The number of paramagnetic species from the following is _______ . [ Ni ( CN ) 4 ] 2 - , [ Ni ( CO ) 4 ] , [ NiCl 4 ] 2 - , [ Fe ( CN ) 6 ] 4 - , [ Cu ( NH 3 ) 4 ] 2 + , [ Fe ( CN ) 6 ] 3 - and [ Fe ( H 2 O ) 6 ] 2 + [2023]

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Solution

Q.
The number of paramagnetic species from the following is _______ .

${[Ni {(CN)}_{4}]}^{2 -}, [Ni {(CO)}_{4}], {[{NiCl}_{4}]}^{2 -},$

${[Fe {(CN)}_{6}]}^{4 -}, {[Cu {({NH}_{3})}_{4}]}^{2 +},$

${[Fe {(CN)}_{6}]}^{3 -} and {[Fe {(H_{2} O)}_{6}]}^{2 +}$ [2023]

Ans.
(4)

S.No. Species E.C. Hybridisation Magnetic Character

(i) ${[Ni {(CN)}_{4}]}^{2 -}$ ${Ni}^{2 +} \Rightarrow 3 d^{8}$ $d s p^{2}$ Diamagnetic

(ii) ${[{NiCl}_{4}]}^{2 -}$ ${Ni}^{2 +} \Rightarrow 3 d^{8}$ $s p^{3}$ Paramagnetic

(iii) ${[Cu {(CN)}_{4}]}^{2 +}$ ${Cu}^{2 +} \Rightarrow 3 d^{9}$ $d s p^{2}$ Paramagnetic

(iv) ${[Cu {(CN)}_{4}]}^{3 -}$ ${Cu}^{+} \Rightarrow 3 d^{10}$ $s p^{3}$ Diamagnetic

(v) ${[Fe {(CN)}_{6}]}^{3 -}$ ${Fe}^{3 +} \Rightarrow 3 d^{5}$ $d^{2} s p^{3}$ Paramagnetic

(vi) ${[Fe {(CN)}_{6}]}^{4 -}$ ${Fe}^{2 +} \Rightarrow 3 d^{6}$ $d^{2} s p^{3}$ Diamagnetic

(vii) ${[Fe {(H_{2} O)}_{6}]}^{2 +}$ ${Fe}^{2 +} \Rightarrow 3 d^{6}$ $s p^{3} d^{2}$ Paramagnetic

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