BOD value less than 5 ppm indicates a wa...

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

rich in dissolved oxygen

poor in dissolved oxygen

highly polluted

not suitable for aquatic life

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High BOD indicates

Read the following statements and select the correct option. Statement 1 : BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms. Statement 2 : High value of BOD indicates that water is highly polluted by organic matter.

The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb,40 ppb,100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of

A water sample has ppm level concentration of the following metals : Fe=0.2,Mn=5.0,Cu=3.0,Zn=5.0. The metal that makes the water sample unsuitable for drinking is :

The concentration of Ca (HCO_(3))_(2) in a sample of hard water is 405 ppm. The denstiy of water sample is 1.0 gm/ml. Calculate the molarity of solution ?

100 mL sample of hard water is titrated with 500 " mL of " 0.001 M EDTA solution at pH=10 , using eriochrome black-T indicator to reach equivalence point. An equal another amount of hard water sample is boiled for 30 min. After filtration and cooling, the same sample is titrated with 200 " mL of " 0.011 M EDTA solution at pH=10 using Mg-EDTA complex solution and erichrome black-T indicator to reach equivalence point. (i). Calculate the total hardness of water sample (temporary + permanent) in ppm of CaCO_3 .

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 .

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

A water body has high BOD indicating that water is

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