Among [Ni(CO)_4] , [NiCl_4]^ 2- , [Co(NH_3)_4Cl_2]Cl , Na_3[CoF_6] , Na_2O_2 and CsO_2 , the total number of paramagnetic compounds is

JEE Advanced 2016 Chemistry question

Among , , , , and , the total number of paramagnetic compounds is

(A)2
(B)3Correct
(C)4
(D)5

Answer: (B)

Solution

: Ni(0), after pairing by the strong-field CO, diamagnetic. : Ni(II) , tetrahedral with weak-field , 2 unpaired electrons, paramagnetic. : Co(III) , low spin , diamagnetic. :

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Question ID VK-026505