Q.

Consider the following liquid-vapour equilibrium. 

 Liquid  Vapour 

Which of the following relation is correct? 

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a

dlnPdT2=-ΔHvT2

b

dlnPdT=ΔHvRT2

c

dlnGdT2=ΔHvRT2

d

dlnPdT=-ΔHvRT

answer is B.

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Detailed Solution

This is Clausius - Clapeyron equation. 

P =Ae-HRT;   lnP =lnA - HRT d lnPdT =  HRT2  

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