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NEET2009Chemistryd and f Block ElementsActual

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

Options

  1. A[ Zn ( NH ₃ )₆ ]²⁺
  2. B[ Sc ( H ₂ O )₃ ( NH ₃ )₃ ]³⁺
  3. C[ Ti ( en )₂ ( NH ₃ )₂ ]⁴⁺
  4. D[ Cr ( NH ₃ )₆ ]³⁺

Correct answer

D. [ Cr ( NH ₃ )₆ ]³⁺

Step-by-step solution

Cr ³⁺ Is ^2, 2 ~s ^2 2 p ^6, 3 ~s ^2 3 p ^6 3 ~d ^3 Unpaired electron shows colour so absorb visible light.

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