Chemical Bonding And Molecular Structure Ques 24
24. The number of anti-bonding electron pairs in $O_2^{-2}$ molecular ion on the basis of molecular orbital theory is, (Atomic number ofO is 8)
[1998]
(a) 5
(b) 2
(c) 3
(d) 4
Show Answer
Answer:
Correct Answer: 24.(d)
Solution:
(d) Total no. of electrons in $O_2{ }^{2-}=16+2=18$ Distribution of electrons in molecular orbital $\sigma 1 s^2, \sigma^* 1 s^2, \sigma 2 s^2, \sigma^* 2 s^2,\sigma 2 p_x^2, \pi 2 p_y^2$
$\pi 2 p_z^2, \pi^* 2 p_x^2 \pi^* 2 p_y^2$ Anti bonding electron $=8$ (4 pairs)
BETA
