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Some chemical equations are given below....

Some chemical equations are given below.
a) `SO_2 + O_2 rarr SO_3`
b) `N_2 + O_2 rarr 2NO`
c) `C + O_2 rarr CO_2`
Balance the unbalanced equations.

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2 SO_2 + O_2 rarr 2SO_3.
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