1. The skeleton eqn. with oxidation no. is :
+2 -1 0 +3 -2 +4 -2
FeS2 + O2 ? Fe2O3 + SO2
NOTE : The oxidation no. of sulphur in FeS2 -1 and not -2
2. The oxidation no. of Fe as well as S increases from +2 to +3 and -1 to +4 resp. Since Fe and S must maintain their atomic ratio, the change in oxidation no. will be considered together. On the other hand, the oxidation no. of oxygen decreases from 0 to -2. Thus,
3. To balance increase and decrease of oxidation no., multiply FeS2 by 4 and O2 by 11.
4FeS2 + 11O2 ? Fe2O3 + SO2
4. Balancing all atoms
4FeS2 + 11O2 ? 2Fe2O3 + 8SO2
Hope you?ll find it easy now!!!!!!
Moderation Team
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0
Fe2O3 + SO2
