A) \[_{6}{{C}^{14}}\]
B) \[\lambda =\text{2}.\text{31}\times \text{1}{{0}^{-\text{4}}}\text{ yea}{{\text{r}}^{\text{-1}}}\]
C) \[\text{4}\times \text{1}{{0}^{\text{2}}}\text{ years}\]
D) \[\text{3}.\text{5}\times \text{1}{{0}^{\text{4}}}\text{ years}\]
Correct Answer: D
Solution :
\[N{{i}^{2+}}=[Ar]3{{d}^{8}}\]Ni in presence of \[C{{N}^{-}}\]\[As{{[Ni{{(CN)}_{4}}]}^{2-}}\]has no unpaired electron, it is diamagnetic.
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