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Q. How to change in Oxidation Number in Redox Reactions?
Ans.
In reduction-oxidation, or redox, reactions, atoms undergo changes in their oxidation numbers.
Consider the following reaction:
2Na + Cl2 -> 2Na+ + 2Cl-
In this equation, the oxidation number of sodium increases from 0 to +1 and that of chlorine decreases from 0 to -1. Therefore, we can say that sodium is oxidized and chlorine is reduced.
Consider another reaction:
H2(g) + Cl2(g) -> 2HCl(g)
The reaction of hydrogen with chlorine, like that of sodium with chlorine, is an example of a redox reaction. In this equation, the oxidation number of hydrogen increases from 0 to +1, and that of chlorine decreases from 0 to -1. Hence hydrogen is considered to be oxidized, and chlorine is considered to reduced. Thus, this reaction is also a redox reaction.
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