Q7 / 150 · MHT CET 2022 (08 Aug Shift 1) · Chemistry

The percent dissociation of weak monobasic acid is $3 \%$ in its $0.02 \mathrm{M}$ solution. What is the dissociation constant of acid?

  • A
    $9 \times 10^{-4}$
  • B
    $3 \times 10^{-2}$
  • C
    $2 \times 10^{-2}$
  • Correct answer
    D
    $1.8 \times 10^{-5}$

Solution

$\begin{aligned} & K_a=\propto^2 C \\ & =\left(\frac{3}{100}\right)^2 \times 0.02 \\ & =1.8 \times 10^{-5}\end{aligned}$

Hence, the correct answer is option: 'D'.

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