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  1. Number of molecules in one litre of water is close to
  2. Acidity of diprotic acids in aqueous solutions increases in the order
  3. In a buffer solution containing equal concentration of B⁻ and HB,
  4. The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is
  5. 5 mL of N HCl, 20 mL of N/2 H₂SO₄ and 30 mL of N/3 HNO₃ are mixed together