Chlorine used in water purification acts by: MCQ with Answer and Explanation

Chlorine used in water purification acts by:
A. Removing suspended particles
B. Dissolving salts
C. Killing microorganisms by oxidation
D. Adding flavor
Answer: Option C
Solution (By JKExamLibrary)
Chlorine forms hypochlorous acid (HOCl) which is a strong oxidizing agent that destroys bacteria and viruses. It does not remove particles (filtration does) or dissolved salts.

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Practice More chemistry Questions

Question #1
Which of the following is a decomposition reaction used in black and white photography?
A. 2H₂O → 2H₂ + O₂
B. CaCO₃ → CaO + CO₂
C. 2AgBr → 2Ag + Br₂
D. 2AgCl → 2Ag + Cl₂

Correct Answer: Option C


Explanation:
Silver bromide (AgBr) decomposes on exposure to light (photochemical decomposition) forming silver and bromine: 2AgBr(s) → 2Ag(s) + Br₂(g). This is used in photographic films to capture images. AgCl also light-sensitive but AgBr is primarily used. Calcium carbonate decomposition is thermal. Water electrolysis is electric decomposition.

This question belongs to: Science chemistry
Question #2
The compound CH₄ is named:
A. Methane
B. Propane
C. Ethane
D. Methanol

Correct Answer: Option A


Explanation:
One carbon atom with four hydrogens is methane (CH₄). Ethane is C₂H₆, propane C₃H₈. Methanol is CH₃OH (alcohol). Methane is the simplest alkane.

This question belongs to: Science chemistry
Question #3
In an electrolytic cell, the cathode is the electrode where:
A. Electrons enter the external circuit
B. Anions are discharged
C. Reduction occurs
D. Oxidation occurs

Correct Answer: Option C


Explanation:
Cathode is where reduction takes place (gain of electrons). In electrolytic cells, cathode is negative (connected to negative terminal of battery). Cations migrate to cathode and are reduced.

This question belongs to: Science chemistry