We provide acids, bases and salts practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on acids, bases and salts skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.
List of acids, bases and salts Questions
| Question No | Questions | Class |
|---|---|---|
| 1 | Karthik performed the following experiment by taking a few solutions and phenolphthalein indicator. Identify ( p, q, r ) in his experiment : ( mathbf{A} cdot mathbf{p} rightarrow operatorname{Acid}, mathbf{q} rightarrow operatorname{Acid}, mathbf{r} rightarrow mathbf{B} ) ase B. ( p rightarrow ) Base ( q rightarrow ) Acid, ( r rightarrow ) Base c. ( p rightarrow ) Base, ( q rightarrow ) Base, ( r rightarrow ) Acid D. ( p rightarrow ) Base, ( q rightarrow A c i d, r rightarrow ) Acid | 7 |
| 2 | To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is: A . acidic B. basic c. netural D. corrosive | 7 |
| 3 | Which one of the following types of medicines is for treating indigestion? A. Antibiotic B. Analgesic c. Antacid D. Antiseptic | 7 |
| 4 | Remedies of which of the following are examples of neutralisation in everyday life? This question has multiple correct options A. Ant sting B. Indigestion c. Factory wastes D. None of these | 7 |
| 5 | An indicator which changes its colour from blue to red in acids is litmus solution. A. True B. False | 7 |
| 6 | What is meant by water of crystallization of a substance? Describe an activity to show the water of crystallization. | 10 |
| 7 | 18. Aeld turns litmus paper (b) Yellow (d) None of these | 10 |
| 8 | A restaurant owner has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and the third wants neutral drink. How will the restaurant owner decide which drink is to be served to whom? | 10 |
| 9 | The indicator which shows colour change in the entire pH range is A. phenolphthalein B. methyl orange c. universal indicator D. thymol blue | 7 |
| 10 | Write balanced chemical equations for the reaction between calcium bicarbonate and dilute hydrochloric acid. | 10 |
| 11 | Explain why phenolphthalein is used as an indicator in acid-base titration | 10 |
| 12 | Agent Orange was named so because of A. orange colour B. orange stripe on packet C. production of orange cloud D. killing all greenery | 10 |
| 13 | Which of the following is a use of ( A l(O H)_{3} ? ) A. It is used in fire extinguisher as a foaming agent B. It is used in the preparation of fertilizers c. It is used in removing stains of grease from cloths D. It is used as an antacid | 7 |
| 14 | Explain the action of phenolphthalein indicator in the titration of acetic acid versus sodium hydroxide | 7 |
| 15 | Acid turn blue litmus : A. green B. red c. yellow D. orange | 7 |
| 16 | 31. Formic acid can easily be identi- fied by its : (1) pungent smell (2) repelling smell (3) sweet smell (4) bad smell | 10 |
| 17 | For the growth of plants which of the following top soil is suitable the most: A. Clay soil B. Black soil c. Loam soil D. Sandy soil | 7 |
| 18 | The average oxidation state of chlorine in bleaching power is : A . – B. +1 c. zero D. – -2 as well as +2 | 10 |
| 19 | Four students were given colourless liquids ( A, B, C ) of water, lemon juice and a mixture of water and lemon juice respectively. After testing these liquids with pH paper, following sequence in colour change of pH paper were reported: I. Blue, Red and Green Il. Orange, Green and Green III. Purple, Red and Green IV.Green, Red and Red The correct sequence of colours observed is ( A ) B. II c. ॥॥ D. IV | 7 |
| 20 | Ritu was given four test tubes containing different solutions as shown in figure. Choose the incorrect option. ( A cdot 1 ) and 2 turn blue litmus to red. B. 1 and 4 turn China rose indicator to green C. Phenolphthalein remains colourless with 2 and 3 D. 4 turns turmeric solution to red | 7 |
| 21 | The pH of a carbonated drink is A. less than 7 B. more than 7 c. equal to 7 D. approximately 7.8 | 7 |
| 22 | Which one among the following is strongest acid? A) Dil. ( boldsymbol{H} boldsymbol{C l} ) B) Con. ( boldsymbol{H}_{2} boldsymbol{C O}_{3} ) | 7 |
| 23 | The number of molecules of water of crystallisation present in one molecule of ferrous sulphate is ( mathbf{A} cdot mathbf{5} ) B. 7 ( c .6 ) D. 10 | 10 |
| 24 | 14. Which gas is always produced when a metal reacts with a dilute acid? | 10 |
| 25 | A student prepared solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. since both the solutions are colourless, how will she distinguish between the two? A. Use of china rose B. Use of turmeric c. use of phenolphthalein D. All of the above | 10 |
| 26 | Heated calcium sulphate with half a water of crystallization is commonly called as: A. washing soda B. plaster of paris c. naushadar salt D. bleaching powder | 10 |
| 27 | State one relevant observation for the following. Anhydrous calcium chloride is exposed to air for some time. | 10 |
