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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

The pH of 0.5 M aqueous solution of H F K a = 2 × 1 0 - 4 is

Options

  1. A2
  2. B4
  3. C6
  4. D10

Correct answer

A. 2

Step-by-step solution

K a = C α 2 2 × 10 4 = 0.5 × α 2 α = 2 × 10 - 2 ∴ H + = C α = 0.5 × 2 × 10 - 2 = 10 - 2 p H = 2

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