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Coordination Compounds

Question
CBSEENCH12007431
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What will be the correct order for the wavelength of absorption in the visible region for the following:
[Ni (NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6]2+?

Solution

The central metal atom is same in all compound. Thus adsorption in the visible reigon depend on the ligand. according to spectrochemical series increasing order of ligand is H2O < NH3 < NO2-. Hence the correct order for wavelength is 
[Ni (NO2)6]4–<[Ni(NH3)6]2+<[Ni(H2O)6]2+.

(i) [Ni– (NO2)6]4– = wavelength of light is 498 nm.
(ii) [Ni(NH3)6]2+= wavelength of light is 475 nm.
(iii) [Ni(H2O)6]2+ = wavelength of light is 500nm.

Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:
Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:
Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH3)6]Cl3
(ii) [Co(NH3)5Cl]Cl2
(iii) K3[Fe(CN)6]
(iv) K3[Fe(C2O4)3]
(v) K2[PdCl4]
(vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i)    K[Cr(H2O)2(C2O4)2],                      (ii) [Co(en)3Cl3,
(iii) [Co(NH3)5(NO2)]|NO3]2,                 (iv) [Pt(NH3)(H2O)Cl2]

Explain on the basis of valence bond theory that [Ni(CN)4]2–  ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.

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