| 28 | Wasp stings can be treated with: A. baking soda B. vinegar c. washing soda D. milk of magnesia | 7 |
| 29 | An acid base indicator has ( boldsymbol{K} boldsymbol{a}= ) ( 3 x 10^{-5} ) The acid form of indicator is red and the basic form of indicator is blue. By how much must the pH change in order to change the indicator from ( 75 % ) red to 75% blue? A ( cdot 7.91 times 10^{-5} ) B. 0.95 c. ( 5 x 10^{23} ) D. | 10 |
| 30 | Column II give acid and base from which salt mention in column I are formed. Match them correctly. | 7 |
| 31 | Toothpaste is in nature. A. acidic B. basic c. neutral D. Both (A) and (B) | 7 |
| 32 | Sameer took suphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it. What will be the action of gas on moist litmus paper? | 10 |
| 33 | Which of the following is a natural indicator? A. China rosa B. Blueberry C. Morning glory D. All of above | 10 |
| 34 | Formula of the bleaching powder is: ( mathbf{A} cdot C a(O H)_{2} ) в. ( C H C l_{3} ) c. ( C C l_{3} C H O ) D. ( C a O C l_{2} ) | 10 |
| 35 | Assertion In the acid-base titration involving a strong base and a weak acid, methyl orange can be used as an indicator Reason Methyl orange changes its colour in pH range 3 to 5 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 | 10 |
| 36 | Which solution is a conjugate acid/base pair with differing spectral absorbencies? A. Chemical pH indicator B. Acid/base buffer c. Anhydrous solution D. Hypotonic solution E. supersaturated solution | 7 |
| 37 | Which of the following shows differential coloring in acidic and basic solutions? A. Arrhenius acid B. Arrhenius base c. Buffer D. Indicator E. Salt | 7 |
| 38 | Milk of magnesia ( M g(O H)_{2} ) is a/an: A . acid B. antacid c. alkal D. rock salt | 7 |
| 39 | Bleaching powder is obtained by the interaction of ( C l_{2} ) with a: A. dilute solution of ( C a(O H)_{2} ) B. concentrated solution of ( C a(O H)_{2} ) c. dry ( C a O ) D. dry slaked lime | 10 |
| 40 | Substance ( boldsymbol{X} ) (1) reacts with ( boldsymbol{H}_{2} boldsymbol{S} ) to produce white turbidity. (II) changes light green solution of ( F e S O_{4} ) into yellow colour. (III) reacts with moisture to give pungent smelling gas. Hence ( boldsymbol{X} ) is: A. ( K M n O_{4} ) в. ( K_{2} C r_{2} O_{7} ) ( mathrm{c} cdot mathrm{SO}_{2} ) D. ( C a O C l ) | 10 |
| 41 | An organic dye, cosin used to detect end point of precipitation titration by adsorption, is called: A. absorption indicator B. adsorption indicator c. chemical indicator D. none of the above | 10 |
| 42 | Why bee strings are treated by alkaline solutions? A. Because it is basic in nature. B. Because it is acidic in nature. C. Because it is treatable by only alkaline solution. D. None of these. | 7 |
| 43 | Calcium hydroxide (slaked lime) is used in : A. plastics and dyes B. fertilizers c. antacids D. white washing | 7 |
| 44 | Acetic acid is a weak acid. A. True B. False | 7 |
| 45 | Phenolphthalein and methyl orange are themselves: A. weak acid and weak base respectively B. both weak acid c. both weak base D. weak base and weak acid respectively | 7 |
| 46 | In acids, methyl orange turns: A . red B. blue c. green D. yellow | 10 |
| 47 | A solution of which substance can best be used as both titrant and its own indicator in an oxidation-reduction titration? ( mathbf{A} cdot I_{2} ) в. NaOCl c. ( K_{2} C r_{2} O_{7} ) D. ( K M n O_{4} ) | 7 |
| 48 | Indicator is a substance which shows different colors in acidic and basic solutions. A. True B. False | 10 |
| 49 | Bleaching properties of bleaching powder are due it its: A. Oxidizing properties B. Reducing properties c. Basic properties D. Disinfecting properties | 10 |
| 50 | What is the pH range in which phenolphthalein is colourless? ( A cdot O ) to 8 B. 8 to 10 ( c cdot 10 ) to 12 D. 12 to 14 | 7 |
| 51 | Which of the following substances turn blue litmus paper to red? A. Lemonjuice B. Carbonated soft drink c. curd D. All of the above | 7 |
| 52 | For the titration between hydrochloric acid and sodium carbonate, the indicator used is: A. potassium permanganate B. phenolphthalein c. phenol red D. methyl orange | 7 |
| 53 | What type of indicator is phenolphthalein? A . Acidic B. Basic c. Equilibrium (titration) D. Neutral | 7 |
| 54 | Write the chemical name of bleaching powder and write its properties. | 10 |
| 55 | Which is an acidic indicator? A. Phenolphthalein B. Methylorange c. Both ( (A) ) and ( (B) ) D. None of these | 10 |
| 56 | After you have dinner tonight wash your own plate with soap / detergent. (a) What colour change is observed when soap / detergent is applied? (b) Name the type of reaction and explain it. | 10 |
| 57 | Which one of the following is present as an active ingredient in bleaching powder for bleaching action? ( mathbf{A} cdot C a(O C l)_{2} ) в. ( C a O_{2} C l ) c. ( C a C l_{2} ) D. ( C a O C l_{2} ) | 10 |
