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

NTA Abhyas 2020 · Chemistry · Ionic Equilibrium

The ionization constant of a weak monobasic acid is 25 × 1 0 ^ – 6...

The ionization constant of a weak monobasic acid is 25×10–625 \times 1{0}^{– 6} while the equivalent conductance of its 0.01M0.01M solution is 19.6Scm2eq–119.6Scm^{2}eq^{– 1}. The equivalent conductance of the electrolyte at infinite dilution (inScm2eq–1)( inScm^{2}eq^{– 1} ) will be

Options

  1. A250
  2. B196
  3. C392
  4. D384

Correct answer

C. 392

Step-by-step solution

{K}_{a} = {\text{C \alpha}^{2}
25×10–6=(0.01)α225 \times 1{0}^{– 6} = \left(0.01\right){\alpha}^{2}
α=5×10–2\alpha = 5 \times 1{0}^{– 2}
α=ΛeqΛeqo\alpha = \dfrac{{Λ}_{eq}}{{Λ}_{eq}^{o}}
5×10–2=19.6Λeqo5 \times 1{0}^{– 2} = \dfrac{19.6}{{Λ}_{eq}^{o}}
Λeqo=19.65×10–2=392{Λ}_{eq}^{o} = \dfrac{19.6}{5 \times 1{0}^{– 2}} = 392
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