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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn107

Select the correct statement(s) about peroxomonosulphuric acid, (Caro's acid).

  1. AThe oxidation state of sulphur is +6
  2. BIt contains one O-O linkage
  3. CIt can be obtained by partial hydrolysis of peroxodisulphuric acid
  4. DIt contains an S-S bond

Answer: A, B, C

In S carries four oxygens normally bonded (one is in the -OOH group, the O-O unit being peroxo with -1 each), so S is in the +6 state: gives . gives Caro's acid by partial hydrolysis. It has no S-S bond, so D is wrong.
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