| 58 | ( begin{array}{ll}text { Indicator } & text { pH range } \ text { Methyl violet } & 0.3-1.8 \ text { Methyl orange } & 2.8-3.8 \ text { Congo red } & 2.8-4.8 \ text { Methyl red } & 3.8-6.1 \ text { Bromothylmol blue } & 6.0-7.9 \ text { Phenol Red } & 6.8-8.6end{array} ) The table above shows the pH ranges of some common indicators. Given that ( K_{a} ) is ( 7.3 times 10^{-10} ) for boric acid ( left(H_{3} B O_{3}right), ) Choose an indicator that can be used for the titration of ( mathbf{0 . 1 0} boldsymbol{M} boldsymbol{K} boldsymbol{H}_{2} boldsymbol{B} boldsymbol{O}_{3} ) with ( mathbf{0 . 1 0} mathbf{M} mathbf{~ H C l} ) A. Methyl orange B. Congo Red C. Methyl Red D. Phenol Red | 7 |
| 59 | Which of the following compounds act as both acid and base? A. ( N a H C O_{3} ) в. ( A l_{2} O_{3} ) ( c cdot C a O ) D. ( M g O ) | 7 |
| 60 | State the function of ( boldsymbol{N a O H} ) | 7 |
| 61 | Methyl orange gives red colour in A. ( K O H ) solution B. HCI solution c. ( N a_{2} C O_{3} ) solution D. ( N a C I ) solution | 10 |
| 62 | State for what purpose is bleaching powder is used in water treatment plant. | 10 |
| 63 | Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form. A. True B. False | 10 |
| 64 | Assertion Phenolphthalein is used as indicator during the titration of oxalic acid against sodium hydroxide. Reason The pH range of phenolphthalein is from ( 8 operatorname{tog} .6 ) Choose the correct option. 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 | 10 |
| 65 | Slaked lime reacts with chlorine to give: ( mathbf{A} cdot C a C l_{2} ) в. ( C a O ) ( mathbf{c} cdot C a(O C l)_{2} ) D. ( C a C O_{3} ) | 10 |
| 66 | One drop of methyl orange solution when added to the solution obtained after electrolysis of a concentrated solution of ( N a C l ) with ( P^{+} ) electrodes, the colour of the solution will turn: A . orange B. pink c. yellow D. colourless | 7 |
| 67 | A solution turns methyl orange pink. It can turn the universal indicator to: A . violet B. blue c. orange D. green | 10 |
| 68 | Which property is common between vinegar and curd? A. Have sweet taste B. Have bitter taste c. Are tasteless. D. Have sour taste | 7 |
| 69 | From which plant is litmus paper or litmus solution obtained? A. Moss B. Rose c. Hibiscus D. Lichen | 10 |
| 70 | Which acids/ bases are used for the following? (i) To neutralize sting of wasps (ii) In alkaline batteries (iii) Manufacturing of soap A ( cdot ) (i) ( C H_{3} C H O ) (ii) ( C s O H ) (iii) ( C a(O H)_{2} ) B . (i) ( C H_{3} C O O H ) (ii) ( C u S O_{4} ) (iii) ( B a(O H)_{2} ) c. ( left(text { i) } C H_{3} text { COOH (ii) } K O H text { (iii) } N a O Hright. ) D. None of these | 7 |
| 71 | Glauber’s salt is: A. hepta hydrate B. deca hydrate C. penta hydrate D. dihydrate | 10 |
| 72 | The colour of methyl orange indicator in an acid solution is | 10 |
| 73 | A red litmus paper when dipped in an aqueous solution of potassium acetate turned blue. Arrange the following steps in proper sequence to explain the above observation. (a) Identification of spectator ions. (b) Identification of free ions which caused the colour change of the litmus paper. (c) Identification of positive and negative radicals. (d) Writing the net reaction taking place (e) Writing ionic equation for the reaction of positive and negative radicals with water. ( A cdot c ) e a d ( b ) B. ( c ) a e d b ( c cdot e a d c b ) D. e ca d b | 7 |
| 74 | Which of the set of oxides are arranged in the proper order of basic, amphoteric, acidic? A. ( S O_{2}, P_{2} O_{5}, C O ) ( mathrm{c} cdot operatorname{Si} mathrm{O}_{2}, mathrm{CaO}, mathrm{Al}_{2} mathrm{O}_{3} ) D. ( C O_{2}, A l_{2} O_{3}, C O ) | 7 |
| 75 | Complete the following acid-base reactions and name the products: (i) ( C H_{3} C H_{2} C H_{2} N H_{2}+H C l rightarrow ) ( (mathrm{ii})left(C_{2} H_{5}right) N+H C l rightarrow ) | 7 |
| 76 | The acid that can be used as a hypnotic is : A. tartaric acid B. benzoic acid c. barbituric acid D. butanoic acid | 7 |
| 77 | What parameter does an indicator changes, with change in the nature of the solution? A. colour B. Odour c. Both D. None of these | 7 |
| 78 | What are indicators? Name any two natural and two synthetic indicators. | 10 |
| 79 | A yellow curry stain on a white shirt turns red when it is washed with soap. Explain why? | 10 |
| 80 | The different colours of litmus in acidic, neutral and basic solutions are respectively: A. red, orange and blue B. blue, violet and red c. red, colourless and blue D. red, violet and blue | 10 |
| 81 | Water is a neutral substance what coloure will you get when you add few drops of universal indicator to a test tube containing distilled water. | 10 |
