Models of Bonding & Structure B.2 The Covalent Model (id: be87fcc57)

本题目来源于试卷: Models of Bonding & Structure B.2 The Covalent Model，类别为 IB化学

[单选题]
The Lewis structure of the nitrite ion is shown.


What is the hybridization of the N atom and the most likely value of the bond angle in the nitrite ion?

A. Hybridization of N is $s{p}^2$;Bond angle $^{\circ}$is125B.HybridizationofNis$sp^2$;Bondangle{\mathrm{\$}}^{\circ }$ is 115
C. Hybridization of N is $s{p}^3$;Bond angle $^{\circ}$is112D.HybridizationofNis$sp^3$;Bondangle{\mathrm{\$}}^{\circ }$ is 107


参考答案:  B


本题详细解析:
The N atom has three electron domains so is $s{p}^2$ hybridized. The $s{p}^2$ orbitals are occupied by two bonding pairs and one non-bonding pair of electrons. The repulsion between the non-bonding and bonding pairs is greater than that between the two bonding pairs, so the bond angle is less than the expected value of 120${}^{\circ }$ ;115${}^{\circ }$ is the most likely of the two options given. 
This question is very hard as the student must correctly identify the hybridization of an unfamiliar molecule, in which one $s{p}^2$ orbital is occupied by non-bonding electrons rather than a bonding pair, and apply VSEPR principles to deduce the likely bond angle.

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