Chemical Reactions And Equations Questions

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Chemical Reactions And Equations Questions

List of chemical reactions and equations Questions

Question No Questions Class
1 4.
Give one example, with equation, of displacement of
hydrogen by a metal from acid.
2 Which of the following is a property of
lactic acid?
lactic acid
A. It decolourises aqueous bromine rapidly
B. It is insoluble in water.
c. It reduces Fehling’s reagent.
D. Two molecules react with each other in the presence of a strong acid
3 7.
In the respiration
(a) the food that we eat is oxidised
(b) the food that we eat is reduced
(c) energy is released
(d) energy is absorbed
4 The reaction
NaOH+HCI – NaCl +H2O
is an example of
(a) Displacement reaction
(b) Double decomposition reaction
(c) Neutralization reaction
(d) Isomerisation reaction
5 12.
In the reaction :
(a) PbO is oxidised
(c) Cis reductant
Pb+ CO
(b) PbO is oxidant
(d) Both (b) and (c)
6 When lead nitrate is heated, it breaks
down into lead monoxide, nitrogen dioxide and oxygen.
( 2 P bleft(N O_{3}right)_{2} rightarrow 2 P b O+4 N O_{2}+O_{2} )
The reaction is an example of:
A. combination reaction
B. decomposition reaction
c. double decomposition reaction
D. displacement reaction
7 Q. 36 What do you understand by exothermic reaction and endothermic
reaction? Give one example of each type.
8 ( Z n+H_{2} S O_{4}(d i l) rightarrow Z n S O_{4}+H_{2} uparrow )
Above reaction is:
A. decomposition reaction
B. displacement reaction
c. combination reaction
D. synthesis reaction
9 роль по ППС Bus tо поло
ch of the following involves combination of two
(a) CaO+CO, > CaCO,
(b) 4Na+02 – 2NaO
(C) 2502 +02 – 2003
(d) NH2 + HCI —NHACI
10 Find out the major product in given reaction.
( boldsymbol{H}_{5} boldsymbol{C}_{6} boldsymbol{C H O}+ )
( boldsymbol{H}_{3} boldsymbol{C C H}_{2} boldsymbol{C H O} stackrel{text {dil.NaOH}}{longrightarrow} ? )
11 9.
A balanced chemical equation should represent
(a) Temperature of reaction
(b) Catalyst involved
(c) Atomicity of each element
(d) Physical states of reactant and products
12 1.
Observe the following figure, complete the reaction(s) and
tell in which beaker/beakers displacement reactions take place
Beaker A: Copper Sulphate (CuSO2) + Zinc granule (Zn).
Beaker B: Copper Sulphate (CuSO2) +Iron nail (Fe)
Beaker C: Zinc Sulphate (ZnSO2) + Copper turnings (Cu),
Beaker D: Ferrous sulphate (FeSO2) + Copper turnings (Cu).
Beaker E: Zinc Sulphate (ZnSO2) + Iron nail (Fe),
13 The formation of a chemical compound is accompanied with.
(a) Evolution of energy
(b) Absorption of energy
(c) Either absorption or evolution of energy
(d) None of these
14 Magnesium ribbon is burnt in an
atmosphere of nitrogen gas to form solid magnesium nitride. This is a :
A. synthesis reaction
B. combination reaction
c. displacement reaction
D. none of the above
15 o
The reaction;
2Mg(s) +0, (g) → → 2 Mgo (s) is
(a) a combination reaction
(b) a synthesis reaction
(©) a reaction in which an element and a compound react
to produce a compound
(d) a reaction in which two elements react to produce a
16 Assertion
Concentrated ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) reacts with ( boldsymbol{K} boldsymbol{C l} )
to give ( C l_{2} ) gas.
( H C l ) cannot be oxidised by
concentrated ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} )
A. Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion,
B. Both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion
c. Assertion is CORRECT, but reason is INCORRECT
D. Assertion is INCORRECT, but reason is CORRECT
17 Remedy for a bee sting is baking soda whereas wasp sting is cured with vinegar.Why?
A. Vinegar is better than baking soda
B. Baking soda has side effects
c. Bee sting is acidic while wasp sting is slightly basic
D. Vinegar has more remedial properties
18 5.
The reaction :
N2 (g) + O2(g) + heat –
(a) a homogeneous reaction
(b) a heterogeneous reaction
(c) a combination reaction
(d) an endothermic reaction
19 10. CuO+H2 – Cu +H2O
Above reaction is an example of
(a) redox reaction
(b) synthesis reaction
(c) neutralisation reaction
(d) decomposition reaction
20 33. A white solid ‘A’ on heating gives
off a gas which turns lime water
milky. The residue is yellow when
hot but turns white on cooling.
The solid A is
(1) Zinc carbonate
(2) Lead sulphate
(3) Lead carbonate
(4) Zinc sulphate
21 Tidur
13. Which of the fi
Which of the following is an isomerization reaction ?
(a) 2Na+ 2H20 – 2NaOH+H,
(b) 2KBr + Cl2 → 2KCI+Brą
(c) ZnCoz heat → ZnO + CO2
22 Which of the following is a displacement reaction?
( A cdot operatorname{cacos} rightarrow c a 0+c O )
B . Ca0+2HCI ( rightarrow ) CaCl ( _{2}+H_{2} ) O
( mathrm{c} cdot mathrm{Fe}+mathrm{CuSO}_{4} rightarrow mathrm{FeSO}_{4}+mathrm{Cu} )
D. NaOH+HCI ( rightarrow ) Nacl ( +H_{2} ) 0
23 Which of the following is not a decomposition reaction?
( A cdot operatorname{cac} 0_{3} rightarrow operatorname{cad}+cos )
