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Question

In which of the following reactions, ΔH>ΔU?

A
H2(g)+I2(g)2HI(g)
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B
PCl5(g)PCl3(g)+Cl2(g)
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C
2H2O2(l)2H2O(l)+O2(g)
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D
C(s)+O2(g)CO2(g)
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Solution

The correct options are
A PCl5(g)PCl3(g)+Cl2(g)
C 2H2O2(l)2H2O(l)+O2(g)
As we know,
ΔH=ΔU+ΔnRT, where Δn=nPnR (n = number of moles)
H2(g)+I2(g)2HI(g) Δn=0
PCl5(g)PCl3(g)+Cl2(g) Δn=1
2H2O2(l)2H2O(l)+O2(g) Δn=1
C(s)+O2(g)CO2(g) Δn=0

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