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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.

Chemistry

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