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JEE Main levelSingle correct optionDifficulty 2 of 3ce190

Argon is added to $N X_{2} O X_{4} (g) 2 NO X_{2} (g)$ at equilibrium while temperature and total pressure are kept constant. Which pair of changes occurs?

A $α$ of $N X_{2} O X_{4}$ increases; $K_{p}$ increases
B $α$ of $N X_{2} O X_{4}$ increases; $K_{p}$ unchanged
C $α$ of $N X_{2} O X_{4}$ decreases; $K_{p}$ unchanged
D $α$ of $N X_{2} O X_{4}$ unchanged; $K_{p}$ unchanged

Answer: B

At constant total pressure, argon dilutes the reacting gases (partial pressures fall). Since

Δ n_{g} = + 1

, the equilibrium shifts forward and

α

rises.

K_{p}

depends on temperature only.

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