| 82 | Which of the following is used as washing soda and for softening hard water? A. Sodium carbonate B. Calcium hydroxide c. Sodium hydrogen carbonate D. Magnesium hydroxide | 7 |
| 83 | Which is false for the following reaction? ( left[boldsymbol{C u}left(boldsymbol{H}_{2} boldsymbol{O}right)_{3} boldsymbol{O} boldsymbol{H}right]^{+}+ ) ( left[begin{array}{c}left.boldsymbol{A l}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{3+} longrightarrowleft[boldsymbol{C u}left(boldsymbol{H}_{2} boldsymbol{O}right)_{4}right]^{2+}+end{array}right. ) ( left[begin{array}{c}left.boldsymbol{A l}left(boldsymbol{H}_{2} boldsymbol{O}right)_{5} boldsymbol{O} boldsymbol{H}right]^{2+} \ Dend{array}right. ) This question has multiple correct options ( A . A ) is base and ( B ) is acid B. ( C ) is conjugate acid of ( A ) c. ( B ) is conjugate acid of ( D ) D. ( B ) is conjugate base of ( D ) | 7 |
| 84 | Vinegar is a solution of : A. ( 50 %-60 % ) acetic acid in alcohol B. 5 % – 8 % acetic acid in alcohol C. ( 5 %-8 % ) acetic acid in water D. 50 % – 60 % acetic acid in water | 7 |
| 85 | pH of ( 0.1 mathrm{M} ) solution of ( N a A ) (sodium salt of a weak acid ( H A ) ) is 8.92 Calculate ( p K_{a} ) of ( H A ). If a drop of HPh | 10 |
| 86 | Blue litmus turns red when added to a/an: A . acid B. base c. oil D. none of the above | 10 |
| 87 | Which of the following exhibits different colors in acidic and basic solutions? A. Buffer B. Indicator C. Arrhenius acid D. Arrhenius base E. Neutral condition | 7 |
| 88 | Pick out the correct statement(s) above a universal indicator. This question has multiple correct options A. It is a mixture of some indicators. B. It shows the change in colour at different pH with altogether different colours for a change in pH by units C. Phenolphthalein is an universal indicator. D. a mixture of methyl red, ( alpha ) -naphthol, phthalein blue shows different colours between pH range 4 to 11 | 10 |
| 89 | ( boldsymbol{C H}_{3} boldsymbol{C O O H} ) is a: A. reducing agent B. dehydrating agent c. drying agent D. pickling agent | 7 |
| 90 | Which of the following is a weak acid? A. ( mathrm{H}_{2} mathrm{Te} ) в. ( mathrm{H}_{2} mathrm{Se} ) c. ( mathrm{H}_{2} ) D. ( mathrm{H}_{2} mathrm{Po} ) | 10 |
| 91 | Write chemical name of bleaching powder. Which gas is released when it is exposed to air? Write chemical reaction involved in preparation of bleaching powder. | 10 |
| 92 | Give two important uses of washing soda and baking soda. | 7 |
| 93 | Explain why: (a) An antacid tablet is taken when you suffer from acidity. (b) Calamine solution is applied on the skin when an ant bites. (c) Factory waste is neutralised before disposing it into the water bodies. | 7 |
| 94 | 59. The acid and water in two ves- sels A and B are in the ratio 4 : 3 and 2 : 3. In what ratio should the liquids in both the vessels be mixed to obtain a new mixture in vessel C containing half acid and half water? (1) 7:5 (2) 5:7 (3) 7:3 (4) 5:3 | 10 |
| 95 | Acids combine with bases to form: A. colour and gas B. salt and water c. water and heat D. steam and crystals | 7 |
| 96 | Which of the following base is used for cleaning and commonly known as lye? ( mathbf{A} cdot C a(O H)_{2} ) в. ( N a O H ) c. КОН D. All of the above | 7 |
| 97 | Soft drinks contains: A . acetic acid B. tartaric acid c. carbonic acid D. nitric acid | 7 |
| 98 | 35. Which among the following is not correctly paired ? (1) Formic acid – Vinegar (2) Lactic acid – Milk (3) Citric acid – Lemon (4) Butyric acid – Rancid butter | 10 |
| 99 | Vinegar contains which organic acid? A. Vanillic acid B. Lactic acid c. Oxalic acid D. Acetic acid | 7 |
| 100 | Write a balanced chemical equation for the following. Action of dilute hydrochloric acid on magnesium sulphate. | 7 |
| 101 | The water of crystallisation is the fixed number of one formula unit of salt A. hydrogen B. water c. oxygen D. hydroxide | 10 |
| 102 | A solution of potassium chloride has no effect on litmus whereas, a solution of zinc chloride turns the blue litmus red. Give a reason. | 7 |
| 103 | ( P ) is produced by the action of chlorine on dry slaked lime. Q is a non-corrosive base and used for faster cooking. On heating ( R ) at ( 373 K ), it becomes calcium sulphate hemihydrate. Identify ( P, Q ) and ( R ) respectively: A ( cdot C a O C l_{2}, N a H C O_{3}, ) gypsum в. ( C a O, N a_{2} C O_{3}, C a O C l_{2} ) ( mathbf{c} cdot operatorname{Ca}(O H)_{2}, operatorname{NaH} C O_{3}, operatorname{CaSO}_{4} ) D. ( operatorname{CaOCl}_{2}, N a_{2} mathrm{CO}_{3}, mathrm{NH}_{4} mathrm{Cl} ) | 10 |
| 104 | The given figure shows the plant for the formation of an important compound ( mathbf{X} ) Identify ( X ) A. Washing soda B. Common salt c. Baking powder D. Bleaching powder | 10 |
| 105 | A salt associated with water of crystallization is known as a: A . acid B. buffer c. hydrate D. anion | 10 |
