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NEET levelSingle correct optionDifficulty 1 of 3ce004

At a certain temperature, $K_{c} = 5.0$ for $X (g) Y (g)$ . What is $K_{c}$ for the reaction $2 Y (g) 2 X (g)$ at the same temperature?

A0.20
B0.04
C0.40
D25.0

Answer: B

Reversing a reaction inverts

K_{c}

to

1/5.0 = 0.20

, and doubling the coefficients squares it. Hence

K_{c} = (1/5.0)^{2} = 0.04

.

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