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Which of the following complex ions is expected to absorb visible light?

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Which of the following complex ions is expected to absorb visible light?

(a) [Ti(en)2(NH3)2]+4

(b) [Cr(NH3)6]+3

(c) [Zn(NH3)6]+2

(d) [SC(H2O)3(NH3)3]+3

(At. No: Zn = 30, Sc = 21, Ti = 22; Cr = 24) ,

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Correct option is (b) [Cr(NH3)6]+3

d0 (Sc+3, Ti+4) and d10 (Zn+2) species will not absorb visible light and are colurless whereas Cr+3 (d3) can undergo d-d transition on absorption of visible light of particular wave length and will be coloured.

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