PDF chapter test TRY NOW

Fill in the blanks with the options given in the box below:
 
ArsenicLeadSulphur oxide
OxygenNickelPhotosynthesis
OzoneIncreaseMethyl isocyanate
Nitrogen oxideAbsenceConvention currents
WaterCellularAir pollution
Sulphur oxideConvention currentsNickel
 
1. ________ is the air pollutant that are released during the process of electricity generation.
 
2. In _______ of air combustion process ceases.