Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 18

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Weekly Quiz Competition

Question 1
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)

Solution

Combustion of any substance is a chemical change because new substance is formed after combustion.
Question 2
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The following reaction is an example of a

4NH₃(g) + 50₂(g) → 4NO(g) + 6H₂O(g)

(i) displacement reaction

(ii) combination reaction

(iii) redox reaction

(iv) neutralisation reaction

A
(i) and (iv)

B
(ii) and (iii)

C
(i) and (iii)

D
(iii) and (iv)

Solution

In this reaction, oxygen is displacing hydrogen from ammonia; hence it is a displacement reaction. Moreover, nitrogen is getting oxidized and oxygen is getting reduced. Hence, this is redox reaction.
Question 3
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Which of the following statements about the given reaction are correct?

3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)

(i) Iron metal is getting oxidized

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidizing agent

A
(i), (ii) and (iii)

B
(iii) and (iv)

C
(i), (ii) and (iv)

D
(ii) and (iv)

Solution

Oxygen is being added to iron, hence iron is getting oxidized. Oxygen is removed from water; hence water is getting reduced. Water is providing oxygen; hence water is the oxidizing agent.
Question 4
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Which of the following are exothermic processes?

(i) Reaction of water with quick lime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

A
(i) and (ii)

B
(ii) and (iii)

C
(i) and (iv)

D
(iii) and (iv)

Solution

Exothermic process are chemical process which take place with the release of heat. Enormous amount of heat energy is released when dilution of acid takes palce and when water reacts with quick lime.
Question 5
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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 statement(s) is(are)correct?

(i) In beakers A and B, exothermic process has occurred.

(ii) In beakers A and B, endothermic process has occurred.

(iii) In beaker C exothermic process has occurred.

(iv) In beaker C endothermic process has occurred.

A
(i) only

B
(ii) only

C
(i) and (iv)

D
(ii) and (iii)

Solution

Exothermic process will increase the temperature of beaker, while endothermic process will reduce the temperature of beaker.
Question 6
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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.

Solution

Potassium permanganate is a potential oxidizing agent. The purple colour was because of KMnO₄; which disappears once all the permanganate in the solution is utilized. This is an example of titration
Question 7
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Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii) decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

A
(i) only

B
(i) and (iii)

C
(ii) and (iii)

D
(iv) only

Solution

When silver chloride is kept in sunlight: it turns to grey because of formation of silver. This is a decomposition reaction.
Question 8
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Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanies by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction

(ii) It is an exothermic reaction

(iii) The pH of the resulting solution will be more than seven

(iv) The pH of the resulting solution will be less than seven

A
(i) and (ii)

B
(ii) and (iii)

C
(i) and (iv)

D
(iii) and (iv)

Solution

Slaking of lime is an exothermic reaction which is evident from liberation of heat. Oxides and hydroxides of metals are alkaline. Hence, pH of the resulting solution will be more than 7.

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Chemical Reactions and Equations Test - 18

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Chemical Reactions and Equations Test - 18

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Question 1

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefied Petroleum Gas (LPG)

Solution

Question 2

(i) and (iv)

(ii) and (iii)

(i) and (iii)

(iii) and (iv)

Solution

Question 3

(i), (ii) and (iii)

(iii) and (iv)

(i), (ii) and (iv)

(ii) and (iv)

Solution

Question 4

(i) and (ii)

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

Solution

Question 5

(i) only

(ii) only

(i) and (iv)

(ii) and (iii)

Solution

Question 6

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.

Solution

Question 7

(i) only

(i) and (iii)

(ii) and (iii)

(iv) only

Solution

Question 8

(i) and (ii)

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

Solution

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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.