6. Among [Ni(CO)4], (NiCl4]2-, [Co(NH3)4Cl2]CI, Na3 [CoF6] , Na202, and Cs02, the total number of paramagnetic compounds is (a) 2 (b) 3 (6) 4 (d) 5

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Q. Among

[N i (C O)_{4}],

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

[C o (N H_{3})_{4} C l_{2}] C l

N a_{3} [C o F_{6}],

N a_{2} O_{2}

and

C s O_{2}

, the total number of paramagnetic compounds is:

Q. Among

[N i (C O)_{4}]

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

[C o (N H_{3})_{4} C l_{2}] C l

N a_{3} [C o F_{6}]

N a_{2} O_{2}

and

C s O_{2}

, the total number of paramagnetic compounds are:

Among $[N i (C o)_{4}], [N i C l_{4}]^{2 -}, [C o (N H_{3})_{4} C l_{2}] C l, N a_{2} [C o F_{6}]^{3 +}, N a_{2} O_{2} a n d C s O_{2},$ the total number of paramagnetic compounds is

Q. Among

[N i (C O)_{4},, [N i C l_{4}]^{2 -}, [C o (N H_{2}), C l_{2}] C l, N a_{3} [C o F_{6}], N a_{2} O_{2} and C s O_{2} .]

the total number of paramagnetic compound is

Q. Among

N i (C O)_{4}, [N i (C N)_{4}]^{2 -} a n d [N i C l_{4}^{2 -}]

[IIT-JEE, 1991]

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