Question

crystals of which substance can kill the germs in the water bodies ?
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Answer 1

Answer:

$\huge\tt\blue{chlorine.}$

Explanation:

Chlorine have anti-microbial property, hence it is used to kill germs in water.

Chlorination is the process of adding chlorine to drinking water to kill parasites, bacteria, and viruses.

Answer 2

Answer:

Potassium Permagnet

Explanation:

It exists in crystal form also.