The value of BOD of highly polluted water is
(1) more than 17 ppm
(2) in between 5 to 10 ppm
(3 ) 1 ppm
(4) 5ppm

What is meant by 5 ppm CaCO_(3) solution?

B.O.D values of four samples of water A,B,C and D are given below A 160 ppm B 35 ppm C 180 ppm D 25 ppm

If BOD value of water is 20 ppm then what can we conclude regarding water ?

Assertion : The amount of BOD in the water is a measure of the amount of organic material in the water . Reason : Clear water has BOD less than 5 ppm whereas highly polluted water can have BOD value of 17 ppm or more .

A sample of hard water contains 1 mg CaCl_2 and 1 mg MgCl_2 per litre. Calculate the hardness of water in terms of CaCO_3 present in per 10^(6) parts of water. (a). 2.5 ppm (b). 1.95 ppm (c). 2.15 ppm (d). 195 ppm

Assertion : BOD of river polluted by sewage is more than 20 ppm. Reason: Polluted river contains excess of organic matter.

The presence of SO_(3) to an extent of 1 ppm in air is

If water contains 10 ppm of MgCl_2 and 8 ppm of CaSO_4 , calculate the ppm of CaCO_3 .

BOD value less than 5 ppm indicates a water sample to be

A concentration of 1 ppm means that