Amongst [NiCl4]2-, [Ni(H2O)6]2+,[Ni(PPh3)2Cl2], [Ni(CO)4] and [Ni(CN)4]2-. the paramagnetic species are

Question

Amongst [NiCl4]2-, [Ni(H2O)6]2+,[Ni(PPh3)2Cl2], [Ni(CO)4] and [Ni(CN)4]2-. the paramagnetic species are (A) [NiCl4]2-, [Ni(H2O)6]2+,[Ni(PPh3)2Cl2] (B) [Ni(CO)4],[Ni(PPh3)2Cl2],[NiCl4]2- (C) [Ni(CN)4]2-, [Ni(H2O)6]2+,[NiCl4]2- (D) [Ni(PPh3)2Cl2], [Ni(CO)4],[Ni(CN)4]2-

Tardigrade Admin · Accepted Answer

Species having unpaired electrons are paramagnetic

N i^{2 +} = [A r] 3 d^{8}

(i) In

[N i C l_{4}]^{2 -}

and

N i (H_{2} O)_{6}]^{2 +}

ligands

C l^{-}

and

H_{2} O

are weak ligands, therefore no pairing will be possible. Thus, there are two unpained electrons.
(ii) In

[N i (P h_{3})_{2} C l_{2}}

although

PP h_{3}

has
d-acceptance nature but presence of

Cl

, makes electrons unpaired.

Q. Amongst $[N i C l_{4}]^{2 -}, [N i (H_{2} O)_{6}]^{2 +}, [N i (PP h_{3})_{2} C l_{2}], [N i (CO)_{4}]$ and $[N i (CN)_{4}]^{2 -}$ . the paramagnetic species are

$[N i C l_{4}]^{2 -}, [N i (H_{2} O)_{6}]^{2 +}, [N i (PP h_{3})_{2} C l_{2}]$

$[N i (CO)_{4}], [N i (PP h_{3})_{2} C l_{2}], [N i C l_{4}]^{2 -}$

$[N i (CN)_{4}]^{2 -}, [N i (H_{2} O)_{6}]^{2 +}, [N i C l_{4}]^{2 -}$

$[N i (PP h_{3})_{2} C l_{2}], [N i (CO)_{4}], [N i (CN)_{4}]^{2 -}$

Q. Amongst [NiCl4​]2−,[Ni(H2​O)6​]2+,[Ni(PPh3​)2​Cl2​],[Ni(CO)4​] and [Ni(CN)4​]2−. the paramagnetic species are

[NiCl4​]2−,[Ni(H2​O)6​]2+,[Ni(PPh3​)2​Cl2​]

[Ni(CO)4​],[Ni(PPh3​)2​Cl2​],[NiCl4​]2−

[Ni(CN)4​]2−,[Ni(H2​O)6​]2+,[NiCl4​]2−

[Ni(PPh3​)2​Cl2​],[Ni(CO)4​],[Ni(CN)4​]2−

Q. Amongst $[N i C l_{4}]^{2 -}, [N i (H_{2} O)_{6}]^{2 +}, [N i (PP h_{3})_{2} C l_{2}], [N i (CO)_{4}]$ and $[N i (CN)_{4}]^{2 -}$ . the paramagnetic species are

$[N i C l_{4}]^{2 -}, [N i (H_{2} O)_{6}]^{2 +}, [N i (PP h_{3})_{2} C l_{2}]$

$[N i (CO)_{4}], [N i (PP h_{3})_{2} C l_{2}], [N i C l_{4}]^{2 -}$

$[N i (CN)_{4}]^{2 -}, [N i (H_{2} O)_{6}]^{2 +}, [N i C l_{4}]^{2 -}$

$[N i (PP h_{3})_{2} C l_{2}], [N i (CO)_{4}], [N i (CN)_{4}]^{2 -}$