Among the following , the paramagnetic compound is

Options

A. `Na_2O_2`
B. `O_3`
C. `N_2O`
D. `KO_2`

Answer

D

Explanation

`KO_2` carries superoxide ion, `O_2^(-)` whose molecular orbital electronic configuration is
`sigma_(1s)^(2)sigma_(1s)^(**2)sigma_(2s)^(2)sigma_(2s)^(**2)sigma_(2p_x)^(2)pi_(2p_y)^2pi_(2p_z)^2pi_(2p_y)^(**2)pi_(2p_z)^(**1)`
Thus it has one unpaired electron and hence paramagnetic in nature with magnetic moment =
`sqrt(n(n+2))=sqrt(1(1+2))=1.73B.M.`