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Question

identify oxidising and reducing agents in equation

H2 + Cl2 gives 2HCl

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Solution

The oxidation number of Hydrogen changes from 0 to +1 in HCl. So Hydrogen is oxidized. So hydrogen is the reducing agent
The oxidation number of Chlorine changes from 0 to -1 in HCl. So Chlorine is reduced. Chlorine is the oxidising agent.

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