Permanent hard water may be softened by passing it through
sodium silicate
sodium bicarbonate
sodium hexametaphosphate
sodium phosphate
Correct answer is C
No explanation has been provided for this answer.
The chemical oxygen demand (COD) measures the
amount of oxygen required for growth of microorganisms in water
amount of oxygen that would be removed from the water in order to oxidize pollution
amount of oxygen required to oxidize the calcium present in waste water
none of the above
Correct answer is B
No explanation has been provided for this answer.
Conventional tertiary treatment is
chemical coagulation and flocculation
filtration
sedimentation
none of these
Correct answer is A
No explanation has been provided for this answer.
Zeolite softening process removes
only temporary hardness of water
only permanent hardness of water
both temporary and permanent hardness of water
the dissolved gases in permanent hard water
Correct answer is C
No explanation has been provided for this answer.
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