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JEE Main 2023 · 25 Jan · Shift 1

JEE Main 2023 Chemistry question on Solutions

'25 volume' hydrogen peroxide means
  1. A.
    1 L marketed solution contains 75 g of H2O2\text{H}_2\text{O}_2.
  2. B.
    100 mL marketed solution contains 25 g of H2O2\text{H}_2\text{O}_2.
  3. C.
    1 L marketed solution contains 250 g of H2O2\text{H}_2\text{O}_2.
  4. D.
    1 L marketed solution contains 25 g of H2O2\text{H}_2\text{O}_2.
Show answer and solution

Correct option: A

Solution

"25 volume" H₂O₂ means 1 L of the solution releases 25 L of O₂ at STP upon decomposition: 2H₂O₂ → 2H₂O + O₂. Using moles: 25 L O₂ at STP = 25/22.4 mol O₂, requiring 2× that in H₂O₂ = 50/22.4 mol H₂O₂. Mass = (50/22.4) × 34 ≈ 75.9 g ≈ 75 g of H₂O₂ per litre of solution. Hence option 1 is correct.

[JEE Main 2023 · 25 Jan · Shift 1]

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