When H3AsO3 reacts with BrO3- to give Br-, what happens to arsenic?
AOxidation number falls from +5 to +3
BOxidation number rises from +3 to +5
COxidation number rises from +1 to +5
DOxidation number stays at +3
Answer & Solution
Correct answer: B. Oxidation number rises from +3 to +5
Arsenic goes from +3 in H3AsO3 to +5, so it is oxidised and acts as the reducing agent.
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