| 106 | Which of the following is blue in colour? A . Aqueous ( C u S O_{4} ) в. ( F e S O_{4} ) ( c cdot Z n S O_{4} ) D. ( A l_{2}left(S O_{4}right) ) | 10 |
| 107 | Which of the following is not a base? A. ( N a O H ) в. КОН c. ( N H_{4} O H ) D. ( C_{2} H_{5} O H ) | 10 |
| 108 | Identify the conjugate acids and bases in the following equation: ( N H_{3}+H_{2} O rightleftharpoons N H_{4}^{+}+O H^{-} ) A ( cdotleft(H_{2} O, O H^{-}right) ) and ( left(N H_{2}^{+}, N H_{3}right) ) B . ( left(H_{2} O, O H^{-}right) ) and ( left(N H_{4}^{+}, N H_{2}^{2-}right) ) c. ( left(H_{2} O, O Hright) ) and ( left(N H_{3}, N H_{4}right) ) D. ( left(H_{2} O, O H^{-}right) ) and ( left(N H_{4}^{+}, N H_{3}right) ) | 7 |
| 109 | The indicator used in iodometric titrations is A. Phenolphthalein B. Litmus c. Potassium iodide D. starch | 7 |
| 110 | An acid with molecular formula ( C_{7} H_{6} O_{3} ) forms three types sodium salts, i.e., ( C_{7} H_{5} O_{3} N a, C_{7} H_{4} O_{3} N a_{2} ) and ( C_{7} H_{3} O_{3} N a_{3} . ) The basicity of the acid is: A. one B. Two c. Three D. Four | 10 |
| 111 | Which of the following cannot act as an acid as well as a base according to the protonic concept? A. ( H S O_{4} ) в. ( H_{2} O ) c. ( H S^{-} ) D. ( C l O_{4}^{-} ) | 7 |
| 112 | 14. When clectrons are added the resulting ion is called (a) basic radical (b) acidic radicals (c) Deutral radical d) None of these | 10 |
| 113 | Which of the following is used as preservative and flavoring agent? A. Phophoric acid B. Sulphuric acid c. citric acid D. Tartaric acid | 7 |
| 114 | Phenolpthalein is type of indicator. A. Natural indicator B. Universal indicator c. synthetic indicator D. None of the above | 10 |
| 115 | Which of the following negative radical is present in bleaching powder? A. Hypochlorite B. Chlorate c. Chloride D. Both ( (A) ) and ( (C) ) | 10 |
| 116 | The reaction of the acid and the produces carbon dioxide, which causes dough and batters to rise. A. baking soda B. washing soda c. sodium hydroxide D. ammonium hydroxide | 7 |
| 117 | Which of the following salts does not contain water of crystallisation? A . Blue vitriol B. Baking soda c. washing soda D. Gypsum | 10 |
| 118 | Which of the following is a true statement for the acids of phosphorus: ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{3} ) and ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ? ) A. The order of their acidic strength is ( H_{3} P O_{4}> ) ( H_{3} P O_{3}>H_{3} P O_{2} ) B. All of them are reducing in nature. c. All of them are tribasic acids D. The geometry of phosphorus is tetrahedral in all the three | 10 |
| 119 | Give one word or phrase for the following statement. The property by which certain hydrated salts, when left exposed to atmosphere, lose their water of crystallization and crumble into powder. | 10 |
| 120 | In bases, methyl orange turns: A . red B. green c. yellow D. blue | 10 |
| 121 | What volume of ( 0.18 N-K M n O_{4} ) solution would be needed for complete reaction with ( 25 mathrm{ml} ) of ( 0.21 N-K N O_{2} ) in acidic medium ? A ( .57 .29 mathrm{ml} ) в. ( 11.67 m l ) c. ( 29.17 m ) D. ( 22.92 m l ) | 7 |
| 122 | Phenolphthalein gives a pink colour in alkalinate medium due to the fact that: A. It is coloured compound B. It ionises to give coloured ions c. It is decomposed by alkali D. It forms a complex compound with alkal | 7 |
| 123 | Using toothpaste in daily life is the example of A. acidic reaction B. basic reaction c. neutralization reaction D. none of these | 7 |
| 124 | Universal indicator shows yellow colour when added to a solution at ( 25^{0} C . ) If its concentration is changed such that the same indicator shows red colour, then identify the correct statement. A. The solution is diluted to 100 times B. The solution is concentrated by 100 times c. The solution is concentrated 10,000 times D. The solution is concentrated 1,00,000 times | 10 |
| 125 | When honeybee bites, which chemical enters in to our body? A. Calcium formate B. Melittin c. Formic acid D. Magnesium hydroxide | 7 |
| 126 | The electric current is carried through the solution by: A . acids B. bases ( c . ) ions D. alkalis | 7 |
| 127 | The crystalline salt, ( N a_{2} S O_{4} x H_{2} O ) on heating losses ( 55.9 % ) of its weight. The formula of the crystalline salt is : A. ( N a_{2} S O_{4} .5 H_{2} O ) B. ( N a_{2} S O_{4} .7 H_{2} O ) c. ( N a_{2} S O_{4} cdot 10 H_{2} O ) D. ( N a_{2} S O_{4} .2 H_{2} O ) | 10 |
| 128 | Curd taste sour because this is a/an: A. base B. salt c. acid D. liquid | 7 |
| 129 | Methyl orange is used as an indicator. It shows colour changes in acid, base and neutral substance. Tabulate your results as follows: Inference interence ( begin{array}{ll}text { Indicator } & text { Colour Change } \ & text { No change } \ text { Methyl Orange } & cdots \ & text { Yellow }end{array} ) Acid | 10 |
