Water Treatment

Permanent hardness of water is caused by the presence of

A:

bicarbonates of calcium and magnesium

B:

carbonates of sodium and potassium

C:

chlorides and sulfates of calcium and magnesium

D:

phosphates of sodium and potassium

Answer: C

No answer description is available. Let's discuss.

📖

Application of quaternary ammonium compounds as sanitizing agents tends to

A:

favor gram positive bacteria

B:

decrease gram positive bacteria

C:

increase the percentage of gram(-)ve rods on utensils

D:

none of the above

Answer: C

No answer description is available. Let's discuss.

📖

Secondary treatment uses __________ to consume wastes.

A:

micro-organisms

B:

chemicals

C:

filtration

D:

none of these

Answer: A

No answer description is available. Let's discuss.

📖

Temporary hardness of water is caused by the presence of

A:

chlorides of calcium and magnesium

B:

sulfates of calcium and magnesium

C:

bicarbonates of calcium and magnesium

D:

carbonates of sodium and potassium

Answer: C

No answer description is available. Let's discuss.

📖

Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

A:

10% calcium chloride solution

B:

10% magnesium sulfate solution

C:

10% magnesium chloride solution

D:

10% sodium chloride solution

Answer: D

No answer description is available. Let's discuss.

📖

Questions for: Water Treatment