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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Chemistry
Chapter
Ionic Equilibrium

JIPMER 2004 · Chemistry · Ionic Equilibrium

The K a of an acid is 3.2 × 10^ -5 . The degree of dissociation of...

The KaK a of an acid is 3.2×10−53.2 \times 10^{-5}. The degree of dissociation of the acid at concentration of 0.2 M is

Options

  1. A6.0×10−26.0 \times 10^{-2}
  2. B1.26×10−21.26 \times 10^{-2}
  3. C40×10−440 \times 10^{-4}
  4. D0.04×10−30.04 \times 10^{-3}

Correct answer

B. 1.26×10−21.26 \times 10^{-2}

Step-by-step solution

From Ostwald's dilution law α=Kac\alpha=\sqrt{\frac{K a}{c}}=3.2×10−50.2=1.26×10−2\begin{aligned} & =\sqrt{\frac{3.2 \times 10^{-5}}{0.2}} \\ & =1.26 \times 10^{-2}\end{aligned}$$
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