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Question

During the change of state which of the following is true for molecules of a substance, if the substance is being heated?

A
Kinetic energy increases
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B
Potential energy increases
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C
Both increase
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D
Both remains constant
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Solution

The correct option is B Potential energy increases
During change of state, if the substance is being heated
Lets discuss about kinetic energy.
In thermodynamics we derived the formula for kinetic energy 32KT
K= Boltzman constant, T = temperature
During change of state, temperature of substance does not change.
So kinetic energy remains same.
Potential energy increases due to change in inter molecular force.
Breaking of inter molecular bonds takes place.


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