Chlorine is used in water treatment primarily to: MCQ with Answer and Explanation

Chlorine is used in water treatment primarily to:
A. Add minerals
B. Remove suspended particles
C. Improve taste
D. Kill pathogenic microorganisms
Answer: Option D
Solution (By JKSSB Mock Tests)
Chlorine acts as a disinfectant, killing bacteria, viruses, and other pathogens, making water safe for drinking. It forms hypochlorous acid (HOCl) in water which is a strong oxidizing agent. Sedimentation and filtration remove suspended particles. Taste may be affected if excess chlorine or by-products form. Chlorine residual protects water in distribution pipes.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1
Methanol is toxic because it is metabolized to:
A. Acetic acid
B. Ethanol
C. Acetone
D. Formaldehyde and formic acid

Correct Answer: Option D


Explanation:
In the liver, methanol is oxidized to formaldehyde, then to formic acid, which damages the optic nerve and can cause blindness or death. Ethanol is used as an antidote by competing for the enzyme alcohol dehydrogenase.

This question belongs to: Science chemistry
Question #2
The ignition temperature of a fuel is:
A. The temperature at which it boils.
B. The temperature at which it melts.
C. The highest temperature it can reach.
D. The lowest temperature at which it catches fire.

Correct Answer: Option D


Explanation:
The ignition temperature (or kindling temperature) is the minimum temperature to which a fuel must be heated so that it catches fire and starts burning spontaneously. A lower ignition temperature means the fuel is more highly flammable and can ignite more easily at ambient conditions.

This question belongs to: Science chemistry
Question #3
The ability of metals to be drawn into thin wires is called:
A. Sonority
B. Ductility
C. Malleability
D. Conductivity

Correct Answer: Option B


Explanation:
Ductility is the property of metals by which they can be drawn into thin wires. Gold, silver, and copper are highly ductile. Malleability is the ability to be beaten into thin sheets. Sonority is the property of producing a ringing sound when struck. Conductivity refers to heat or electricity.

This question belongs to: Science chemistry