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Q.

For the process H2O(l)(1 bar, 373K)H2O(g) (1 bar, 373 K), the correct set of thermodynamic parameters is :

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a

ΔG=0,ΔS=ve

b

ΔG=+ ve, ΔS=0

c

ΔG=0,ΔS=+ve

d

ΔG= ve, ΔS=+ ve 

answer is A.

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Detailed Solution

As there is equilibrium between the liquid and gaseous state of water molecule,

At 373 K, ΔG  =0 

When state changes from liquid to gas, then entropy increases, 

Thus,

ΔS = positive

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