A magnetic moment of 1.73 B.M. will be shown by one among the following:

Options

A. (a) `[Cu(NH_3)_4]^(2+)`
B. (b) `[Ni(CN)_4]^(2-)`
C. (c) `TiCl_4`
D. (d) `[CoCl_6]^(4-)`

Answer

A

Explanation

`:' sqrt(n(n+2))=1.73`
`:. n=1`, i.e., species has one unpaired electron. Thus species is `[Cu(NH_3)_4]^(2+)`
`Cu^(2+)` in `[Cu(NH_3)_4]^(2+)` has configuration

One electron is shifted from `3d` to `4p` in complex formation.