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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

The values of dissociation constant of some bases are given below. Which is the weakest base?

Options

  1. A1.8 × 10 - 5
  2. B4.8 × 10 - 10
  3. C7.2 × 10 - 11
  4. D7.07 × 10 - 7

Correct answer

C. 7.2 × 10 - 11

Step-by-step solution

For base B O H B O H ⇌ B + + O H - Dissociation constant K b = B + O H - [ B O H ] ∴ Higher the value of K b , more will be dissociation of base and stronger will be base and vice-versa. ∴ Weakest base among given choices is having K b = 7.2 × 10 - 11 .

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