Question

Which of the following has magnetic moment of 1.73 B.M. (approx.)?

• A. $[CoC{l}_6{]}^{4-}$
• B. $\left[Fe\right(CN{)}_6{]}^{3-}$
• C. $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$
• D. $\left[Ni\right(CO{)}_4]$

Answer 1

The correct option is C $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$

$\left[Cu\right(N{H}_3{)}_4{]}^{2+}$ has one unpaired electron. Therefore, its magnetic moment,
$\mu =\sqrt{n(n+2)}=\sqrt{1(1+2)}=\sqrt{3}$
= 1.73 B.M