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Characteristics of Equilibrium Constant

Equilibrium c...

Question

Equilibrium constant Kp for following reaction :
$M g C O_{3} (s) \to M g O (s) + C O_{2} (g)$

K p = P_{c o_{2}}

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K p = P_{M g C O_{3}}

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K p = P_{C o_{2}} \times P_{C O_{2}}

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none of these

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Solution

The correct option is A $K p = P_{c o_{2}}$
The given reaction is :-
$M g {C O}_{3} (s) ⇌ M g O (s) + {C O}_{2} (g)$
Now, $K_{P} = \frac{P_{C O_{2}} . P_{M g O}}{P_{M g C O_{3}}}$
But, ${M g C O}_{3}$ and $M g O$ are pure solids.
So, $K_{P} = P_{C O_{2}}$ .

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