Thermochemistry MCQ question and answer with solution

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If a refrigerator's door is kept open, then

A) room will be cooled B) room will be heated C) room may get cooled or heated depending upon the weather D) no effect

Discuss

Answer & Solution

Answer: Option B

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A smuggler could not carry gold by depositing iron on the gold surface, because

A) gold has lower standard reduction potential than iron B) gold has higher standard reduction potential than iron C) iron rusts D) gold in denser

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Answer & Solution

Answer: Option B

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What is an endothermic reaction?

A) Reaction in which heat is released B) Reaction in which heat is absorbed C) Reaction in which neither heat is released nor absorbed D) None of the above

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Answer & Solution

Answer: Option B

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Which of the following reaction is an example of exothermic reaction?

A) Burning of natural gas B) Respiration C) The decomposition of vegetable matter into compost D) All options are correct

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Answer & Solution

Answer: Option D

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The depolarisation in a primary cells is used for the purpose of

A) increasing the life of the cell B) increasing the emf of the cell C) removing the hydrogen collected at one of the plates D) removing the dipoles from the electrolytes

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Answer & Solution

Answer: Option B

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When an acid cell is charged, then

A) voltage of cell increases B) resistance of cell increases C) electrolyte of cell dilutes D) None of the above

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Answer & Solution

Answer: Option A

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To protect iron against corrosion, the durable metal plating on it, is

A) tin plating B) copper plating C) zinc plating D) nickel plating

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Answer & Solution

Answer: Option C

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Consider the following statements.
The electrochemical series helps
1. in extraction of metals.
2. in protecting themetal fromcorrosion.
3. in comparing the reactivity of metals.
Which of the above is/are true?

A) Only 1 B) Only 2 C) 2 and 3 D) 1, 2 and 3

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Answer & Solution

Answer: Option D

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Which of the following statements about the commonly used automobile battery are true?
1. It is usually a lead-acid battery.
2. It has six cells with a potential of 2V each.
3. Its cells work as galvanic cells while discharging power.
4. It cells work as electrolytic cells while recharging.
Select the correct answer:

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

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Answer & Solution

Answer: Option A

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In an electrochemical cell that functions as a voltaic cell

A) electrons move from the cathode to the anode B) electrons move through a salt bridge C) electrons can move either from the cathode to the anode or from the anode to the cathode D) reduction occurs at the cathode

Discuss

Answer & Solution

Answer: Option D

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Thermochemistry MCQ question and answer with solution | Chemistry Gk MCQs