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Characteristics of Equilibrium Constant

XY 2 g dissoc...

Question

$X Y_{2}$ (g) dissociates as $X Y (g) + Y (g)$ . When the initial pressure is 600 mm of Hg, the total pressure at equilibrium developed is 800 mm of Hg. Therefore pressure of Y at equilibrium is

200

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100

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150

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Solution

The correct option is A 200
$\begin{matrix} I n i t i a l p r e s s u r e & x y_{2} (g) 600 m m & ⇌ & x y (g) & + & y (g) a t e q u i l i b r i u m & 600 - p^{1} & p^{1} & p^{1} \end{matrix}$
Total pressure at equilibrium $= 600 - p^{1} + p^{1} + p^{1}$
$= 600 + p^{1}$
$600 + p^{1} = 800$
$p^{1} = 800 - 600 = 200 mm of Hg$

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