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Question

The temperature increases is not notices in which of the following processed on providing heat to system?
(I) Fusion at melting point
(II) Phase transition at transition temperature
(III) Boiling at boiling point
(IV) A reaction in chemical equilibrium

A
I, II, III
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B
I, III
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C
III, IV
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D
II, IV
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Solution

The correct option is D I, II, III
At melting point, the heat given is used for increasing intermolecular force of attraction. Hence, temperature doesn't increase.
During phase transition, the composition of phase changes by adding heat in the system.
Boiling at boiling point makes the vapour superheated.
By adding heat in chemical equilibrium, the enthalpy of reaction changes so the temperature of the system varies.
Hence, option A is correct

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