| 130 | Match the second column with the first column: | 10 |
| 131 | What type of oxides are formed when non-metals combine with oxygen? | 10 |
| 132 | Compounds such as alcohols and glucose contain hydrogen but are not categorized as acids. Why? | 7 |
| 133 | since there are 10 water molecules in washing soda, hence it is known as: A. sodium bicarbonate decahydrate B. sodium carbonate decahydrate c. sodium bicarbonate nanohydrate D. sodium decahydrate | 10 |
| 134 | X reacts with calcium carbonate giving ( C O_{2} ) and ( H_{2} O ) and turns methyl orange to: A . yellow B. red c. no color change D. pink | 10 |
| 135 | Two acids ( H_{2} S O_{4} ) and ( H_{3} P O_{4} ) are neutralized separately by the same amount of an alkali when sulphate and dihydrogen phosphates are formed respectively.Find the ratio of the masses of ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) and ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ) | 7 |
| 136 | Basic soil can be corrected by adding: A. urea B. nitric acid c. organic manure D. formic acid | 7 |
| 137 | Indigestion is painful so to relieve indigestion, we take an antacid such as milk of magnesia, which contains: A. magnesium hydroxide B. hydrochloric acid c. tartaric acid D. calcium hydroxide | 7 |
| 138 | ( left[_{boldsymbol{A} mathbf{1}} boldsymbol{C u}left(boldsymbol{H}_{2} boldsymbol{O}right)_{3}(boldsymbol{O} boldsymbol{H})right]^{+}+ ) ( left[boldsymbol{A l}left(boldsymbol{H}_{2} boldsymbol{O}right)_{5}(boldsymbol{O} boldsymbol{H})right]^{2+} ) Choose the correct statement: A ( . A_{1} ) is a base and ( A_{3} ) is an acid B. ( A_{3} ) is conjugate acid of ( A_{1} ) and ( A_{4} ) is conjugate base of ( A_{2} ) C. ( A_{3} ) is conjugate base of ( A_{1} ) and ( A_{4} ) is conjugate acid of ( A_{2} ) D. Noneofthese | 7 |
| 139 | When treated with conc.( H C l, M n O_{2} ) yields a gas ( (X) ) which further reacts with ( C a(O H)_{2} ) to generate a white solid ( (Y) . ) The solid ( Y ) reacts with dil.HCl to produce the same gas ( X ) The solid ( Y ) is : A. ( C a O ) в. ( C a C l_{2} ) c. ( C a(O C l) C l ) ( mathrm{D} cdot mathrm{CaCO}_{3} ) | 10 |
| 140 | Gastric juice contains 0.03 moles ( H C l ) of per liter. If a person produces ( 2.5 mathrm{L} ) of gastric juice per day. How many antacid tablets each containing ( 400 mathrm{mg} ) of ( A l(O H)_{3} ) are needed to neutralize all the ( H C l ) produced in one day? | 7 |
| 141 | What term is used in reference to an aqueous solution’s osmotic pressure? A. Chemical pH indicator B. Acid/base buffer c. Anhydrous solution D. Hypotonic solution E. Supersaturated solution | 10 |
| 142 | ( A 26 mathrm{ml} ) of ( N-N a_{2} C O_{3} ) solution is neutralized by the solutions of acids ( A ) and ( mathrm{B} ) in different experiments. The volumes of the acids ( A ) and ( B ) required were ( 10 m l ) and ( 40 m l ), respectively. How many volumes of ( A ) and ( B ) are to be mixed in order to prepare 1 litre of normal acid solution? A ( .179 .4,820.6 ) B. 820.6,179.4 c. 500,500 D. 474.3,525.7 | 7 |
| 143 | Statement I : An indicator will allow to determine whether a solution is acidic or basic. Statement II : Indicator will change colors in solutions with different pH. A. Statement I is True, Statement II is True and statement I is correct explanation of statements B. Statement lis True, Statement II is True and statement II is NOT correct explanation of statements c. Statement lis True, Statement II is False D. Statement I is False, Statement II is True E. Statement lis False, Statement II is False | 10 |
| 144 | Acids are those substances which (a) Furnish H,O+ in aqueous solution (b) Lowers the pH of solution (c) Furnish OH in aqueous solution (d) Increase the pH of solution | 10 |
| 145 | Which one of the following processes does not occur during formation of ( boldsymbol{C H} boldsymbol{C l}_{3} ) from ( boldsymbol{C}_{2} boldsymbol{H}_{5} boldsymbol{O H} ) and bleaching powder? A. Hydrolysis B. Oxidation c. Reduction D. Chlorination | 10 |
| 146 | The definite number of water molecules which enters into a chemical combination with the substance when the substance is crystallized from its hot saturated solution is called A. crystallization B. water of crystallization c. formation of water molecule D. none of the above | 10 |
| 147 | Soaps are and salts of certain acids. A. potassium and calcium B. sodium and calcium c. sodium and potassium D. calcium and magnesium | 7 |
| 148 | Soaps are and ( _{-1}- ) salts of certain acids. A. potassium and calcium B. sodium and calcium c. sodium and potassium D. calcium and magnesium | 7 |
| 149 | Which of the following soil horizon contain humus? A. A- horizon B. B- horizon c. c – horizon D. D – horizon | 7 |
