Which one of the following is not an oxidation reaction?

Which one of the following is not an oxidation reaction?

[amp_mcq option1=”Rusting of iron” option2=”Opening of soda bottle” option3=”Rancidity” option4=”Combustion” correct=”option2″]

This question was previously asked in

UPSC CDS-1 – 2023

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The correct answer is B) Opening of soda bottle. This is a physical process involving the release of dissolved carbon dioxide gas due to reduced pressure upon opening the bottle. It does not involve a chemical reaction where a substance loses electrons or gains oxygen (oxidation).

– Oxidation is a chemical process involving the loss of electrons or an increase in oxidation state by a molecule, atom, or ion. It often involves reaction with oxygen.
– Rusting of iron is the oxidation of iron in the presence of oxygen and moisture to form iron oxides (rust).
– Rancidity is the oxidation or hydrolysis of fats and oils, leading to unpleasant smells and flavors.
– Combustion is a chemical process (often rapid) between a substance and an oxidant, usually oxygen, to produce heat and light. It is typically an oxidation-reduction (redox) reaction.

While opening a soda bottle involves a release of energy (due to decreasing potential energy of the compressed gas), the fundamental process is a physical change of state and solubility due to pressure change, not a chemical oxidation reaction like rusting, rancidity, or combustion.

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