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Colours in Coordination Compounds

Which of the ...

Question

Which of the following complex ion(s) is/are not expected to absorb visible light ?

[Ti(en)

_{2}

(NH

_{3}

)

_{2}

]

^{4 +}

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[Cr(NH

_{3}

)

_{6}

]

^{3 +}

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[Zn(NH

_{3}

)

_{6}

]

^{2 +}

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[Sc(H

_{2}

_{3}

(NH

_{3}

)

_{3}

]

^{3 +}

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Solution

The correct options are
A [Ti(en) $_{2}$ (NH $_{3}$ ) $_{2}$ ] $^{4 +}$
C [Zn(NH $_{3}$ ) $_{6}$ ] $^{2 +}$
D [Sc(H $_{2}$ O) $_{3}$ (NH $_{3}$ ) $_{3}$ ] $^{3 +}$
[Ti(en) $_{2}$ (NH $_{3}$ ) $_{2}$ ] $^{4 +}$
$T i^{+ 4} = d^{0}$
[Zn(NH $_{3}$ ) $_{6}$ ] $^{2 +}$
$Z n^{+ 2} = d^{10}$
[Sc(H $_{2}$ O) $_{3}$ (NH $_{3}$ ) $_{3}$ ] $^{3 +}$
$S c^{+ 3} = d^{0}$
As they all have zero unpaired d electrons so they are not expected to absorb visible light.

Suggest Corrections

Similar questions

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

(At number Zn = 30, Sc = 21, Ti = 22, Cr = 24)

Q. The correct statement on the isomerism associated with the following complex ions is:
(a) [Ni(H

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]

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(b) [Ni(H

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\overset{}{\to}

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Q. At

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the self-ionisation constant (ionic product) of

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.
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Which of the following complex ion(s) is/are not expected to absorb visible light ?

The correct options are A [Ti(en)2(NH3)2]4+ C [Zn(NH3)6]2+ D [Sc(H2O)3(NH3)3]3+[Ti(en)2(NH3)2]4+Ti+4=d0[Zn(NH3)6]2+Zn+2=d10[Sc(H2O)3(NH3)3]3+Sc+3=d0As they all have zero unpaired d electrons so they are not expected to absorb visible light.