Question:
The number of species below that have two lone pairs of electrons in their central atom is _________. (Round off to the Nearest Integer). SF₄, BF₄⁻, ClF₃, AsF₃, PCl₅, BrF₅, XeF₄, SF₆
The number of species below that have two lone pairs of electrons in their central atom is _________. (Round off to the Nearest Integer). SF₄, BF₄⁻, ClF₃, AsF₃, PCl₅, BrF₅, XeF₄, SF₆
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XeF₄ has 2 lone pairs but its shape is Square Planar because the lone pairs occupy opposite axial positions to minimize repulsion.
Updated On: Feb 3, 2026
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Correct Answer: 2
Solution and Explanation
Step 1: Determine lone pairs (LP) using $LP = \frac{1}{2}(\text{Valence } e^- - \text{Bonded } e^- - \text{Charge})$.
SF₄: 1 LP
BF₄⁻: 0 LP
ClF₃: 2 LP (Correct)
AsF₃: 1 LP
PCl₅: 0 LP
BrF₅: 1 LP
XeF₄: 2 LP (Correct)
SF₆: 0 LP
Total species with 2 lone pairs = 2 ($ClF_3$ and $XeF_4$).
SF₄: 1 LP
BF₄⁻: 0 LP
ClF₃: 2 LP (Correct)
AsF₃: 1 LP
PCl₅: 0 LP
BrF₅: 1 LP
XeF₄: 2 LP (Correct)
SF₆: 0 LP
Total species with 2 lone pairs = 2 ($ClF_3$ and $XeF_4$).
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