| 150 | Which of the following substance enters our body when a red ant bites us? A. Melittin B. Calcium Formate c. Formic acid D. Magnesium hydroxide | 7 |
| 151 | An acid having basicity of one and having only one replaceable hydrogen ion per molecule of the acid is : This question has multiple correct options A. carbonous acid B. nitric acid c. sulphuric acid D. hydrochloric acid | 10 |
| 152 | Which acid is used in dentistry and orthodontics as an etching solution? A. Tartaric acid B. Phosphoric acid c. carbonic acid D. Acetic acid | 7 |
| 153 | Ashish took 4 test tubes ( P, Q, R ) and ( S ) each containing ( 10 mathrm{ml} ) of different solutions as shown in the figure. Few drops of methyl orange are added to each tube. The solution in which tube will turn methyl orange to red? ‘his question has multiple correct options A . ( P ) в. ( Q ) ( c . R ) D. ( S ) | 10 |
| 154 | Ant bite is treated by application of A. washing soda B. baking soda c. neutral solution D. acidic solution | 7 |
| 155 | Name the organic acid present in tomato is : A. Tartaric acid B. Malic acid c. Lactic acid D. Oxalic acid | 7 |
| 156 | Give suitable chemical terms for the following: A definite number of water molecules bound to some salts. | 10 |
| 157 | The given figure shows the colour changes in test tubes I, II and III, when China rose indicator is added to them. The respective solutions in test tubes I, II and III are A. Sugar solution, Lime water, Baking powder B. Sugar solution, Lemonjuice, Vinegar C. lime water, Sugar solution, Lemon juice D. Lemon juice, Sugar solution, lime water | 10 |
| 158 | Which compound is produced by the action of chlorine on dry slaked lime? | 10 |
| 159 | Which of the following base is used in the manufacturing of bleaching powder? A. Sodium hydroxide B. Calcium hydroxide c. Magnesium oxide D. Ammonium hydroxide | 7 |
| 160 | Which of the solution will remain colourless with phenolphthalein indicator? A. Soap solution в. ( C a(O H)_{2} ) solution c. vinegar solution D. Baking soda solution | 7 |
| 161 | Bleaching powder is soluble in cold water giving a milky solution due to: A . available chlorine B. lime present in it c. calcium carbonate formation D. the absorption of carbon dioxide from atmospher | 10 |
| 162 | Dry hydrogen chloride gas does not turn blue litmus to red whereas hydrochloric acid does. Why? | 7 |
| 163 | The soil profile is an arrangement in a soil of its: A. horizontal layout B. vertical layout c. diagonal layout D. the depth of soil | 7 |
| 164 | Bleaching powder slowly decomposes to form: A ( cdot C a C l_{2}+C aleft(C l O_{3}right)_{2} ) в. ( C a O+C l_{2} ) c. ( C a C l_{2}+C a(O C l)_{2} ) D. ( C a C O_{3}+C l_{2} ) | 10 |
| 165 | Soda water contains: A. carbonic acid B. sulphuric acid C. carboxylic acid D. nitrous acid | 7 |
| 166 | Observe the given flowchart carefully and mark the appropriate option correctly representing I, II and III. bite ( begin{array}{lll}text { A. Sweet } & text { Calamine } & text { Formic acid }end{array} ) B. Bitter Formic acid Baking soda C. Bitter Baking soda Calamine D. Sweet Formic acid Baking soda | 7 |
| 167 | An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ( ? ) A. Base – Weak, Acid – Strong, End point- Yellow to pinkish red B. Base – Strong, Acid – Strong, End point – Pink to colourless c. Base – weak, Acid – Strong, End point- – Colourless to pink D. Base – strong, Acid- Strong, End point – Pinkish red to yellow | 7 |
| 168 | One drop of methyl orange solution when added to the solution obtained after electrolysis of a concentrated solution of NaCl with Pt electrodes, the colour of the solution will turn: A . orange B. pink c. yellow D. colourless | 10 |
| 169 | 37. pH scale ranges from (1) 0-7 (2) 8-14 (3) 0-14 (4) None | 10 |
| 170 | Starch can be used as an indicator for the detection of traces of? A. Glucose in aqueous solution B. Protein in blood c. lodine in aqueous solution D. Urea in blood | 7 |
| 171 | Sameer took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it. What will be the action of gas evolved on dry litmus paper? | 7 |
| 172 | The indicator used in the titration of a strong acid and a strong base is/are : This question has multiple correct options A. phenolphthalein B. methyl orange c. alizarin yellow D. red litmus | 10 |
| 173 | The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be: A. 7 B. less than 7 ( c cdot 0 ) D. more than 7 | 7 |
| 174 | Which of the following is a Lewis acid? A. ( Bleft(C H_{3}right)_{3} ) в. Nah c. ( N F_{3} ) D. ( P H_{3} ) | 7 |
| 175 | Formula of calcium hypochlorite is: A ( cdot C O C l_{2} ) в. ( C a(C l O)_{2} ) c. ( c aleft(C l O_{3}right)_{2} ) D ( cdot operatorname{ca}left(C l O_{4}right)_{2} ) | 10 |
