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JAMB Chemistry 2023 Paper

Question : 10

Total: 82

Solution:

Concept:

Reversing a chemical reaction gives the reciprocal of the original equilibrium constant.

Explanation:

For the forward reaction

aA + bB \rightleftharpoons cC + dD

, the equilibrium constant is:

K_c = \frac{[C]^c[D]^d}{[A]^a[B]^b}

When the reaction is reversed:

cC + dD \rightleftharpoons aA + bB

The new equilibrium constant becomes:

K_c' = \frac{[A]^a[B]^b}{[C]^c[D]^d} = \frac{1}{K_c}

Therefore, the value becomes the reciprocal of the original

K_c

Answer:

D. It becomes the reciprocal of the original value.

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