The sum of oxygen atoms in the formulae of peroxysulphuric acid and pyrosulphuric acid is

The sum of oxygen atoms in the formulae of peroxysulphuric acid and pyrosulphuric acid is
  1. 7
  2. 12
  3. 15
  4. 13

Solution

Peroxysulphuric acid (Peroxydisulphuric acid) $ =\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8 \text {. } $ Pyrosulphuric acid $=\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$ $\Rightarrow$ Sum of $\mathrm{O}$-atoms $=8+7=15$

Asked in: AP EAMCET 2023 (19 May Shift 1)

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