DOWNLOAD HSEB NOTES ON ELECTROCHEMICAL REACTION | CHEMISTRY
CLASS : 12
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Redox Reagents
In the reaction 15.1 above, the magnesium is being oxidized by the chlorine, and the chlorine is being reduced by the magnesium. The magnesium undergoes and the chlorine undergoes reduction. Therefore Chlorine is the Oxidizing agent! An oxidizing agent causes the other species with which it is reacting to be oxidized. In this process, the oxidizing agent accepts electrons and thus becomes reduced.
Magnesium is the Reducing agent! A Reducing agent causes the other species with which it is reacting to be reduced. In this process, the reducing agent donates electrons and thus becomes oxidized. To summarise, magnesium is a reducing agent and in the reaction, it is oxidized because it donates its electrons and increases its oxidation number (it becomes more positive). Chlorine is an oxidizing agent and in the reaction, it is reduced because it accepts electrons and decreases its oxidation number (it becomes more negative).Balancing Redox reactions
The reaction of species involves the transfer of electrons and involves numerous steps and perhaps more than two atoms. The ion-electron method can be used successfully to balance multi-atomic redox reactions involving numerous electron transfers.
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