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B
Pyrosulphuric acid.
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C
Dithionic acid.
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D
Caro's acid.
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Solution
The correct option is A Caro's acid.
Peroxymonosulfuric acid, also known as persulfuric acid, peroxysulfuric acid, or Caro's acid, is a liquid at room temperature. In this acid, the S(VI) center adopts its characteristic tetrahedral geometry; the connectivity is indicated by the formula HO-O-S(O)2-OH. It is one of the strongest oxidants known and is highly explosive.