Water in swimming pools is purified by adding

sodium
chlorine
phosphorus
potassium
chlorine  The most common way to purify swimming pool water is to add chlorine. Chlorine is a strong disinfectant that kills bacteria, algae, and other microorganisms. It is added to the water in liquid, tablet, or granular form. Chlorine can be effective in keeping swimming pool water clean and safe, but it is important to use it properly. Too much chlorine can irritate the skin and eyes, and it can also produce harmful byproducts.

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A. magnesium chloride
B. calcium chloride
C. sodium chloride
D. sodium nitrate
The density of air in the atmosphere is
A. uniform
B. not uniform
C. zero
D. none of above
In the body, the weight of blood is about
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B. 1/5th of body
C. 1/8th of body
D. 1/4th of body
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A. Iron
B. Gold
C. Carbon
D. Copper
The energy stored in coal is
A. kinetic energy
B. potential energy
C. chemical energy
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A human breath per minute is
A. 16-30 times
B. 16-20 times
C. 15-20 times
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