Which of the following processes can remove both temporary as well as permanent hardness of water?

Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of

A

Calcium sulphate

B

Sodium chloride

C

Sodium sulphate

D

Magnesium chloride

Presence of __________ hardness is responsible for the temporary hardness in water.

A

Carbonate

B

Calcium

C

Choride

D

Sulphate

Temporary hardness of water can be removed by

A

Addition of alum (a coagulant)

B

Boiling

C

Filtration (through gravity sand filter)

D

Addition of lime

Magnesium and calcium __________ cause temporary hardness of water.

A

Carbonates

B

Bicarbonates

C

Phosphates

D

Sulphates

Boiling of water containing temporary hardness produces

A

CO₂

B

CaSO₄

C

CaHCO₃

D

None of these

Permanent hardness of water can be removed by

A

Simply boiling

B

Adding alum

C

Passing it through cation & anion exchangers

D

All of the above

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

A

Total alkalinity

B

Total hardness

C

Total hardness total alkalinity

D

Non carbonate hardness

Which of the following is not responsible for causing permanent hardness of water?

A

Ca(HCO₃)₂

B

CaCl₂

C

MgCl₂

D

None of these

পানির স্থায়ী খরতার জন্য কোনটি দায়ী নয়? (Which is not responsible for the permanent hardness of water?)

A

CaCl2

B

MgSO4

C

MgCO3

D

CaSO4

The method that cannot be used for removing permanent hardness of water is

A

adding sodium carbonate

B

distillation

C

adding caustic soda

D

boiling

Which of the following processes can remove both temporary as well as permanent hardness of water?

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