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Question

Enthalpy change equal internal energy change when

A
all the reactants and products are in solution
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B
reaction is carried out in a closed vessel
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C
number of moles of gaseous reactants and that of products is equal
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D
reaction is carried out at constant pressure
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Solution

The correct options are
A all the reactants and products are in solution
B reaction is carried out in a closed vessel
C number of moles of gaseous reactants and that of products is equal
As we know,
ΔH=ΔU+ΔnRT
when
Δn=0=nPnR
ΔH=ΔU
Also, when volume change is negligible, ΔH=ΔU

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