Chemical Bonding and Molecular Structure - Result Question 116
####119. In $NO_3{ }^{-}$ion, number of bond pair and lone pair of electrons on nitrogen atom respectively are
(a) 2,2
(b) 3,1
(c) 1,3
(d) 4,0
[2002]
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Solution:
- (d)
(d) $N: \frac{\uparrow \downarrow}{1 s^{2}} \frac{\uparrow \downarrow}{2 s^{2}}$
To form $NO_3^{-}$, nitrogen uses one $p$-electron for $\pi$-bond formation and two $p$-electrons for $\sigma$-bond formation. $2 s$ electrons are used for coordinate bond formation. Thus there is no lone pair on nitrogen and four bond pairs are present.
