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Chemical Bonding and Molecular Structure

Multiple Choice Questions

341.

A coordiante bond is a dative covalent bond. Which of the below is true?

Three atom form bond by sharing their electrons
Two atom form bond by sharing their electrons
Two atoms form bond and one of them provides both electrons
Two atoms form bond by sharing electrons obtained from third atom

342.
The number of antibonding electron pairs in $O_{2}^{2 -}$ molecular ion on the basis of molecular orbital theory is

2

3

4

5

$O_{2}^{2 -}$ according to molecular orbital theory and count number of electron pairs in antibonding molecular orbitals.

$O_{2}^{2 -} = 8 + 8 + 2 = 18 = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, \overset{*}{π} 2 p_{x}^{2}, \overset{*}{π} 2 p_{y}^{2} Antibonding electron pairs are \overset{*}{σ} 1 s^{2}, \overset{*}{σ} 2 s^{2}, \overset{*}{π} 2 p_{x}^{2}, \overset{*}{π} 2 p_{y}^{2} ∴ Total 4 antibonding electron pairs are there$