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QAIPMT-2009-Ch-2137: NEET 2009 Chemistry - Class 12 AIPMT-2009-Ch-2137 Solution: Which of the following complex ions is expected to absorb…

Which of the following complex ions is expected to absorb visible light? (At. nos. Zn = 30 Sc = 21 Ti = 22 Cr = 24)

[Ti(en)_2(NH_3)_2]^{4+}

[Cr(NH_3)_6]^{3+}

[Zn(NH_3)_6]^{2+}

[Sc(H_2O)_3(NH_3)_3]^{3+}

Multiple Choice Options

A Cu 2 Cl 2 and NiCl 4 2 $-$ _
B TiF 6 2 $-$ _ and Cu 2 Cl 2
C CoF 6 3 $-$ _ and NiCl 4 2 $-$ _
D TiF 6 2 $-$ _ and CoF 6 3 $-$ _

Step-by-Step Verified Solution

In TiF 6 2� , Ti is present as Ti +4 Ti +4 = [Ar] 3d 0 4s 0 Hence, TiF 6 2� is colourless due to empty d orbital. In Cu 2 Cl 2 , Cu is present as Cu + Cu + = [Ar] 3d 10 4s 0 Due to absence of unpaired electrons, Cu 2 Cl 2 is colourless.

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