| 176 | When a drop of an unknown solution is placed on a strip of ( p H ) paper, a deep red colour is produced. This sample should be which one of the following? A. ( N a O H ) в. НС l ( mathrm{c} cdot mathrm{H}_{2} mathrm{O} ) D. ( C H_{3} ) СООН | 7 |
| 177 | Name the source from which litmus solution is obtained. What is the use of this solution? | 10 |
| 178 | Aluminum hydroxide is used for: A. fire extinguishers B. antacid C . water purification D. all of the above | 7 |
| 179 | ( 0.1 N ) solution of sodium carbonate is titrated with ( 0.1 N ) solution of sulphuric acid. The best indicator to be used for this titration is: A. phenolphthalein B. methyl orange c. litmus D. starch solution | 7 |
| 180 | State differences between acids and bases. | 7 |
| 181 | Milk of magnesia is an: This question has multiple correct options A . acid B. antacid c. alkali D. rock salt | 7 |
| 182 | What do all acids and bases have in common? | 7 |
| 183 | Acids are A. sour B. bitter c. spicy D. sweet | 7 |
| 184 | In the titration of ferrous ammonium sulphate and potassium dichromate, the external indicator used is: A. ( K C N S ) в. ( N H_{4} C N S ) c. ( K_{3}left[F e(C N)_{6}right] ) D. ( K_{4}left[F e(C N)_{6}right] ) | 10 |
| 185 | A substance that changes color in response to a chemical change is called as indicator.and Name of the indicator used when sodium hydroxide is titrated against sulphuric acid is phenolpthalein. For true add 0 and for false add 1 | 10 |
| 186 | Behaviour of hydrogen gas towards litmus paper is : A. neutral behaviour B. turns red litmus to blue c. turns blue litmus to red D. litmus paper starts burning | 10 |
| 187 | Which one of the following is the correct statement? ( mathbf{A} cdot H C O_{3}^{-} ) is the conjugate base of ( C O_{3}^{2-} ) B. ( N H_{2}^{-} ) is the conjugate acid of ( N H_{3} ) ( mathrm{C} cdot mathrm{H}_{2} mathrm{SO}_{4} ) is the conjugate acid of ( mathrm{HSO}_{4}^{-} ) D. ( N H_{3} ) is the conjugate base of ( N H_{2}^{-} ) ( mathrm{E} cdot mathrm{H}_{2} mathrm{CO}_{3} ) is the conjugate base of ( mathrm{HCO}_{3}^{-} ) | 7 |
| 188 | When phenolphthalein is added to NaOH, the colour of the solution will become A. colourless B. red c. pink D. yellow | 7 |
| 189 | Which base is employed as the electrolyte in alkaline batteries? ( mathbf{A} cdot C a(O H)_{2} ) в. ( A l(O H)_{3} ) c. ( F e O H ) D. KOH | 7 |
| 190 | An alkali used for removing grease stains is: A. ( H C l ) в. ( A l(O H)_{3} ) c. ( N H_{4} O H ) D. ( N a_{2} S O_{4} ) | 7 |
| 191 | Phenolphthalein indicator is colourless in an acid and turns pink in an alkaline solution. When an aqueous solution of potassium iodide is electrolysed with phenolphthale in indicator, what colours appear at the electrodes? Cathode: ( 2 H_{2} O_{(l)}+2 e^{-} rightarrow H_{(g)}+ ) ( 2 O H^{-}(a q) ) Anode: ( 2 I_{(a q)}^{-} rightarrow I_{2(s)}+2 e^{-} ) A. Brown at the cathode and pink at the anode B. Red at the cathode and pink at the anode c. Brown at the anode and colourless at the cathode D. Pink at the cathode and brown at the anode | 10 |
| 192 | ( boldsymbol{X}+boldsymbol{H}_{2} boldsymbol{O} rightarrow boldsymbol{Y} ) ( Y ) is used to remove grease stains from woollen clothes. Identify ( boldsymbol{X} ) and ( boldsymbol{Y} ) А. ( X=H C l, Y=N a O H ) B. ( X=N H_{4} O H, Y=N H_{3} ) c. ( X=N H_{3}, Y=N H_{4} O H ) D. None of these | 7 |
| 193 | State the difference between: acid radical and basic radical | 7 |
| 194 | An amphoteric substance is: A. a substance that can act as both acids and base by being both proton acceptor and proton donor B. a substance that acts as an acid by being both a proton acceptor and a proton donor C. a substance that acts as a base by being both a proton acceptor and a proton donor D. when a hydronium ion from a base reacts with a hydroxide ion from an acid to make water and a salt E. a base that forms when an acid loses a proton | 7 |
| 195 | Sodium hydroxide turns blue litmus red. A . True B. False | 10 |
| 196 | An example of a solution which is not in equilibrium is : A. chemical pH indicator B. acid/base buffer c. anhydrous solution D. hypotonic solution E. supersaturated solution | 10 |
| 197 | Bleaching powder contains: A. ( C a O ) and ( C l_{2} ) are molecules B. ( C a^{2+} ) and 2 OCl ( ^{-text {ions }} ) c. ( C a^{2+}, C l^{-} ) and ( O C l^{-} ) ions D. ( C a^{2+}, O^{2-} ) ions and ( C l_{2} ) molecule | 10 |
| 198 | Which structure represents a compound that dissolves in water to form an acidic solution? ( A ) B. ( H-C-C=C ) ( _{H} ) ( c ) ( D ) | 7 |
| 199 | In which of the following acetic acid is used? A. Antibiotics B. To remove nail polish c. Antiseptic D. White lead | 7 |
| 200 | What is tooth enamel chemically? Show the condition when its start corroding. what happens when food particles left in the mouth after eating degrade. | 7 |
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