Addition of chlorine
Boiling
Distillation
Addition of alum
Explanation
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Discussions (17)
The answer is distillation.
Chlorine is a disinfectant, adding chlorine to water kills bacteria and microbes
Boiling kills harmful mico-oraganisms
Alum makes the impurities in the water to clump (join) together to form big particles of dirt which rapidly settle at the bottom leaving the water at the top free from impurities and safer to drink
Distillation is used to purify water FOR LABORATORY USE and NOT FOR DRINKING which makes it the perfect answer here :-D
D. Addition of alum. This only causes coagulation of solid particles in water yet the germs may still be present. Moreover aluminated water is somewhat hard.
A is correct,chlorinated water can't be drunk
chlorinated water is used in swimming pools
I feel the answer should be D. because the rest kill bacteria and germs in the water. Alum just makes the particles of impurities to stick together.
The correct answer is: D. Addition of alum
Explanation:
A. Addition of chlorine – This disinfects water by killing harmful microorganisms. 
Makes water safer to drink.
B. Boiling – Kills bacteria, viruses, and parasites. Makes water safe for drinking.
C. Distillation – Purifies water by boiling and condensing the vapor, removing impurities. Highly effective for producing pure water.
D. Addition of alum – Alum is used to help particles in the water clump together (coagulation), making it easier to filter them out, but on its own, it does not kill germs or purify the water enough for safe drinking. 
So, while alum helps in water treatment, it does not make water fit for drinking on its own unless followed by further purification steps.
For me,there is no clear answer to this
Distillation is from from many contaminants and is very pureBUT
For me there is no clear answer to this
Distillation is free from many contaminants and is very pure BUT it can be very acidic because it lacks minerals and may cause mineral deficiency in the body
On the other hand, addition of alum only coagulates particles and removes some of water impurities but it is not very pure, however, additional steps such as filtration, chlorination or boiling makes it save to drink.
the answer is d because alum only clumps the dirt's together making the impurities to still be present in the water
