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Select out the pair of the harmless gasesA. CO and `CO_2`B. `SO_2` and `CH_4`C. `N_2` and `O_2`D. `NO_2` and NO

Answer» Correct Answer - C
Smoke stacks of thermal power plants, smelters and other industries release particulate and gaseous air pollutants together with harmless gases such as nitrogen, oxygen, etc.


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