Consider the two gaseous equilibria,
$A_{2} ⇌ 2 A A B ⇌ A + B$
Assume that the $Δ_{r} G^{0}$ and therefore equilibrium constant are same for both. An enclosure is initially packed with A and B in atomic state. B never dimerises. Which of the following is/are must be correct?

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Partial pressure of AB is less than partial pressure of $A_{2}$

Extent of formation of AB is more than that of $A_{2}$

Number of moles of AB is same as number moles of $A_{2}$

Mole fraction of AB at equilibrium is dependent on initial partial pressures of A and B.

answer is D.

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Detailed Solution

If an enclosure at high temperature contains equal number of atoms A and B, then, when the temperatures is lowered, and molecules $A_{2}$ , AB, $B_{2}$ form, they do not form in equal numbers, but in the ratio 1:2:1.

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