HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumAchiever Section

The correct order of increasing [H₃O⁺] in the following aqueous solution is:

A.0.01 M H₂S < 0.01 M H₂SO₄ < 0.01 M NaCl < 0.01

B.0.01 M NaCl = 0.01 M NaNO₃ < 0.01 M H₂S <✓ Correct

C.0.01 M H₂S < 0.01 M NaNO₃ = 0.01 M NaCl <

D.0.01 M H₂S < 0.01 M NaNO₃ < 0.01 M NaCl< 0.01

Explanation

NaCl → Salt formed by reaction of NaOH and HCl 3 NaNO → Salt formed by reaction of NaOH and 3 HNO Thus, in both cases, we will not expect hydrolysis as both acid and base from which NaCland 3 NaNO are formed are strong and pH is equal to7. Among 2 4 H SO and 2 H S , 2 4 H SO is stronger than 2 H S thus pH of 2 4 H SO < pH of 2 H S . Thus, correct option is 3 2 2 4 0.01 M NaCl 0.01 M NaNO 0.01 M H S 0.01 M H SO

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