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JEE Main202621 January 2026Morning ShiftChemistrySome Basic Concepts of ChemistryActual

14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K. Which of the following statements is incorrect? [Given : Molar mass in g mol ⁻¹ of Ca -40, Cl -35.5, H -1 ]

Options

  1. A0.35 mol of H ₂ gas is evolved.
  2. B7.84 L of H ₂ gas is evolved.
  3. CThe limiting reagent is calcium metal.
  4. D33.3 g of CaCl ₂ is produced.

Correct answer

D. 33.3 g of CaCl ₂ is produced.

Step-by-step solution

Reaction: Ca + 2HCl CaCl₂ + H₂ Moles of Ca = 14.0 40 = 0.35 mol. Since HCl is in excess, Ca is limiting. Option (1): H₂ evolved = 0.35 mol Option (2): Volume of H₂ at STP = 0.35 22.4 = 7.84 L Option (3): Ca is limiting reagent Option (4): Mass of CaCl₂ = 0.35 111 = 38.85 g, not 33.3 g Statement (4) is incorrect.

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