question_answer

Which of the following statements is correct? (Atomic number of Ni = 28)

A) \[Ni{{\left( CO \right)}_{4}}\] is diamagnetic and \[{{[NiC{{l}_{4}}]}^{2-}}\] and  \[{{[Ni{{(CN)}_{4}}]}^{2-}}\] are paramagnetic

B) \[Ni{{(CO)}_{4}}\] and \[{{[Ni{{(CN)}_{4}}]}^{2-}}\] are diamagnetic and \[{{[NiC{{l}_{4}}]}^{2-}}\] is paramagnetic

C) \[Ni{{(CO)}_{4}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\] are diamagnetic and \[{{[Ni{{(CN)}_{4}}]}^{2-}}\] is paramagnetic

D) \[{{[NiC{{l}_{4}}]}^{2-}}\] and \[{{[Ni{{(CN)}_{4}}]}^{2-}}\] are diamagnetic and \[Ni{{\left( CO \right)}_{4}}\] is paramagnetic

Correct Answer: B

Solution :

[b]