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Question: Answered & Verified by Expert
Among the following, the correct formula of Marshall's acid is
Chemistryp Block Elements (Group 15, 16, 17 & 18)JIPMERJIPMER 2018
Options:
  • A $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_6$
  • B $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$
  • C $\mathrm{H}_2 \mathrm{SO}_4$
  • D $\mathrm{H}_2 \mathrm{SO}_5$
Solution:
2263 Upvotes Verified Answer
The correct answer is: $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$
The correct formula of Marshall's acid is $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$. It is known as peroxodisulphuric acid having sulphur ( S ) in +6 oxidation state. The structure of this acid is shown below:

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