Which of the following equilibria shows little or no net reaction when the volume of...

Chemistry

JAMB 1992

Which of the following equilibria shows little or no net reaction when the volume of the system is decreased?

A. H₂_(g) + I₂_(g) ≈ 2HI_(g)
B. 2NO₂^(g) ≈ N₂O₄_(g)+O₄_(g)N₂O₄_(g)
C. PCI₅_(g) ≈ PCI₃_(g) + CI₂_(g)
D. ZnO_(s) + CO₂_(g) ≈ ZnCO₃_(g)

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Correct Answer: Option A

Explanation

Simply calculate the number of moles on both reactants side and products side, for each of the options. The one that has equal number of moles on both sides, shows little or no reaction when volume is decreased. That is according to Le chatelier's principle.

Based on the above, option A is the correct answer, with 2 moles each on both sides.

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