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Q.

The magnitude of enthalpy changes for irreversible adiabatic expansion of a gas from 1L to 2L is ΔH1 and for reversible adiabatic expansion for the same expansion is  ΔH2Then :

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a

ΔH1=ΔH2 enthalpy being a state function

b

ΔH1>ΔH2

c

ΔH1<ΔH2

d

ΔH1=ΔE1, and ΔH2=ΔE2 where ΔE1 and ΔE2 are magnitudes of change in internal energy of gas in there expansions respectively.

answer is B.

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Detailed Solution

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Since, initial positions are different so, ΔH will be different 

Final temp in irrev. is more than rev. as wirrev  is less in magnitude.

ΔHrev>ΔHirrev

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