Q3 · CSIR-NET Chemistry, December 2012
Paper: CSIR-NET December 2012 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Chemical Bonding – General · Marks: 2 · Difficulty: Easy
Which ones among $\mathrm{CO}_{3}^{2-}, \mathrm{SO}_{3}, \mathrm{XeO}_{3}$, and $\mathrm{NO}_{3}^{-}$, have planar structure?
(a)$\mathrm{CO_3^{2-}}$, $\mathrm{SO_3}$, and $\mathrm{XeO_3}$
(b)$\mathrm{SO}_{3}, \mathrm{XeO}_{3}$, and $\mathrm{NO}_{3}{ }^{-}$
(c)$\mathrm{CO_3^{2-}}$, $\mathrm{XeO_3}$, and $\mathrm{NO_3^{-}}$
(d)$\mathrm{CO}_{3}^{2-}, \mathrm{SO}_{3}$, and $\mathrm{NO}_{3}^{-}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
CO₃²⁻, SO₃ and NO₃⁻ are trigonal planar (no lone pair on the centre); XeO₃ has a lone pair and is pyramidal (d).
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