1.

Amongst [NiCl_(4)]^(2-), [Ni(H_(2)O)_(6)]^(2+), [Ni("PP"h_(3))_(2)Cl_(2)], [Ni(CO)_(4)] and [Ni(CNO_(4))]^(2-) the paramagnetic species are

Answer»

`[NiCl_(4)]^(2-),[NI(H_(2)O)_(6)]^(2+), [Ni("PP"h_(3))_(2)Cl_(2)]`
`[Ni(CO)_(4)], [Ni("PP"h_(3))_(2)Cl_(2)], [NiCl_(4)]^(2-)`
`[Ni(CN)_(4)]^(2-), [Ni(H_(2)O_(6)]^(2+),[NiCl_(4)]^(2-)`
`[Ni"PP"h_(3))_(2)Cl_(2)], [Ni(CO)_(4)],[Ni(CN)_(4)]^(2-)`

Solution :`Ni^(2+)=3d^(8)4s^(0)`
(i) `[NiCl_(4)]^(2-)toCl^(-)` is weak ligand (spectrochemical sereis), so no pairing POSSIBLE.
CFSE < pariring energy.
(ii) `[Ni(H_(2)O)_(6)]^(2+)toH_(2)O` is weak field ligand. So,no pairing possible.
CFSE < Pairing energy.
(iii) `[Ni("PP"h_(3))_(2)Cl_(2)]to` Although `"PP"h_(3)` had d- acceptance but presence of Cl makes complex tetrahedral.


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