Question

The common feature of the species `N_(2)^(2-), O_(2)` and `NO_(-)` are
A. bond order three and isoelectronic
B. bond order two and isoelectronic
C. bond order three but not isoelectronic
D. bond order two but not isoelectronic

Answer 1

Correct Answer - b
`N_(2)^(2) : sigma 1s^(2), sigma **1s^(2), sigma 2s^(2), pi 2p_(x)^(2), sigma p _(z)^(2), pi 2p_(x)^(1), pi **2p_(y)^(1)`.
`B.O. N_(2)^(2-) = (10-6)/(2) = 2, B.O. = (10-6)/(2) = 2`
`NO^(-)` isolectronic with `O_(2) so B.O. = (10-6)/(2) = 2`
All have same number of welectrons `(i.e.), 16` so isolectronic.