1.

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

Answer»

rich in DISSOLVED oxygen
poor in dissolved oxygen.
highly polluted.
not suitable for AQUATIC life.

Solution :`CuSdarr+H_(2)Orarr"Noreaction"`
`Fe_(2)S_(3)+H_(2)OrarrFe^(2+)(AQ)+Sdarr`
`Cr_(2)S_(3)+H_(2)OrarrCr(OH)_(3)darr+H_(2)Suarr`
`MgS+H_(2)OrarrMg(OH)_(2)darr+H_(2)Suarr`


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