Which hydride of group 16 (H2O to H2Te) is the most acidic

The same question, asked 2 times: 9 May 2024 S1, 11 Apr 2026 S2. Every wording below, oldest first.

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Question 1
9 May 2024 S1
57 $Which from following molecules exhibits highest acidic nature?$
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Question 2
11 Apr 2026 S2
3 $Which of the following compounds is most acidic in nature?$
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