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Question

Under standard conditions of temperature and pressure a piece of ice melts completely on heating it. Obviously the increase in internal energy of the system (ice and water) is

A
equal to the heat given.
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B
more than the heat given.
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C
less than the heat given.
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D
zero.
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Solution

The correct option is B more than the heat given.
we know that When ice melt, volume of water decreases.
so dW=PdV<0
dQ=dU+dW
dU=dQdW>dQ
so Under standard conditions of temperature and pressure a piece of ice melts completely on heating it. Obviously the increase in internal energy of the system (ice and water) is more than the heat given.
Hence option B is correct.

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