Civil Engineering - Water Supply Engineering - Discussion


The most commonly used chemical for dechlorination of water, is

[A]. sodium thiosulphate
[B]. sodium bisulphate
[C]. sodium sulphite
[D]. sulphur-dioxide
[E]. all the above.

Answer: Option C


No answer description available for this question.

Saksham said: (Nov 7, 2015)  
Answer should be sulphur dioxide its given in text books clearly.

Atul said: (Nov 19, 2015)  
Sulphur dioxide should be the answer and if sulphur dioxide is not in the option then sodium thiosulphate is the answer.

Suraj said: (Sep 12, 2016)  
Sodium Thiosulphate is the correct answer.

Snehal Wankhede said: (Sep 25, 2016)  
Sodium thiosulphate - it is cheapest and widely used.

Raghav said: (Nov 29, 2016)  
I think the answer is E all of above.

Anirban Roy said: (Mar 16, 2017)  
Yes, E is the answer as others are also commonly used.

Mahesh Sinh said: (Apr 7, 2017)  
Sodium thiosulohate is right answer.

Jayanta Mondal said: (Jul 26, 2017)  
I think Option D is the correct answer.

Kamal Joshi said: (Aug 3, 2017)  
E is the correct answer.

Reffer: R. S. Khurmi.

Sanjay said: (Sep 9, 2017)  
Answer is all above E.

Garry said: (Oct 3, 2017)  
Both options C and D are right.

Refer BC Punima.

Swap said: (Oct 8, 2017)  
Sodium thiosulphate.

Er. Dev Chaudhary said: (Mar 27, 2018)  
Sulfur dioxide is most commonly used for dechlorination and is the major focus of this fact sheet. Some dechlorination alternatives include carbon adsorption, sodium metabisulfite, sodium bisulfite, and hydrogen peroxide.

Chetan said: (Apr 9, 2018)  
Here, All options are correct but the question is most commonly used chemical for dechlorination is that "sulphur dioxide".

Abhi said: (Apr 30, 2018)  
According to me, the Answer is E.

Gferan said: (Jun 14, 2018)  
I too think E is the correct option.

Singh said: (Sep 24, 2018)  
Sodium thiosulphate is correct I think.

Sushma Patil said: (Oct 13, 2018)  
Option E all of above is the answer. I also agree.

Partha Khan said: (Dec 16, 2018)  
It is Sodium thiosulphate.

Tikaram said: (Jan 8, 2019)  
Its should bo SO2.

Rabari said: (Jan 11, 2019)  
Sodium thiosulphate is correct.

Ravi said: (Mar 13, 2019)  
Sodium thiosulphate is correct.

Vibha said: (Apr 20, 2019)  
The answer should be E.

Rizu said: (May 11, 2019)  
When residual chlorine is removed from water which is disinfected then the process is known as dechlorination. The most commonly used chemical for dechlorination of water is sulfur dioxide.

Pankaj Dubey said: (Sep 9, 2019)  
Na2So3 is commonly used.

Saqib said: (Sep 22, 2019)  
Sulfur dioxide is most commonly used for dechlorination.

Mamta said: (Jan 19, 2020)  
Answer will be E.

Hardik said: (Jan 24, 2020)  
Yes, the answer will be E.

Peter said: (Sep 14, 2020)  
Thanks for the answer @Chetan.

Parikshit Mahato said: (Sep 16, 2020)  
Agree, the answer could be sulphur dioxide.

Kalloljit said: (Oct 24, 2020)  
All of the above is the correct answer.

Anirban Roy said: (Nov 11, 2020)  
It is either sodium thiosulphate or SO2.

Mirwais Kakar said: (Aug 27, 2021)  
Thanks everyone for explaining it.

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