Which of the following species is/are paramagnetic?
`Fe^(2+),Zn^(0),Hg^(2+),Ti^(4+)`

Options

A. `Fe^(2+)"only"`
B. `Zn^(0) and Ti^(4+)`
C. `Fe^(2+)and Hg^(2+)`
D. `Zn^(0) and Hg^(2+)`

Answer

A

Explanation

`Fe^(2+)(Z=26)3d^(6)`, one electron unpaired electron
`Zn^(0)(Z=30)4s^(2)3d^(10),"No unpaired electron"`
`Hg^(2+)(Z=80)6d^(10),"No unpaired electron"`
`Ti^(4+)(Z=22)[Ar]^(18),"No unpaired electron"`
Only `Fe^(2+)` is paramagnetic in nature.