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

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Compound/Ion Unpaired Electron Magnetic nature of compound 1] N i C O 4 3d 10 , sp 3 0 Diamagnetic 2] C o N H 3 4 C l 2 C l 3 d 6 , d 2 sp 3 0 Paramagnetic 3] N i C l 4 2 - 3 d 8 , sp 3 2 Diamagnetic 4] N a 3 C o F 6 3 d 6 , sp 3 d 2 4 Paramagnetic 5] N a 2 O 2 O 2 2 - 0 Diamagnetic 6] C s O 2 O 2 - 1 1 Paramagnetic So, the total number of paramagnetic compounds is 3 .

	Compound/Ion		Unpaired Electron	Magnetic nature of compound
1]	$[N i {(C O)}_{4}]$	${3d}^{10}, {sp}^{3}$	$0$	Diamagnetic
2]	$[C o {(N H_{3})}_{4} C l_{2}] C l$	$3 d^{6}, d^{2} {sp}^{3}$	$0$	Paramagnetic
3]	${[N i C l_{4}]}^{2 -}$	$3 d^{8}, {sp}^{3}$	$2$	Diamagnetic
4]	$N a_{3} [C o F_{6}]$	$3 d^{6}, {sp}^{3} d^{2}$	$4$	Paramagnetic
5]	$N a_{2} O_{2}$	$O_{2}^{2 -}$	$0$	Diamagnetic
6]	$C s O_{2}$	$O_{2}^{- 1}$	$1$	Paramagnetic

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