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  9. Q212

RRB Group D (Level-1 posts) 2025 · Question 212 of 386

Which of the following statements best explains why dry HCl gas does NOT change the colour of dry litmus paper, but aqueous HCl does?

  1. AWater reacts with litmus, not HCl.
  2. BLitmus paper only works in the presence of light.
  3. CHCl only releases H ⁺ ions when dissolved in water.Correct
  4. DDry HCl gas is non-acidic.

Answer: C. HCl only releases H ⁺ ions when dissolved in water.

Official answer key verified. Detailed explanation coming soon.

Source: RRB Group D 2024 Question Paper PDF (Dec 27, 2025) (Shift 1) · official-answer-key

← Q211View full paper (386 questions)Q213 →

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