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MHT CET202526 Apr 2025Morning ShiftChemistryIonic EquilibriumActual

Which among the following salt turns blue litmus red in its aqueous solution?

Options

  1. ACuSO ₄
  2. BNa ₂ CO ₃
  3. CNa ₂ SO ₄
  4. DNaNO ₃

Correct answer

A. CuSO ₄

Step-by-step solution

Identification of acidic salt The salt that turns blue litmus red must yield an acidic aqueous solution through hydrolysis of its constituent ions. Copper(II) sulfate ( CuSO4 ) dissociates into Cu²⁺ and SO₄²⁻ ions. The Cu²⁺ cation, being the conjugate acid of weak base Cu(OH)₂ , hydrolyzes: Cu²⁺ + 2H₂ O Cu(OH)₂ + 2H+ This reaction produces hydrogen ions, acidifying the solution. Sodium carbonate ( Na₂CO₃ ) yields basic solution due to CO₃²⁻ hydrolysis: CO₃²⁻ + H₂ O HCO₃- + OH- . Sodium sulfate ( Na₂SO₄ ) and sodium

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