In which of the following processes the change in the states of matter involve the absorption of energy? A. Boiling B. Freezing C. Condensation D. Melting
A
A only
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B
A and B only
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C
A, B and C only
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D
A and D only
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Solution
The correct option is D A and D only There will be an absorption of heat energy in the process of melting and boiling. In condensation as well as in freezing, heat energy is released (temperature reduced) and hence the kinetic energy of molecules decreases and gas changes to liquid and solid subsequently.