Assertion : Water with BOD value 17 is considered polluted
Reason : The amount of oxygen required by the bacteria to break down the inorganic and organic matter in certain volume of water

The amount of oxygen required to oxidize organic substance present in water is called

The amount of oxygen that would be consumed if all organic matter in one liter of water oxidised by bacteria is called ?

A: Value of COD is greater than BOD. R: Used oxygen is demanded by some chemicals for oxidation of inorganic and organic pollutants.

The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called BIOCHEMICAL OXYGEN DEMAND (BOD). Which of the following statements are correct ?

Assertion (A) : The lower the concentration of DO , the the more polluted is the water sample. Reason (R) : Oxygen is consumed by microbes for the decomposition of organic matter present in water.

Assertion : Decomposers keep the environment clean. Reason: They recycle matter by breaking down the organic remains and waste products of plants and animals.

Assertion (A): Decomposers keep the environment clean. Reason (R): They recycle matter by breaking down the organic remains and waste products of plants and animals.

Assertion: The greater the BOD of waste water, less is its polluting potential. Reason: The effuent from the primary treatment plant is generally released into natural water bodies like rivers and streams.

Nine volumes of a gaseous mixture consisting of gaseous organic compound A and just sufficient amount of oxygen required for compelete combusition yilded on burning four volumes C_2 . Six volumes of water vapour, and two volumes of N_2 , all volumes measured at the same temperature and pressure. If the compound contains C, H and N only, the molecular formula of the compound A is: