Thermochemistry MCQ question and answer with solution

1

Combustion of a candle is

A) physical change B) reduction reaction C) endothermic reaction D) exothermic reaction

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Answer & Solution

Answer: Option A

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2

Which law of the thermochemistry introduces the concept of entropy?

A) Second Law B) Zeroth Law C) Third Law D) First Law

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Answer & Solution

Answer: Option A

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3

Which of the following is a closed system?

A) Jet engine B) Tea placed in steel kettle C) Pressure cooker D) Rocket engine during propulsion

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Answer & Solution

Answer: Option B

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4

The entropy of perfectly crystalline solid at absolute zero is

A) positive B) negative C) Zero D) not definite

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Answer & Solution

Answer: Option C

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5

In the pressure cooker, cooking is fast because the increase in vapour pressure

A) increases the specific heat B) decreases the specific heat C) decreases the boiling point D) increases the boiling point

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Answer & Solution

Answer: Option D

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6

Food cans are coated with tin but not with zinc because

A) zinc is costlier than tin B) zinc has a higher melting point than tin C) zinc is more reactive than tin D) tin is more reactive than zinc

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Answer & Solution

Answer: Option C

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7

If a reaction is carried out at constant pressure, which of the following statement is correct?

A) The reaction is likely to be endothermic B) The heat change is equal to the enthalpy change C) The reaction is likely to be exothermic D) The heat change is equal to the change in temperature

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Answer & Solution

Answer: Option B

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8

The working of a dry cell is based on

A) decomposition reaction B) spontaneous oxidation reduction reaction C) combination reaction D) electrolysis

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Answer & Solution

Answer: Option D

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9

The electrochemical cell stops working after sometime because

A) electrode potential of both electrodes becomes zero B) one of electrodes completely vanishes C) electrode potential of both electrodes equalizes D) the reaction reverses its direction

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Answer & Solution

Answer: Option C

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10

The life span of a Daniell cell may be increased by

A) larger Zn electrode B) larger Cu electrode C) lowering the temperature D) lowering the concentrations

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Answer & Solution

Answer: Option A

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Thermochemistry MCQ question and answer with solution | Chemistry Gk MCQs