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Coordination Compounds

Question
CBSEENCH12011394
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In which of the following pairs are both the ions coloured in aqueous solution?

(At. no.: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 2)

  • Ni2+, Ti3+

  • Sc3+, Ti3+

  • Sc3+,Co2+

  • Ni2+, Cu+

Solution

A.

Ni2+, Ti3+

Ni28 = 1s2s, 2s2, 2p6, 3s2,3p6,3d8,4s2


Ni2+ = 1s2, 2s2, 2p6, 3s2,3p6,3d8
Ti22 = 1s2,2s2, 2p6, 3s2,3p6,3d2,4s2

Ti3+ = 1s2, 2s2, 2p6, 3s2,3p6,3d1
Sc21 = 1s2, 2s2, 2p6, 3s2,3p6,3d1,4s2
Sc3+ = 1s2, 2s2, 2p6, 3s2,3p6
(unpaired electron in d -orbital is not possible)
Cu29 = 1s2, 2s2, 2p6, 3s2,3p6,3d10,4s1
Cu+ =  1s2, 2s2, 2p6, 3s2,3p6,3d10

Hence, in above ions, Ni2+ and Ti3+ ions are coloured ions in aqueous solution due to presence of unpaired electrons in d -sub shell.

Some More Questions From Coordination Compounds Chapter

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.

Predict the number of unpaired electrons in the square planar [Pt(CN)4,]2– ion.

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