MHT CET Chemistry question

Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition, but not using Bronsted-Lowry definition?

(A)
(B)
(C)\mathrm{4NH_3 + [Cu(H_2O)_4]^{2+} \rightleftharpoons [Cu(NH_3)_4]^{2+} + 4H_2O}Correct
(D)\mathrm{2NH_3 + H_2SO_4 \rightleftharpoons 2NH_4^+ + SO_4^{2-}}

Answer: (C)

Solution

Options (a), (b) and (d) involve transfer of a proton and so are Bronsted-Lowry acid-base reactions; in (c) no proton is transferred, but

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Question ID VK-059032