The number of species from the following that have pyramidal geometry around the central atom is

Question

Canvas Classes · Accepted Answer

Pyramidal geometry requires 3 bonds + 1 lone pair on central atom.

Step 1 — Analyse each species:

(thiosulfate): Central S bonded to 3 O and 1 S (terminal); S has 4 bonds → tetrahedral, not pyramidal ✗

(sulfate): S has 4 bonds + 0 lone pairs → tetrahedral ✗

(sulfite): S has 3 bonds + 1 lone pair → pyramidal ✓

(pyrosulfate): Two SO₃ units bridged by O; each S has 4 bonds → tetrahedral ✗

Step 2: Only  has pyramidal geometry → 1 species

Answer: Option (4) — 1

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