A. Calcium sulphate
B. Sodium chloride
C. Sodium sulphate
D. Magnesium chloride
Related Mcqs:
- Magnesium and calcium ______________ cause temporary hardness of water ?
A. Carbonates
B. Bicarbonates
C. Phosphates
D. Sulphates - Permanent hardness of water is due to the presence of calcium & magnesium __________________?
A. Bi-carbonates
B. Sulphates & chlorides
C. Carbonate
D. None of these - Zeolite used in water softening process (cation exchange) is regenerated by washing with___________________?
A. Brine
B. Chloramines
C. Sodium bisulphite
D. Liquid chlorines - Which of the following processes can remove both temporary as well as permanent hardness of water ?
A. Filtration
B. Boiling
C. Distillation
D. None of these - 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 - Permanent hardness of water can be removed by___________________?
A. Boiling
B. Adding Ca(OH)2
C. Boiling it with Na2CO3
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 (A), B. and (C) - 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 - Permanent hardness of water can be removed by_________________?
A. Addition of soda ash to it
B. Treating it with zeolites
C. Passing it through sodium hexametaphosphate
D. All A , B, and C. - Zeolite is a/an___________________?
A. Naturally occuring clay which is capable of exchanging cations
B. Abrasive material
C. Catalyst used in shift conversion
D. None of these
