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If substance A loses oxygen and substance B gains that oxygen, what is the correct sequence of changes in substances A and B?

Answer and explanation

Correct answer: A is reduced and B is oxidised

In the oxygen-based definitions of redox, loss of oxygen is reduction and gain of oxygen is oxidation. Therefore, substance A, which loses oxygen, is reduced, while substance B, which gains oxygen, is oxidised. Hence option B is correct. Option A reverses the definitions, and options C and D incorrectly assign the same process to both substances.

Related tags

ScienceClass 10Chemical ReactionsOxidationReductionRedox ReactionsChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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