Q.

The reaction is reversible if it is carried out

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At constant pressure

At constant temperature

In an open vessel

In a closed vessel

answer is D.

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Detailed Solution

This cannot be a reversible reaction if carried out in open vessel (at constant pressure) because H2 (g) escapes out. In such case backward reaction cannot occur. Equilibrium state can be attained only in closed vessel for all the reversible reactions occuring in closed vessel.

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