A body of Cu at 100∘C is in contact with another body of Cu at 0∘C.There occurs transfer of heat from a hot body to a cold body till both acquires the same temperature. If ΔhS∞ and ΔS∞ are the changes in entropy of hot and cold body, respectively, then

# A body of $\mathrm{Cu}$ at ${100}^{\circ }\mathrm{C}$ is in contact with another body of $\mathrm{Cu}$ at ${0}^{\circ }\mathrm{C}$.There occurs transfer of heat from a hot body to a cold body till both acquires the same temperature. If ${\mathrm{\Delta }}_{h}{S}^{\mathrm{\infty }}$ and $\mathrm{\Delta }{S}^{\mathrm{\infty }}$ are the changes in entropy of hot and cold body, respectively, then

1. A

${\mathrm{\Delta }}_{h}{S}^{\circ }+{\mathrm{\Delta }}_{c}{S}^{\circ }=0$

2. B

${\mathrm{\Delta }}_{h}{S}^{\circ }+{\mathrm{\Delta }}_{c}{S}^{\circ }>0$

3. C

${\mathrm{\Delta }}_{\mathrm{h}}{S}^{\circ }+{\mathrm{\Delta }}_{\mathrm{c}}{S}^{\circ }<0$

4. D

${\mathrm{\Delta }}_{h}{S}^{\circ }={\mathrm{\Delta }}_{c}{S}^{\circ }$

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### Solution:

Process is irreversible, so that,

.

Thus, option B is correct.

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