Addition of water to which of the following equilibria causes it to shift in the backward direction ?

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CH3NH2(aq) + H2O(l) ⇌ CH3N+H3(aq) + OH-(aq)

AgCl(s) ⇌ Ag+ + Cl-(aq)

HCN(aq) + H2O(l) ⇌ H3O+(aq) + CN-(aq)

[Cr(dien)2]3+(aq) + 3H2O(l) + 3Cl-(aq) ⇌ [Cr(H2O)3Cl3](aq) + 2 dien (aq)

answer is D.

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Detailed Solution

The addition of water to the system will dilute all of the aqueous species reducing their concentration.On dilution there is greater change of concentration of aqueous species on the left hand side , the reaction will shift to left hand side.( 7 moles on left hand side and 3 moles on right hand side).

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