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Question

In which of the following processes do the change in the states of matter involve the release of energy?
i. Deposition ii. Fusion iii. Solidification iv. Condensation

A
(i) only
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B
(i), (iii), (iv) only
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C
(iii) and (iv) only
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D
(ii) only
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Solution

The correct option is B (i), (iii), (iv) only
Deposition is the reverse of sublimation, i.e. change in the physical state of a substance from a gaseous state to a solid state. Sublimation occurs when heat is absorbed by the matter and deposition occurs when heat is released by the matter.
Fusion or melting Melting is the transition of a substance from the solid state to a liquid state. Fusion occurs when heat is absorbed by the matter.
Solidification is the reverse of fusion or melting, i.e. change in the physical state of a substance from a liquid state to a solid state. Fusion or melting occurs when heat is absorbed by the matter and solidification occurs when heat is released by the matter.
Condensation is the reverse of vaporization i.e. change in the physical state of a substance from a gaseous state to a liquid. Vaporization occurs when heat is absorbed by the matter and condensation occurs when heat is released by the matter.

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