SATHEE: Chemical Bonding and Molecular Structure

Chemical Bonding and Molecular Structure - Result Question 119

####123. 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

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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} $A n t i b o n d i n g e l e c t r o n$ =8$ (4 pairs)

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Chemical Bonding and Molecular Structure - Result Question 119

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