question_answer

The magnetic moment of a salt containing \[Z{{n}^{2+}}\] ion is

A)  \[0\]              

B)  \[1.87\]

C)  \[5.92\]            

D)  \[2\]

Correct Answer: A

Solution :

 Magnetic moment of \[Z{{n}^{2+}}\] \[\mu \]effective \[=\sqrt{n(n+2)}\] BM where, n = Number of unpaired electrons \[_{30}Zn=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}\] \[Z{{n}^{2+}}=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}\] So, magnetic moment of \[Z{{n}^{2+}}=\] zero