The redox reaction equation for this reaction is; 2HNO3 + H2S → 2NO + SO2 + 2H2O.
A redox reaction equation is one in which there is an increase/decrease in the oxidation number of the reacting species. Some species experience an increase in oxidation number(oxidation) while some species experience a decrease in oxidation number(reduction).
The redox reaction equation for this reaction is; 2HNO3 + H2S → 2NO + SO2 + 2H2O. We can see that the oxidation number of nitrogen reduced from +5 to +2 while oxidation number of sulfur increased from -2 to +4.
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