A catalyst used in the preparation of oxygen from H₂O₂ is

The acid rain does  not occur by

Automobiles can reduce the carbon monoxide and other pollutant by the installation of

The process of coating  an iron with zinc is called

Baking powder is

Drt Ice is

Increased concentration of Co₂ in atmosphere is responsible for

Which is used to burn the fuel in space rockets and missile?

Which air pollutant is not released by the automobiles?.

The smog is essentially cared by the presence of