MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical EquilibriumLe-Chatelier’s Principle

Change in volume of the system does not alter the number of moles in which of the following equilibrium

A.N2(g)+ O2(g) 2NO(g)✓ Correct

B.PCl5 (g) PCl3 (g) + Cl2(g)

C.N2(g) + 3H2(g) 2NH3(g)

D.SO2Cl2(g) SO2(g) + Cl2(g)

Explanation

Let us consider the change in moles of given reactions as follows- In option A, number of moles of product – reactant= 2- 2= 0 In option B, number of moles of product – reactant= 2- 1=1 In option C, number of moles of product – reactant= 2- 4=-2 In option D, number of moles of product – reactant= 2- 1=1 Clearly in option A, the number of moles on both reactant and product side are same. Therefore, any change in volume doesn’t affect it.

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