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MHT CET202618 April 2026Evening ShiftChemistryIonic EquilibriumActual

Which of the following aqueous salt solutions has the least pH value ?

Options

  1. ANa ₂ CO ₃
  2. BCuCl ₂
  3. CCH ₃ COONa
  4. DNaNO ₃

Correct answer

B. CuCl ₂

Step-by-step solution

Na ₂ CO ₃ is a salt of a strong base ( NaOH ) and a weak acid ( H ₂ CO ₃ ), so its aqueous solution is basic with pH > 7 . CuCl ₂ is a salt of a weak base ( Cu(OH) ₂ ) and a strong acid ( HCl ), so its aqueous solution undergoes cationic hydrolysis to give an acidic solution with pH CH ₃ COONa is a salt of a strong base ( NaOH ) and a weak acid ( CH ₃ COOH ), so its aqueous solution is basic with pH > 7 . NaNO ₃ is a salt of a strong base ( NaOH ) and a strong acid ( HNO ₃ ), so its aqueous solution is neutral with

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