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Question

At equilibrium state

A
ΔtotalS>0
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B
ΔtotalS<0
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C
ΔtotalS=0
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D
unpredictable
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Solution

The correct option is C ΔtotalS=0
Entropy change in spontaneous process :
ΔSSystem+ΔSsurrounding0
The sign > is for spontaneous process. A state of equilibrium in a close system is attained spontaneously.
As system approaches equilibrium from non - equilibrium state STotal Keeps on increasing at equilibrium
STotal attains its maximum value.
ΔSTotal=0 at equilibrium
at this point STotal= maximum value at equilibrium in a close system.

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