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For the equilibrium N2 + 3H2 ⇌ 2NH3, the equilibrium constant Kc is independent of which of the following? (a) initial concentrations of the reactants (b) total pressure (c) temperature (d) presence of a catalyst

1. Only c
2. a, b, c
3. a, b, d
4. a, b, c, d

Correct answer: a, b, d

Solution

Kc is fixed for a reaction at a given temperature and is unaffected by initial concentrations, total pressure, or a catalyst; only temperature changes Kc.

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