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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc070

Select the complexes in which no d-d transition is possible (expected to be colourless).

A $[Cu (CN) X_{4}] X^{3 -}$
B $[Mn (CN) X_{6}] X^{4 -}$
C $[Zn (NH X_{3}) X_{4}] X^{2 +}$
D $[TiF X_{6}] X^{2 -}$

Answer: A, C, D

Cu:

x - 4 = - 3

gives Cu(I),

d^{10}

. Ti:

x - 6 = - 2

gives Ti(IV),

d^{0}

. Zn(II) is

d^{10}

. Mn:

x - 6 = - 4

gives Mn(II),

d^{5}

, which has a partly filled d subshell and so can show d-d transitions.

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