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Question

For which of the following processes, total entropy of universe increases.

A
Melting one mole of ice to water at 0C
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B
Freezing one mole of water to ice at 0C
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C
Freezing one mole of water to ice at 10C
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D
Melting one mole of ice at 10C into water
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Solution

The correct options are
C Freezing one mole of water to ice at 10C
D Melting one mole of ice at 10C into water
As we know,
In melting process, solid convert into more free form water so entropy of universe increases in melting one mole of ice at 10C into water.
Also natural water freezes at 0o C so in freezing one mole of water to ice at 10C entropy increases.

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