Write the general electronic configuration of 3d series. Draw the structures of sulphuric acid and thiosulphuric acid.
Q.15 Write the general electronic configuration of 3d series. Draw the structures of sulphuric acid and thiosulphuric acid.
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Answer: [Ar] 3d1–10 4s1–2; structures described below.
General electronic configuration of the 3d series: [Ar] 3d1–10 4s1–2 (from Sc, [Ar]3d14s2, to Zn, [Ar]3d104s2).
Sulphuric acid, H2SO4: tetrahedral S atom bonded to two =O atoms and two −OH groups: (HO)2S(=O)2, i.e. HO−S(=O)(=O)−OH.
Thiosulphuric acid, H2S2O3: tetrahedral central S atom bonded to one =S, one =O and two −OH groups: HO−S(=O)(=S)−OH.
[In the exam, draw both as tetrahedral structures around the central sulphur, with the double bonds and OH groups labelled.]
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· 28 Oct 2026
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