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Q.

For which exothermic reaction is ΔE  more negative than ΔH ?

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a

Br2(l)⟶Br2(g)

b

H2(g)+F2(g)⟶2HF(g)

c

2C(s)+O2(g)⟶2CO(g)

d

2SO2(g)+O2(g)⟶2SO2(g)

answer is B.

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Detailed Solution

ΔE=ΔH−ΔngRT;Δng>0 and  ΔH<0

CO formation is exothermic and Δng=+1.

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