NEET Chemistry Chemical Equilibrium MCQ Question with Solution

If the equilibrium constant $K_a$ for the ionization of a weak acid HX is $1.0 \times 10^{-5}$ , what is the degree of ionization ( $\alpha$ ) if the initial concentration of HX is 0.1 M?

A

0.01

B

0.003

C

0.001

D

0.0001

Correct Answer

Option A

Detailed Explanation

Using the formula $K_a = \frac{c \alpha^2}{1-\alpha}$ , we can simplify to $K_a \approx c \alpha^2$ for small $\alpha$ . Solving $1.0 \times 10^{-5} = 0.1 \alpha^2$ , we find $\alpha = 0.01$ .

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