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JEE Main levelOne or more correct optionsDifficulty 2 of 3ce032

The equilibrium $H X_{2} (g) + I X_{2} (g) 2 HI (g)$ is set up in a closed vessel at constant temperature, and the volume is then halved. Which statements are correct?

A $K_{c}$ doubles
BThe amounts (in mol) of $H X_{2}$ , $I X_{2}$ and $HI$ remain unchanged
CThe equilibrium shifts towards $HI$
DThe violet colour due to $I X_{2}$ becomes more intense

Answer: B, D

Both sides have equal gas moles, so

Q_{c}

remains equal to

K_{c}

and nothing shifts; amounts are unchanged.

K_{c}

is constant at fixed temperature. Halving the volume doubles

[I X_{2}]

, so the colour deepens.

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