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NEET levelSingle correct optionDifficulty 1 of 3ce175

A sealed tube holds the equilibrium $N X_{2} O X_{4} (g) 2 NO X_{2} (g)$ with $Δ H = + 57 kJ$ ( $N X_{2} O X_{4}$ is colourless, $NO X_{2}$ is brown). When the tube is heated, the colour

Abecomes darker
Bdoes not change
Cbecomes lighter
Dfirst darkens and then fades back to the original

Answer: A

The forward reaction is endothermic, so heating shifts the equilibrium forward, producing more brown

NO X_{2}

.

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