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Question

The following reaction occurs in acidic aqueous solution:
H3AsO4+ZnAsH3+Zn2+
H3AsO4 is a ______ agent in which the oxidation number of As is _______ .

A
Reducing, +5
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B
Oxidizing, +5
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C
Reducing, +3
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D
Oxidizing, +3
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Solution

The correct option is B Oxidizing, +5
H3AsO4+ZnAsH3+Zn2+
Here, Zn is oxidized to Zn2+.
So, H3AsO4 is reduced and acts as an oxidising agent.
In H3AsO4
3+x8 = 0x = +5

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