Which one of the following is not an example of an oxidation reaction ?

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Q: 8 (CDS-I/2022)

Which one of the following is not an example of an oxidation reaction ?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,125,134,30,125,52,52

keywords: 

{'oxidation reaction': [0, 0, 0, 1], 'barium chloride': [0, 0, 1, 1], 'sodium sulphate solution': [0, 0, 0, 1], 'aqueous solution': [0, 0, 4, 2], 'white substance': [0, 0, 0, 1], 'brown powder': [0, 0, 0, 1], 'butter changes': [0, 0, 0, 1], 'iron': [0, 0, 1, 1], 'wine': [1, 0, 0, 2], 'taste': [2, 0, 0, 3]}

Option 1: The taste of butter changing over time is an example of oxidation. When unsaturated fats in butter are exposed to oxygen, they undergo oxidation, leading to a change in taste.

Option 2: This is the correct answer. Mixing barium chloride with sodium sulphate solution results in a precipitation reaction, not an oxidation reaction. No oxygen is involved in this reaction.

Option 3: The reddish-brown powder coating on iron articles is rust, which occurs due to the oxidation of iron in the presence of oxygen and moisture.

Option 4: Wine getting sour over time is also an example of oxidation. The acetic acid-producing bacteria oxidize the ethanol in wine to acetic acid, resulting in a sour taste.

Therefore, option 2 is not an example of an oxidation reaction, while the other options involve oxidation.

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