Water Treatment

Permanent hard water may be softened by passing it through

A:

sodium silicate

B:

sodium bicarbonate

C:

sodium hexametaphosphate

D:

sodium phosphate

Answer: C

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Hardness of water does not

A:

have any bad effect in boiler

B:

make cooking of foods difficult

C:

make it unfit for drinking

D:

cause difficulty in the washing of clothes with soaps

Answer: C

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The chemical oxygen demand (COD)measures the

A:

amount of oxygen required for growth of microorganisms in water

B:

amount of oxygen that would be removed from the water in order to oxidize pollution

C:

amount of oxygen required to oxidize the calcium present in waste water

D:

none of the above

Answer: B

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The maximum desirable limit (BIS) of total hardness (as CaCo₃) in drinking water is

A:

600 ppm

B:

300 ppm

C:

500 ppm

D:

1000 ppm

Answer: B

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Conventional tertiary treatment is

A:

chemical coagulation and flocculation

B:

filtration

C:

sedimentation

D:

none of these

Answer: A

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Questions for: Water Treatment