Permanent hardness of water can be removed by_________________?
Correct answer: D. All A , B, and C.
- A. Addition of soda ash to it
- B. Treating it with zeolites
- C. Passing it through sodium hexametaphosphate
- D. All A , B, and C.
Explanation
Soda ash precipitates calcium and magnesium carbonates, zeolites exchange hardness ions for sodium, and sodium hexametaphosphate sequesters them. Therefore all three listed treatments can control or remove permanent hardness in the standard textbook sense.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Chemical Process Principles
2,710 free Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Chemical Process Principles questions
Enamels______________________?
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on ____________________?
Glycerine is a by-product of the ________________ industry ?
CaCl(OCl) is the chemical formula of___________________?
Bio-degradable detergents ___________________?
Laboratory glass wares which reacts with hydrofluoric acid, are made of the ______________ glass?