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Acidic potassium dichromate (K$_2$Cr$_2$O$_7$/H$_2$SO$_4$) converts ethyl alcohol to acetic acid by making oxygen available. Such a substance that brings about oxidation by supplying oxygen is called a/an:
Aprecipitate
Boxidant
Creductant
Dcatalyst
Answer & Solution
Correct answer: B. oxidant
1. The substance here supplies oxygen to oxidise ethyl alcohol.
2. A substance that brings about oxidation by making oxygen available is an oxidant (oxidising agent).
3. A reductant does the opposite, bringing about reduction.
4. A catalyst is not consumed and supplies no oxygen, and a precipitate is an insoluble solid product, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.51_
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