The following reaction occurs in acidic aqueous solution: H3AsO4+Zn→AsH3+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 BOxidizing,+5 H3AsO4+Zn→AsH3+Zn2+ Here, Zn is oxidized to Zn2+. So, H3AsO4 is reduced and acts as an oxidising agent. In H3AsO4 3+x−8=0⇒x=+5