 atm D. ( 100^{circ} mathrm{C} ) and 0.5 atm |
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573 | Kinetic energy of gas depends on: A. temperature B. pressure c. surface area D. both ( A ) and ( B ) |
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574 | Q2. A certain amount of a gas at 27°C and 1 bar pressure occupies a volume of 25 m. If the pressure is kept constant and the temperature is raised to 77°C, what will be the volume of the gas? 173 72 200 |
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575 | The main reason for deviation of gases from ideal behaviour is few assumptions of kinetic theory. These are (i) there is no force of attraction between the molecules of a gas (ii) volume of the molecules of a gas is negligibly small in comparison to the volume of the gas (iii) Particles of a gas are always in constant random motion. A. (i) and (ii) B. (ii) and (iii) C . (i), (ii) and (iii) D. (iii) only |
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576 | Matter is made up of A. wood B. blocks c. particles D. None of the above |
11 |

577 | The attractive forces between polar molecules are between non-polar molecules are forces. A. dipole-dipole, London B. London, dipole-dipole C. induced dipole-induced dipole, London D. London, induced dipole-induced dipole |
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578 | The amount of energy required to change ( 1 k g ) of a solid into liquid at atmospheric pressure at its melting point is known as A. latent heat of fusion B. latent heat of boiling c. latent heat of freezing D. melting energy |
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579 | A balloon contains ( 14.0 L ) of air at 760 torr.. What will be the volume of the balloon when it is taken to a depth of ( 10 f t ) in a swimming pool? Assume that the temperature of the air and water are equal (density: ( boldsymbol{H} boldsymbol{g}= ) ( mathbf{1 3 . 6} boldsymbol{g} / boldsymbol{m} boldsymbol{L} ) A . 11.0 в. 11.3 c. 10 D. 10.8 |
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580 | Estimate the average thermal energy of a helium atom at (i) room temperature ( left(27^{circ} Cright) ) (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a star) |
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581 | A cylinder containing ( boldsymbol{H}_{2} boldsymbol{O}(l) ) and ( N_{2}(g) ) at ( 25^{circ} C ) recorded a pressure of 500 mbar. The volume of cylinder is reduced to half by forcing the piston downward at the same temperature, the new pressure reading would be (aqueous tension ( =23 ) mbar): A. 977 mbar B. 1000 mbar c. 1100 mbar D. 1023 mbar |
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582 | Real gases do not react as expected : A. noble gas B. inert gas c. ideal gas D. non-ideal gas |
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583 | What conclusion would you draw from the following graphs for an ideal gas? This question has multiple correct options A. As the temperature is reduced, the volume as well as pressure increase B. As the temperature is reduced, the volume becomes zero and the pressure reaches infinity C. As the temperature is reduced, the pressure decrease D. A point is reached where, theoretically, the volume become zerc |
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584 | Critical temperature and pressure of a real gas is ( 27^{circ} mathrm{C} ) and 75 atm respectively. The critical volume of 1 mole of real gas is : A. 12.47 litre B. 0.12 litre c. 1.24 litre D. data insufficient |
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585 | Q. 28 Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain pressure of dry gas? |
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586 | f we plot volume of a certain mass of a gas against temperature at constant pressure, we get a straight line intersecting on the negative side at ( -273^{circ} C ) which explains about absolute zero. This graph is known as: A. isochor B. isotherm ( c . ) isotone D. isobar |
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587 | Q.8 Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases. | Gases | H | He | O, N, Critical temperature in Kelvin 33. 2 5 .3 154.3 126 From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first (a) H2, He, O2, N2 (b) He, O2, H, N2 (c) N2, O2, He, H2 (d) O2, N2, H2, He |
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588 | A few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement? A. Water, air, wind B. Air, sugar, oil c. oxygen, water, sugar D. Salt, juice, air |
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589 | The rms speed of hydrogen is ( sqrt{7} ) times the rms speed of nitrogen. If T is the temperature of the gas, then : ( mathbf{A} cdot T_{H_{2}}=T_{N_{2}} ) ( mathbf{B} cdot T_{H_{2}}>T_{N_{2}} ) ( mathbf{c} cdot T_{H_{2}}<T_{N_{2}} ) D. ( T_{H_{2}}=sqrt{7} T_{N_{N}} ) |
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590 | At the same temperature and pressure which of the following gas will have highest ( boldsymbol{K} boldsymbol{E} ) per mole: A. Hydrogen B. Oxygen c. Methane D. All of the above |
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591 | im Whet is ule pulunual energy or a molecule. 62. Modern vacuum pumps permit the pressures down to p = 4X10 au to be reached at room temperatures. Assuming that the gas exhausted is nitrogen, find the number of its molecules per 1 cm’ and the mean distance between them at this pressure. |
