AgCl and NaCl are colourless. NaBr and NaI are also colourless but AgBr and AgI are coloured. This is due to

JEE Advanced Chemistry question

and are colourless. and are also colourless but and are coloured. This is due to

(A) polarises and Correct
(B) has unpaired d-orbital
(C) depolarises and
(D)None of the above is correct

Answer: (A)

Solution

is a hard, weakly polarising cation, so sodium halides remain essentially ionic and colourless regardless of the anion. , however, is small and strongly polarising; as the halide ion becomes larger and more polarisable (from to to ), distorts its

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Question ID VK-159699