Which of the following is not a method of disinfecting the water? i. electro-katadyn process ii. by the use of iodine and bromine iii. by the use of excess lime
- AOnly (i)
- B(i) and (ii)
- C(i), (ii) and (iii)
- DNoneCorrect
Solution
Concept
Methods of disinfection
Step-by-step solution
1. The electro-katadyn process (silver ions), iodine and bromine, and excess lime treatment are all disinfection methods. 2. So none of the listed methods is "not a method".
Explanation
All three are valid disinfection methods.
Why the other options are wrong
Other options wrongly reject a valid method.
Shortcut
All three are disinfection methods.
Correct answer: D) None