how can we balance it.....

FeS2 + O2-------> Fe2O3 + SO2

by both oxidation number method and ion-electron method......

This equation can be balanced directly as..

 

The following links explains how to balance the equation using both methods..

https://www.meritnation.com/ask-answer/question/balancing-the-chemical-eqution-please-give-me-a-one-examples/some-basic-concepts-of-chemistry/1070475 

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