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592 | Q. 42 Match the following gas laws with the equation representing them. A. Boyle’s law 1. Von at constant T and p B. Charle’s law 2. Protal = p; + p. + P2 + …at constantTV 940 C. Dalton’s law913 . P pV tant = constant D. Avogadro’s law 4. Voc T at constant n and 5. pocat constant n and T V |
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593 | State in which of the following examples the force of attraction between particles of matter is almost negligible. A. Piece of stone B. Water droplets c. A light gas D. All of the above |
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594 | Gases have fixed shape and volume. A. True B. False |
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595 | A gas has A. definite volume and no definite shape B. definite shape and no definite volume C. definite shape and definite volume D. no definite shape and no definite volume |
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596 | Density of oxygen gas at 1 atm pressure is ( 0.01429 g / c c ) at a given temperature. The ( r m s ) velocity of oxygen is: A. ( 4.612 times 10^{4} mathrm{cm} / mathrm{s} ) B. ( 1.45 times 10^{4} mathrm{cm} / mathrm{s} ) c. ( 4.612 times 10^{3} mathrm{cm} / mathrm{s} ) D. ( 1.35 times 10^{4} mathrm{cm} / mathrm{s} ) |
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597 | The kinetic energy of one mole of hydrogen gas at ( 127^{circ} mathrm{C} ) in cal / mol is A . 30 B. 600 c. 900 D. 1200 |
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598 | When a polyatomic gas undergoes an adiabatic process its temperature and volume are related by the given equation ( T V^{n} ) =constant the value of ( n ) is? |
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599 | Assertion The pressure of a fixed amount of an ideal gas is proportional to its temperature Reason Frequency of collisions and their impact both increase in proportion to the square root of temperature A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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600 | The volumes of two vessels at same temperature are in theratio of ( 2: 3 . ) One vessel contains ( H_{2} ) and other ( N_{2} ) at 600 ( mathrm{mm} ) and ( 900 mathrm{mm} ) respectively. The final pressure when they are connected together is : (Assume that ( N_{2} ) and ( H_{2} ) react to form ( N H_{3} ) ( A cdot 680 mathrm{mm} ) B. 760 mm c. ( 780 mathrm{mm} ) D. 800 mm |
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601 | Jaal Q. 34 For real gases the relation between p. V and T is given by equation V-nb) = nRT an p + where, ‘a’ and ‘b’ are van der Waals’ constants, ‘nb’ is approximately equal to the total volume of the molecules of a gas.’a’ is the measure of magnitude of intermolecular attraction. (i) Arrange the following gases in the increasing order of ‘b’. Give reason. 02, CO2, H2, He (ii) Arrange the following gases in the decreasing order of magnitude of ‘a’. Give reason. CHA, O2, H2 |
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602 | 105 mL of pure water at ( 4^{circ} mathrm{C} ) is saturated with ( N H_{3} ) gas yielding a solution of density ( 0.9 g m L^{-1} ) and containing ( 30 % N H_{3} ) by mass. The volume (in litres) of ( N H_{3} ) gas at ( 4^{circ} C ) and ( 775 mathrm{mm} ) of Hg, which was used to saturate the water is (as the nearest integer): |
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603 | Q Type your question ( A ) ( (a) ) B. ( (b) ) ( mathbf{C} ) ( (c) ) ( D ) ( (d) ) |
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604 | Charle’s law is kept constant only if mass and pressure are kept A. increasing B. decreasing c. consant D. none of these |
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605 | Which of the following molecules does not have net dipole moment? A. ( C H_{3}-B r ) в. ( C H_{2} C l_{2} ) c. ( H_{2} C=C H_{2} ) D. ( H C O O H ) |
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606 | Q1. Give an expression for the van der Waals equation. Give the significance of the constants used in the equation. What are their units? |
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607 | A sample of neon gas is contained by a closed 5-liter vessel. The temperature of container is ( 25^{circ} mathrm{C} ) and pressure is 1.5 atmospheres (R is equal to ( 0.08 mathrm{L} ) ( operatorname{atm} / operatorname{mol} mathrm{K} ) Find the expressions which is equal to the molar quantity of gas in the sample? A ( frac{(1.5)(5.0)}{(0.08)(25)} ) B. ( frac{(0.08)(25)}{(1.5)(5.0)} ) c. ( frac{(1.5)(25)}{(0.08)(5.0)} ) D. ( frac{(0.08)(298)}{(1.5)(5.0)} ) E ( frac{(1.5)(5.0)}{(0.08)(298)} ) |
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608 | The density of ammonia at ( 30^{circ} mathrm{C} ) and 5 atm pressure is: A .3 .42 g/ B. 2.42 g/L c. ( 1.171 g / L ) D. ( 3.84 mathrm{g} / mathrm{L} ) |
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609 | The van der Waal’s parameters for ( operatorname{gases} A, B, C ) and ( D ) are: begin{tabular}{lll} Gas & ( a ) ( left(l i t r e^{2} a t m / m o l^{2}right) ) & ( b(l i t r e / m o l ) ) \ ( A ) & 4.0 & 0.027 \ ( B ) & 8.0 & 0.030 \ ( C ) & 6.0 & 0.032 \ ( D ) & 12.0 & 0.027 \ hline end{tabular} Which one of these gases has the highest critical temperature? ( mathbf{A} cdot A ) ( mathbf{B} cdot B ) ( c cdot C ) D. ( D ) |
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610 | litre of a sample of ( H_{2} ) is at ( 0^{circ} C ) and 1 atm pressure.1 litre of another sample of hydrogen is at ( 0^{circ} mathrm{C} ) and 2 atm pressure. Kinetic energies of the gases are in the ratio of: A ( cdot 1: 2 ) B. 2:1 c. 3: D. 1: |
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