pH of a weak monobasic acid from its percent dissociation and concentration

The same question, asked 2 times: 16 May 2023 S2*, 13 Apr 2026 S1. Every wording below, oldest first.

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Question 1
16 May 2023 S2
59 $Calculate the pH of 0.02 M monobasic acid having 2% dissociation.$
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Question 2
13 Apr 2026 S1
9 $A weak monobasic acid is 0.04 % dissociated in 0.25 M solution. What is pH of the solution?$
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