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JEE Main · 2025 · 02 Apr 2025 · Shift 1 · Solutions

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Which of the following graph correctly represents the plots of at 1 bar gases in water versus temperature?
  1. (A)(see structure)
  2. (B)(see structure)
  3. (C)(see structure)
  4. (D)(see structure)
    ✓ Correct

Answer: (D)

Solution

Henry's constant is the pressure required to dissolve a gas, so it moves opposite to solubility. Warming the water drives dissolved gas out and climbs, but past a certain temperature solvent effects reverse this, so each curve rises to a maximum and then falls. A less soluble gas carries a larger ; since the solubility order is , the constants rank in reverse at every temperature, . The correct plot is the family of curves each passing through a maximum with helium uppermost, nitrogen beneath it and methane lowest.

JEE Main · 2025 · 02 Apr 2025 · Shift 1 · Single correct option

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