Environmental C...

Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.

Which of the following statements is wrong?

Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of:

Which of the following statements about photochemical smog is wrong?

The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is _________.

Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because _________.

The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

Which of the following statements is correct?

Which of the following practices will not come under green chemistry?

Carboxyhaemoglobin causes following things if present in human blood :