Paper: CSIR-NET June 2011 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: MO Theory Diatomics · Marks: 2 · Difficulty: Medium
Among $\mathrm{SF_4^{-}}$, $\mathrm{BF_4^{-}}$, $\mathrm{XeF_4}$, and $\mathrm{ICl_4^{-}}$, the number of species having two lone pair of electrons central atom according to VSEPR theory is:
(a)2
(b)3
(c)4
(d)0
Answer
Answer: A ✓ checked by 4AB · confidence high
The source book printed B; on checking, A is correct — see the explanation.
Printed B; only XeF4 and ICl4- carry two lone pairs.
Explanation
Lone pairs on the central atom: SF₄ 1, BF₄⁻ 0, XeF₄ 2, ICl₄⁻ 2 — two species with two lone pairs.