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

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

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CDS-1 – 2022

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The reaction where a white substance (BaSO4) is formed when barium chloride solution is mixed with sodium sulphate solution is a double displacement reaction (precipitation). In this type of reaction, ions are exchanged between two compounds, but there is typically no change in the oxidation states of the elements involved, meaning it is not an oxidation-reduction (redox) reaction.

Oxidation is a chemical process involving the loss of electrons, gain of oxygen, or loss of hydrogen. Redox reactions involve both oxidation and reduction. Precipitation reactions, where insoluble salts form from the mixing of solutions, are generally non-redox reactions if the oxidation states of the ions remain unchanged.

A) Rancidity of butter is due to oxidation of fats. C) Rusting of iron involves the oxidation of iron. D) Wine turning sour (acetification) is the oxidation of ethanol to acetic acid. These are all examples of oxidation reactions (specifically, redox processes). The reaction BaCl2(aq) + Na2SO4(aq) -> BaSO4(s) + 2NaCl(aq) is a pure double displacement (precipitation) reaction without electron transfer between reacting species.

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