# Oxidation Number Change Method

Oxidation Number Change Method:

Following steps are followed while balancing redox equation by this method:

(i) Select the atom in oxidising agent whose oxidation number decreases and write the gain of electrons.

(ii) Select the atom in reducing agent whose oxidation number increases and write the loss of electrons.

(iii) Now cross multiply, i. e. , multiply oxidising agent by no. of loss of electrons and reducing agent by no. of gain of electrons.

(iv) Balance the number of atom on both sides whose oxidation number change in the reaction.

(v)  In order to balance oxygen atoms add $H_2O$ molecules on right hand side, then balance number of H atoms by adding $^+$ion on other side.

(vi) If reaction takes place in alkaline medium, add $OH^-$ ions on both sides equal to $H^+$ ions.

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