Pyrosulphuric acid, $H X_{2} S X_{2} O X_{7}$ , is drawn with two S=O bonds on each S atom, two S-OH groups and one S-O-S bridge. The total number of sigma bonds in one molecule is

Answer: D

Each S is bonded to four O atoms: S-O sigma bonds total 4 + 4 = 8, counting the bridging oxygen twice (once for each S). Add 2 O-H bonds: 8 + 2 = 10 sigma bonds. The extra bonds in S=O are pi bonds.

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Pyrosulphuric acid, HX2​SX2​OX7​, is drawn with two S=O bonds on each S atom, two S-OH groups and one S-O-S bridge. The total number of sigma bonds in one molecule is

Answer: D

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Pyrosulphuric acid, $H X_{2} S X_{2} O X_{7}$ , is drawn with two S=O bonds on each S atom, two S-OH groups and one S-O-S bridge. The total number of sigma bonds in one molecule is