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Q.

Choose the reaction in which ∆H is not equal to ∆U

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a

C(gr)+O2(g)→CO2(g)

b

C2H4(g)+H2(g)→C2H6(g)

c

2C(gr)+H2(g)→C2H2(g)

d

H2(g)+I2(g)→2HI(g)

answer is B.

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Detailed Solution

ΔH=ΔU+ΔnRT When Δng=0 then ΔH=∆UFor (a) ,Δng=0(B)Δng=1⋅2=−1 (C) Δng=0 (D)Δng=2−2=0 (E) Ang=2−2=0
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