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JEE Main 2012 Chemistry question

ChemistryEquilibriumJEE Main 2012

Given (i) HCN(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + CN^-(aq) (ii) CN^-(aq) + H_2O(l) \rightleftharpoons HCN(aq) + OH^-(aq) . These equilibria show the following order of the relative base strength,

Answer: (2)

Solution

From (ii), is small, so is a stronger base than (equilibrium lies left).

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Question ID VK-103485