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  • Can someone help me with this, Which of the following complex ion is not expected to absorb visible light?

Which of the following complex ion is not expected to absorb visible light?

  • Option 1)

    \left [ Ni(CN)_{4} \right ]^{2-}

  • Option 2)

    \left [ Cr(NH_{3})_{6} \right ]^{3+}

  • Option 3)

    \left [ Fe(H_{2}O)_{6} \right ]^{2+}

  • Option 4)

    \left [ Ni(H_{2}O)_{6} \right ]^{2+}

 

Answers (1)

best_answer

As we learnt in 

Magnetic Moments (spin only) -

\sqrt{n\left ( n+2 \right )} where n= number of unpaired electron.

- wherein

Number of unpaired e^{-} s and corresponding magnetic moments

1\rightarrow 1.7\\2\rightarrow 2.8\\3\rightarrow 3.9\\4\rightarrow 4.9\\5\rightarrow 5.9

 

 To absorb visible light, the complex ion must leave a central atom with  impaired e^{-}s

Electronic  config of Ni^{2+}\::\:3d^{8}\:4s^{\circ}\:4p^{\circ}

In a complex with CN^{-},\:CN^{-} living the strong field ligand will pair up 3d electrons of Ni^{2+} and the complex will undergo d sp^{2} hybridization.

Electronic config of Ni^{2+} in [Ni(CN)_{4}]^{2-}

Because of an absence of unpaired e^{-}s [Ni(CN)_{4}]^{2-} will not absorb visible light.

 


Option 1)

\left [ Ni(CN)_{4} \right ]^{2-}

This option is correct.

Option 2)

\left [ Cr(NH_{3})_{6} \right ]^{3+}

This option is incorrect.

Option 3)

\left [ Fe(H_{2}O)_{6} \right ]^{2+}

This option is incorrect.

Option 4)

\left [ Ni(H_{2}O)_{6} \right ]^{2+}

This option is incorrect.

Posted by

Plabita

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