MCQ
A solid $XY$ kept in an evacuated sealed container undergoes decomposition to form a mixture of gases $X$ and $Y$ at temperature $T$. The equilibrium pressure is $10\, bar$ in the vessel. $K_p$ for this reaction is
  • $25$
  • B
    $100$
  • C
    $10$
  • D
    $5$

Answer

Correct option: A.
$25$
a
$XY(s) \leftrightarrow \mathop {X(g)}\limits_P  + \mathop {Y(g)}\limits_P $

At eq.,

Total pressure $ = 2P = 10\,bar$

$\therefore \,p = 5;\,Now\,{K_p} = ({P_x})({P_y}) = {p^2} = 25$

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