1.

Which of the following complex ions is expected to absorb visible light ? [At. No. Zn = 30, Sc = 21, Ti = 22, Cr = 24]

Answer»

`[Ti(en)_(2)(NH_(3))_(2)]^(4+)`
`[Cr(NH_(3))_(6)]^(3+)`
`[ZN(NH_(3))_(6)]^(2+)`
`[Sc(H_(2)O)_(3)(NH_(3))_(3)]^(3+)`

Solution :`d^(0)(Ti^(4+), Sc^(3+))` and `d^(10)(Zn^(2+))`species will not absorb VISIBLE light and are COLOURLESS whereas `d^(3)(Cr^(3+))` can undergo d-d transition on absorption of visible light of a particular wavelength and will be coloured.


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