One mole of He (g, colourless) is added to the equilibrium mixture containing N₂O₄ (g, colourless) and NO₂ (g, red-brown) present in a cylinder piston arrangement maintained at constant pressure and t

Question

One mole of He (g, colourless) is added to the equilibrium mixture containing N₂O₄ (g, colourless) and NO₂ (g, red-brown) present in a cylinder piston arrangement maintained at constant pressure and temperature. It will result

Prashant Kotian · Accepted Answer

Correct answer: B. Adding He at constant pressure increases the volume of the container. While this shifts the equilibrium forward to produce more moles of NO₂, the overall volume increase is proportionally larger, resulting in a net decrease in the concentration of NO₂ (partial pressure drops). Hence, the red-brown colour lightens. Therefore, correct answer is B.

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