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)


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