В. ( 2 mathrm{KClO}_{3} rightarrow 2 mathrm{KCl}+3 mathrm{O}_{2} )
c. Digestion of food in the body
D. NaOH+HCI ( rightarrow ) Nacl + Hz
24 In which of the following, displacement reaction is possible?
A. Solution of ( A g N O_{3}+ ) coin of copper
B. Solution of ( M g C l_{2}+ ) Coin of Aluminium
c. Solution of ( F e S O_{4}+ ) coin of Silver
D. Solution of ( N a C l+ ) Coin of Copper
25 Which is the strongest base?
A. Pyrole
B. Aniline
c. Pyridine
26 Reactions which can be called as double
displacement reactions is/are:
A. precipitation reactions
B. neutralization reactions
c. both A and B
D. none of the above
27 What is the effect of HCL on following?
(a) Mg ribbon
(b) ( mathrm{NaOH} )
(c) crushed eggshell
28 Write a chemical equation for photodecomposition reaction. 10
29 What is the minimum mass of
( C a C O_{3}(s), ) below which it decomposes completely, required to established equilibrium in a 6.50 litre container for
the reaction:
( boldsymbol{C a C O}_{3}(s) rightleftharpoons boldsymbol{C a O}(boldsymbol{s})+ )
( boldsymbol{C O}_{2}(boldsymbol{g}) ; boldsymbol{K}_{c}=mathbf{0 . 0 0 5} ) mole / litre
A. ( 3.25 g )
в. ( 24.6 g )
c. ( 40.9 g )
D. ( 8.0 g )
30 Which of the following is an acid-base
neutralization reaction?
( mathbf{A} cdot A g^{+}(a q)+C l^{-} rightarrow A g C l(a q) )
B ( cdot C_{5} H_{12}(s)+8 O_{2}(g) rightarrow 5 C O_{2}(g)+6 H_{2} O(l) )
( mathbf{C} cdot N H_{3}(s)+H_{2} O(s) leftrightharpoons N H_{4}^{+}(s)+O H^{-}(s) )
D. ( H C_{2} H_{3} O_{2}(l)+O H^{-}(a q) rightarrow H_{2} O(O)+C_{2} H_{3} O_{2}^{-}(a q) )
E ( cdot C a C O_{3}(s) rightarrow C a O(s)+C O_{2}(g) )
31 Select the ame that resents a displacement reaction
(a) NaCI – AgNO – Cl + NO3
(b) Zn + CuSO4 — ZSDA+Cu
(c +CI+ NaOH – NaCl +HO
(a) C+0 – 00,
32 Rusting of iron is a chemical reaction.
The reaction can be termed as:
A. combination reaction
B. addition reaction
c. both (A) and (B)
D. decomposition
33 ( N_{2} O_{5} ) decomposes to ( N_{2} O_{4} ) and ( O_{2} ) as :
( N_{2} O_{5} rightarrow N_{2} O_{4}+frac{1}{2} O_{2} )
The pressure ( P_{1} ) at any stage is related
to ( p_{0} ) and ( x, ) the fraction of dissociation,
( mathbf{A} cdot p_{0} )
B. ( left(1+frac{1}{2} xright) p_{0} )
c. ( _{1-frac{3}{2} p_{0}} )
D. ( frac{3}{2} x p_{0} )
34 4.
The reaction :
C(s) + O2(g) — CO2 (g) + heat is
(a) a homogeneous reaction
(b) a heterogeneous reaction
(c) an exothermic reaction
(d) an endothermic reaction
35 Identify the product(s) which will be formed by using the information provided about the reactants:
( M g(s)+2 H C l rightarrow )
A ( . M g C l_{2}+F e )
B. ( M g F e+C l_{2} )
c. ( M g C l_{3}+F e )
D. ( M g C l_{2}+H_{2} )
E ( . M g+F e+C l_{2} )
36 Question 33. Balance the following equation : 10
37 The substances you start with is called and after the chemical change, what is formed is called the
A . reactants, products
B. reactants, gases
c. element, products
D. element, compounds
38 Formation of nitric oxide from nitrogen and oxygen is a reaction.
A. combination
B. combustion
c. calcination
D. roasting
39 When lead ( (P b) ) is reacted with the
hydrochloric acid a gas is evolved.
Name the gas.
A. Hydrogen gas
B. Chlorine gas
c. Both hydrogen gas and chlorine gas
D. None of them
40 ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7}+boldsymbol{H} boldsymbol{C l} rightarrow boldsymbol{C r} boldsymbol{C l}_{3}+boldsymbol{H}_{2} boldsymbol{O}+ )
( boldsymbol{C l}_{2}+boldsymbol{K} boldsymbol{C l} )
Balance in basic medium by ionelectron identity spectator ion.
41 Ferrous sulphate decomposes with the
evolution of a gas having a characteristic odour of burning sulphur Identify the type of reaction.
A. Redox reaction
B. Precipitation reaction
c. Double displacement reaction
D. Thermal decomposition reaction
42 Calcium carbonate decomposes into calcium oxide and carbon
dioxide. The reactant is:
A. Carbon dioxide
B. Calcium oxide
c. calcium carbonate
D. None of the these
43 Complete the missing components/variables given as ( x ) and ( y ) in the following reactions.
( P bleft(N O_{3}right)_{2}(a q)+2 K I(a q) rightarrow )
( boldsymbol{P b I}_{2}(boldsymbol{x})+boldsymbol{2} boldsymbol{K} boldsymbol{O}_{3}(boldsymbol{y}) )
A ( . x rightarrow s ; y rightarrow g )
в. ( x rightarrow s ; y rightarrow a q )
c. ( x rightarrow a q ; y rightarrow g )
D. None of these
44 9.
What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.
45 Correct balanced equation from the following reactions is:
A. ( N a H C O_{3} rightarrow N a_{2} C O_{3}+H_{2} O+C O_{2} )
в. 2 NaHCO ( _{3} rightarrow 2 ) Na( _{2} ) CO ( _{3}+H_{2} ) O +3 C ( O_{2} ),
( mathrm{c} cdot 2 mathrm{NaH} mathrm{CO}_{3} rightarrow mathrm{Na}_{2} mathrm{CO}_{3}+mathrm{H}_{2} mathrm{O}+mathrm{CO}_{2} )
D. ( _{N a H C O_{3} rightarrow N a_{2} C O_{3}+frac{1}{2} H_{2} O+C O_{2}} )
46 When hydrogen is passed over a black solid compound ( A, ) the products are ‘a colourless liquid’ and ‘a reddish brown
metal B’.

