Which gas is present in biogas in large percentage? 

The ambient air is stable when the ambient lapse rate is 

The release of which of the following into ponds and wells helps in controlling mosquitoes?

Which one of the following does not form oxyacid? 

Which among the following is used to dilute oxygen in the gas cylinders used by divers? 

The nuclear particle having no mass and no charge, but only spin is 

A liquid disturbed by stirring comes to rest due to 

When Arsenic atoms are added to Germanium Lattice it becomes a/an