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.
Frequently asked questions
What is the correct answer to this question?
A is reduced and B is oxidised
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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