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Laws of Thermodynamics
GATE 2012
Medium
For an exothermic reversible reaction, which one of the following correctly describes the dependence of the equilibrium constant (K) with temperature (T) and pressure (P)?
- AK is independent of T and P
- BK increases with an increase in T and P
- CK increases with T and decreases with P
- K decreases with an increase in T and is independent of P
Explanation
By the van 't Hoff equation, dlnK/dT=ΔH°/(RT²). For an exothermic reaction, ΔH°<0, so K decreases as T increases. K (defined via activities/fugacities) depends only on T, not on P.
Source: GATE CH 2012 (2012)
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