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MHT CET202519 Apr 2025Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Identify the correct molecular formula of 'Oleum' from following.

Options

  1. AH ₂ ~S ₂ O ₃
  2. BH ₂ ~S ₂ O ₅
  3. CH ₂ ~S ₂ O ₇
  4. DH ₂ ~S ₂ O ₈

Correct answer

C. H ₂ ~S ₂ O ₇

Step-by-step solution

Oleum , also known as fuming sulfuric acid, is formed by dissolving sulfur trioxide in concentrated sulfuric acid. The reaction is H₂ SO₄ + SO₃ H₂ S₂ O₇ . Among the options: H₂ S₂ O₃ is thiosulfurous acid H₂ S₂ O₅ is disulfurous acid H₂ S₂ O₇ is disulfuric acid (Oleum) H₂ S₂ O₈ is peroxodisulfuric acid The correct molecular formula is H₂ S₂ O₇ , corresponding to option C.

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