Select out the pair of the harmless gases

Select out the incorrect pair

Select correct matched pair / pairs

Particulate and gaseous pollutants along with harmless gases are released form the thermal power plants. Name any two harmless gases released.

Pick out the pair of gases with the same rate of diffusion

Select the mismatched pair out of the following

Select the mismatched pair out of the following

Select the mismatched pair out of the following

Select the mismatched pair out of the following

Select the mismatched pair out of the following