Thermochemistry MCQ question and answer with solution

21

Statement I A thermally insulated vessel contains some water. If the vessel is shaken vigorously, the temperature of the water will rise.
Statement II In this process energy is given to the water.
Which one of the following is correct with reference to the above statements?

A) Both statement I and statement II are true and statement II is the correct explanation of statement I B) Both statement I and statement II are true, but statement II is not the correct explanation of statement I C) Statement I is true, but statement II is false D) Both statement I and statement II are false

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Answer & Solution

Answer: Option A

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22

Consider the following statements regarding a motor car battery.
1. The voltage is usually 12 V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere hour.
Which of the above statement are correct?

A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1 and 4

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Answer & Solution

Answer: Option D

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23

When a lead storage battery is discharged then?

A) SO₂ is evolved B) lead is formed C) lead sulphate is formed D) sulphuric acid is consumed

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Answer & Solution

Answer: Option C

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24

Which one among the following metals is prominently used in mobile phone batteries?

A) Coppe B) Zinc C) Nickel D) Lithium

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Answer & Solution

Answer: Option D

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25

Assertion (A) For a galvanic cell, oxidation takes place at anode and reduction at cathode.
Reason (R) Electrons in the external circuit move from anode to cathode

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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Answer & Solution

Answer: Option B

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26

Match List-I with List-II.

List-I	List-II
a. Endothermic	1. Variation of enthalpy of a reaction with temperature
b. Exothermic	2. A process or reaction which consumes heat
c. Activation energy	3. A process or reaction that releases heat
d. Arrhenius equation	4. The amount of energy which must be invested in a reaction to get it started

Select the correct answer:

A) a-2, b-3, c-4, d-1 B) a-3, b-4, c-1, d-2 C) a-4, b-1, c-2, d-3 D) a-1, b-2, c-3, d-4

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Answer & Solution

Answer: Option A

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27

When items of jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

A) cooling to below 0°C B) heating above 100°C C) passing an electric current D) just keeping it for 10 min

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Answer & Solution

Answer: Option C

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28

Silver ware turns black after a period of time due to the formation of

A) nitrate coating on silver B) sulphide coating on silver C) chloride coating on silver D) oxide coating on silver

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Answer & Solution

Answer: Option B

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29

The advantage of using fuel cell in a motor car could be

A) low initial cost B) emission less operation C) light weight D) freedom from refueling

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Answer & Solution

Answer: Option B

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30

When two plates of different metals are placed in an electrolyte, the developed emf between them depends on

A) the type of electrolyte B) distance between the plates C) position of the two metals in the electrochemical series D) All of the above

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Answer & Solution

Answer: Option B

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Thermochemistry MCQ question and answer with solution | Chemistry Gk MCQs