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In which of the following reactions, increase in the volume at constant temperature does not affect the number of moles at equilibrium

ChemistryChemical EquilibriumJEE MainJEE Main 2002

Options:

A
$2 \mathrm{NH}_3 \rightarrow \mathrm{N}_2+3 \mathrm{H}_2$
B
$\mathrm{C}(\mathrm{g})+(1 / 2) \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})$
C
$\mathrm{H}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}_2(\mathrm{~g})$
D
none of these