Question

Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5ppm indicates a water sample to bee__________
A. rich in dissolved oxygen
B. poor in dissolved oxygen.
C. highly polluted.
D. not suitable for aquatic life.

Answer 1

Correct Answer - D
`CuSdarr+H_(2)Orarr"No reaction"`
`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`