MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical EquilibriumLe-Chatelier’s Principle
For the gas phase reaction 2 NO N2 + O2, H = – 43.5 Kcal mol–1which one of the statement below is true for N2 (g) + O2 (g) 2 NO (g)
A.K is independent of T
B.K increases as T decreases
C.K decreases as T decreases✓ Correct
D.K varies with the addition of NO.
Explanation
As the enthalpy of the given reaction is negative, so, the enthalpy of its reverse reaction is positive, hence, it is an endothermic reaction. So, according to the Le-Chatelier’s principle, when the temperature decreases, the reaction is directed in backwards direction for an endothermic reaction. Due to which K of the reaction decreases. Therefore, option (c) is the correct answer.
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