The strongest reducing hydride of group 15 (BiH3)

The same question, asked 3 times: 2021 Paper 5, 2021 Paper 13, 1 Feb 2024. Every wording below, oldest first.

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Question 1
2021 Paper 5
50 $A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is:$
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Question 2
2021 Paper 13
34 $Which of the following is most reducing agent in group 15 elements?$
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Question 3
1 Feb 2024
126 $The strongest reducing agent among the following is:$
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