Which of the following statements is correct regarding redox reactions?

An increase in oxidation number of an element is called reduction .

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A decrease in oxidation number of an element is called oxidation.

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A reagent which lowers the oxidation number of an element in a given substance is reductant.

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A reagent which increase the oxidation number of an element in a given substance is reductant.

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Solution

The correct option is C A reagent which lowers the oxidation number of an element in a given substance is reductant.
A. An increase in oxidation number is due to loss of an electron and is called oxidation.
B. A decrease in oxidation number is due to gain of electron and is called reduction.
C. A reagent which lowers the oxidation number of an element in a given substance is the reducing agent or reductant.
D. A reagent which increase the oxidation number of an element in a given substance is the oxidising agent or oxidant.

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