Q. Water is made disinfectant during purification of water in the step

View solution

Q. The waste products are given out from chimneys, automobiles produce pollution

View solution

Q. The elevated concentration of metals causes clogs of gills in fish

View solution

Q. Reducing smog contains

View solution

Q. The residence time of NO and NO₂ in atmosphere are respectively in days

View solution

Q. Acidification of soil can leach metals

View solution

Q. Paddy fields produce significant amount of gas

View solution

Q. Mean residence time of methane in atmosphere in years is

View solution

Q. 1-9 % of sulphur is present in

View solution

Q. Eample of more toxic element is

View solution

Q. PAN, Ozone, sulphuric acid, peroxybenzol, aldehydes and ketones are called

View solution

Q. Poisoning of CO can be reversed by giving oxygen at pressure

View solution

Q. In water, most oxidizing agent is dissolved O₂ in the concentration ranges from

View solution

Q. The gas essential for life is

View solution

Q. SO₂ in atmosphere is converted into

View solution

Q. Underground or surface water is treated because it is

View solution

Q. A hole used to dump the municipal wastes is called

View solution

Q. Components of environment necessary for sustaining life are

View solution

Q. The drops of rain fall down due to density than air

View solution

Q. These have maximum density

View solution