Chemical Reactions and Equations Test

Question 1
1 / -0
Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to
1. the formation of silver by decomposition of silver chloride
2. sublimation of silver chloride
3. decomposition of chlorine gas from silver chloride
4. oxidation of silver chloride
A
(i) only

B
(i) and (iii)

C
(ii) and (iii)

D
(iv) only

Question 2
1 / -0
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO₄ and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statements(s) is (are) correct?
1. In beakers A and B, exothermic process has occurred.
2. In beakers A and B, endothermic process has occurred.
3. In beaker C exothermic process has occurred.
4. In beaker C endothermic process has occurred.
A
(i) only

B
(ii) only

C
(i) and (iv)

D
(ii) a nd (iii)

Question 3
1 / -0

Corrosion of metals can be prevented

A
by coating the metal surface with a paint.

B
by applying film of grease and oil on the surface of the metal.

C
by covering the surface of the metal with another metal which is more electropositive.

D
all of these.

Question 4
1 / -0

Identify the chemical equation which represents a complete balanced equation for the reaction of barium chloride with sodium sulphate to produce barium sulphate and sodium chloride.

A
BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + NaCl(aq)

B
BaCl₂(aq) + Na₂SO₄(aq) → 2BaSO₄(s) + 2NaCl(aq)

C
2BaCl₂(aq) + Na₂SO₄(aq) → 2BaSO₄(s) + NaCl(aq)

D
BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)

Question 5
1 / -0

Which of the following is not a physical change?

A
Boiling of water to give water vapour

B
Melting of ice to give water

C
Dissolution of salt in water

D
Combustion of Liquefied Petroleum Gas (LPG)

Question 6
1 / -0

Which among the following is(are) double displacement reaction(s)?

(i) Pb + CuCl₂ → PbCl₂ +Cu

(ii) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

(iii) C + O₂ → CO₂

(iv) CH₄ + 2O₂ → CO₂ + 2H₂O

A
(i) and (iv)

B
(ii) only

C
(i) and (ii)

D
(iii) and (iv)

Question 7
1 / -0

Which of the following reactions represents a combination reaction?

A
CaO(s) + H₂O(l) → Ca(OH)₂ (aq)

B
CaCO₃(s) → CaO(s) + CO₂(g)

C
Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)

D
2FeSO₄(s) → Fe₂O₃(s) + SO₂(g) + SO₃(g)

Question 8
1 / -0

Which of the following observation help(s) us to determine that a chemical change has taken place?

A
Change in temperature.

B
Change in colour.

C
Evolution of a gas.

D
All of these

Question 9
1 / -0

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

A
KMnO₄ is an oxidising agent, it oxidises FeSO₄

B
FeSO₄ acts as an oxidising agent and oxidises KMnO₄

C
The colour disappears due to dilution; no reaction is involved

D
KMnO₄ is an unstable compound and decomposes in presence of FeSO₄ to a colourless compound.

Question 10
1 / -0
Which of the following is (are) an endothermic processes?
1. Dilution of sulphuric acid.
2. Sublimation of dry ice.
3. Condensation of water vapours.
4. Evaporation of water.
A
(i) and (iii)

B
(ii) only

C
(iii) only

D
(ii) and (iv)

Submit Test

Chemical Reacti...

Question 1

(i) only

(i) and (iii)

(ii) and (iii)

(iv) only

Question 2

(i) only

(ii) only

(i) and (iv)

(ii) a nd (iii)

Question 3

by coating the metal surface with a paint.

by applying film of grease and oil on the surface of the metal.

by covering the surface of the metal with another metal which is more electropositive.

all of these.

Question 4

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + NaCl(aq)

BaCl2(aq) + Na2SO4(aq) → 2BaSO4(s) + 2NaCl(aq)

2BaCl2(aq) + Na2SO4(aq) → 2BaSO4(s) + NaCl(aq)

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)

Question 5

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefied Petroleum Gas (LPG)

Question 6

(i) and (iv)

(ii) only

(i) and (ii)

(iii) and (iv)

Question 7

CaO(s) + H2O(l) → Ca(OH)2 (aq)

CaCO3(s) → CaO(s) + CO2(g)

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)

Question 8

Change in temperature.

Change in colour.

Evolution of a gas.

All of these

Question 9

KMnO4 is an oxidising agent, it oxidises FeSO4

FeSO4 acts as an oxidising agent and oxidises KMnO4

The colour disappears due to dilution; no reaction is involved

KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound.

Question 10

(i) and (iii)

(ii) only

(iii) only

(ii) and (iv)

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Question Analysis

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BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + NaCl(aq)

BaCl₂(aq) + Na₂SO₄(aq) → 2BaSO₄(s) + 2NaCl(aq)

2BaCl₂(aq) + Na₂SO₄(aq) → 2BaSO₄(s) + NaCl(aq)

BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)

CaO(s) + H₂O(l) → Ca(OH)₂ (aq)

CaCO₃(s) → CaO(s) + CO₂(g)

Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)

2FeSO₄(s) → Fe₂O₃(s) + SO₂(g) + SO₃(g)

KMnO₄ is an oxidising agent, it oxidises FeSO₄

FeSO₄ acts as an oxidising agent and oxidises KMnO₄

KMnO₄ is an unstable compound and decomposes in presence of FeSO₄ to a colourless compound.