Coordination Compounds 2 Question 26
####28. Among $\left[Ni(CO) _4\right],\left[NiCl _4\right]^{2-},\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$, $Na _3\left[CoF _6\right], Na _2 O _2$ and $CsO _2$, the total number of paramagnetic compounds is
(2016 Adv.)
(a) 2
(b) 3
(c) 4
(d) 5
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Answer:
Correct Answer: 28. (c)
Solution:
| Compounds | Hybridisation | Unpaired electron(s) |
Magnetic character |
|---|---|---|---|
| $Ni(CO) _4$ | $s p^{3}$ | No | Diamagnetic |
| $\left[NiCl _4\right]^{2-}$ | $s p^{3}$ | two | Paramagnetic |
| $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ | $s p^{3} d^{2}$ | No | Diamagnetic |
| $Na _3\left[CoF _6\right]$ | $s p^{3} d^{2}$ | three | Paramagnetic |
| $Na _2 O _2$ | - | No | Diamagnetic $\left(O _2^{2-}\right)$ |
| $CsO _2$ | - | One | Paramagnetic |
| $O _2^{-}$(superoxide ion is paramagnetic) |
