UPSC CDS 1 2022 GK Paper

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Question : 8 of 120

Marks: +1, -0

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

The taste of butter changes if left for a longer period
A white substance is formed when an aqueous solution of barium chloride is mixed with sodium sulphate solution
A reddish-brown powder gets coated on articles made of iron
Wine gets sour with time

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