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Q.

The equilibrium constant for the reaction $N_{2} (g) + O_{2} (g) ⇌ 2 NO (g) is 4 \times 10^{- 4}$ at 2OOK. In presence of a catalyst, equilibrium is attained ten times faster. Therefore, the equilibrium constant in presence of the catalyst at 200 K is :

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a

$40 \times 10^{- 4}$

b

$4 \times 10^{- 3}$

c

$4 \times 10^{- 4}$

d

difficult to compute without more data

answer is B.

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Detailed Solution

Equilibrium constant is only temperature dependant.

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The equilibrium constant for the reaction N2(g)+O2(g)⇌2NO(g) is 4×10-4 at 2OOK. In presence of a catalyst, equilibrium is attained ten times faster. Therefore, the equilibrium constant in presence of the catalyst at 200 K is :