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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Ionic Equilibrium

NTA Abhyas 2020 · Chemistry · Ionic Equilibrium

For two weak acids A and B, the ratio of their percent ionization...

For two weak acids A and B, the ratio of their percent ionization is 4:9. The ratio of their K_{a}& would be-

Options

  1. A4:9
  2. B2:3
  3. C16:81
  4. D3:2

Correct answer

C. 16:81

Step-by-step solution

Ka∝cα2{K}_{a} ∝ \text{c}{α}^{2}

∴Ka1Ka2=α12α22∴ \dfrac{{K}_{{a}_{1}}}{{K}_{{a}_{2}}} = \dfrac{{α}_{1}^{2}}{{α}_{2}^{2}}

=4292=1681= \dfrac{{4}^{2}}{{9}^{2}} = \dfrac{16}{81}
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