Substance B is divided into two parts,
each placed in separate test tubes. Dilute HCl is added to one part of
substance B and dilute ( H N O_{3} ) to the
other. What happens to substance ( A ) when it reacts with hydrogen ? Give
reasons for your answer

47 All reactions involving chemical decomposition:
A. are reversible
B. are reversible and endothermic
c. are exothermic
D. may be reversible or irreversible and endothermic or exothermic.
48 glull.
Which type of reaction is responsible for this change?
a) Displacement (b) Combination
) Decomposition . (d) Double decomposition
49 Assertion
The laws of chemical combination
ultimately led to the idea of ‘atoms’ being the “smallest unit of” matter

The laws of chemical combination
played a significant role in the
development of Dalton’s atomic theory
of matter
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

50 What type of chemical reaction takes place when i) limestone is heated?
ii) a magnesium ribbon is burnt in air?
51 A magnesium ribbon is burnt in oxygen
to give a white compound ( boldsymbol{X} ) accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to
burn and forms a compound ( Y . ) Write
the chemical formula of ( X ) and ( Y: )
A. ( x rightarrow M g O ; y rightarrow M g N )
В. ( x rightarrow 2 M g O ; y rightarrow M g_{2} N_{3} )
C ( . x rightarrow M g O ; y rightarrow M g_{3} N_{2} )
D. None of these
52 Using the given materials design the experiment to illustrate the change in speed of chemical reaction with temperature. Materials: Sodium thiosulphate, water,
dilute ( H C l ) boiling tubes, beaker, spirit
( operatorname{lamp} )
53 Study the given figure carefully.
Which of the following reactions explains the above change most appropriately?
A. ( Z n S O_{4}+C u rightarrow C u S O_{4}+Z n )
в. ( C u S O_{4}+F e rightarrow F e S O_{4}+C u )
c. FeSO( _{4}+C u rightarrow ) CuSO( _{4}+ ) Fe
D. ( C u S O_{4}+Z n rightarrow Z n S O_{4}+C u )
54 When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution.
The reaction is an example of a:
A. Combination reaction
B. Displacement reaction
c. Decomposition reaction
D. Double displacement reaction
55 Q Type your question
and ( (D) ) are respectively:
( B )
( c )
( D )
56 7.
Which one is a decomposition reaction ?
(a) 2Hgo-heat → 2Hg +02
(b) Caco, heat CaO + CO2
(c) 2H,0
21, +02
(d) All the above reactions are decomposition reactions
omnounds exchange
57 composition
Correct chemical equation for process.
(a) 2Fe + CuSO4- Fe2SO4 +Cu
(6) Fe+CuSO4 FeSO4 +Cu
(©) FeSO4 +Cu CuSO4 + Fe
(d) None of the above
58 What happens when a copper vessel is exposed in moist
59 Which of the following substances is
( mathbf{A} cdot H_{3} O^{+} )
в. ( H_{2} S O_{4} )
c. ( H S O_{4}^{-} )
D. ( S O_{4}^{2-} )
60 4.
Write equations for the reaction of
(a) iron with steam
(b) calcium with water
(c) potassium with water

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