The BOD values of water indicate the
A). Amount of organic debris
B). Amount of oxygen used for biochemical reduction
C). Amount of oxygen used for biochemical reduction
D). Amount of ozone used for biochemical oxidation
Amount of oxygen used for biochemical oxidation
Clean water has BOD which is less than 5 ppm. If it is equal to or more than 12 ppm, then the water is considered as polluted. So this indicates water be rich in dissolved oxygen, that helps the microorganisms to oxidize inorganic and organic materials.
2. Which among the following is pure matter
3. Question 5.23:Explain the physical significance of Van der Waals parameters.
4. The substance which does not expand on going from liquid state to solid state is
5. One of the constituents of tear gas is
6. Which of the following elements is obtained from seaweeds ?
7. The compounds formed when hydrogen combines with p-block elements are called
8. The metal chiefly used for galvanising iron is :
9. Which one of the following metals pollutes the air of a city having large number of automobiles?
10. When cone H2S04 is added to dry KNO3 brown fumes are evolved. These fumes are due to