The process of adding chlorine to water to kill bacteria is called: MCQ with Answer and Explanation

The process of adding chlorine to water to kill bacteria is called:
A. Filtration
B. Chlorination
C. Ozonation
D. Distillation
Answer: Option B
Solution (By JKExamLibrary)
Chlorination is the disinfection of water using chlorine or chlorine compounds to destroy pathogenic microorganisms. Chlorine reacts with water forming hypochlorous acid (HOCl) which is a strong germicide. Ozonation uses ozone; distillation involves boiling and condensation. Filtration removes particulate matter but not all microorganisms. Chlorination is cost-effective and provides residual protection, though it may produce trihalomethanes as by-products.

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Practice More chemistry Questions

Question #1
Which of the following is a chemical property of a substance?
A. Density
B. Reactivity with acid
C. Melting point
D. Boiling point

Correct Answer: Option B


Explanation:
Chemical properties describe a substance's ability to undergo chemical changes—reactivity with acid, flammability, oxidation states, etc. Melting point, density, boiling point are physical properties that can be observed without changing composition. Reactivity with acid involves formation of new substances. A piece of magnesium reacting with HCl is a chemical change.

This question belongs to: Science chemistry
Question #2
Vulcanized rubber has better properties due to:
A. Addition of plasticizers
B. Cross-linking of polymer chains with sulfur
C. Addition of carbon black
D. Removal of impurities

Correct Answer: Option B


Explanation:
Sulfur forms disulfide cross-links between polyisoprene chains, providing elasticity, tensile strength, and resistance to temperature changes. Carbon black is filler/additive for reinforcement but not the vulcanization agent.

This question belongs to: Science chemistry
Question #3
Which indicator is most suitable for the titration of a weak acid with a strong base?
A. Litmus
B. Methyl orange
C. Phenolphthalein
D. Methyl red

Correct Answer: Option C


Explanation:
In the titration of a weak acid with a strong base, the equivalence point occurs in the basic region (pH > 7) due to the hydrolysis of the conjugate base formed. Phenolphthalein changes color in the pH range of 8.2 to 10.0, making it the most suitable indicator for detecting this basic equivalence point.

This question belongs to: Science chemistry