1.

Among [Ni(CO)_(4)],[NiCl_(4)]^(2-),[Co(NH_(3))_(4)Cl_(2)]ClNa_(3)[CoF_(6)],Na_(2)O_(2) and CsO_(2) the total number of paramagnetic compounds is

Answer»

2
3
4
5

Solution :`[NI(CO)_(4)]`:

`Na_(2)O_(2)`
contains `O_(2)^(2-)` (peroxide) which is DIAMAGNETIC.
`CsO_(2)` contain `O_(2)^(-)` (superoxide ion) which is paramagnetic.


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