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General Studies (Paper 1) from JKPSC JKAS 2022 Prelims
Subject: General Studies (Paper 1) Science and Technology Jammu & Kashmir Public Service Commission Last updated May 9, 2026
JKPSC Prelims 2022 General Studies (Paper 1)

Consider the following statements regarding purification of water:

1. Chlorine kills pathogenic bacteria but is ineffective against spores and hepatitis viruses.
2. Ozone removes all chlorine and inactivates viruses rapidly.

Which of the above statements is/are correct?

Answer & Explanation

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Correct Answer: Option C — Both 1 and 2
To evaluate these statements, we look at the efficacy and chemical properties of common water disinfectants:
Statement 1 is Correct: While Chlorine is an excellent disinfectant for killing most pathogenic bacteria (like those causing cholera or typhoid), it has limitations. It is generally ineffective against certain highly resistant life forms like bacterial spores (e.g., Clostridium) and has a slower/less reliable inactivation rate for certain viruses like Hepatitis A compared to other methods.
Statement 2 is Correct: Ozone ($O_3$) is a much more powerful oxidizing agent than chlorine. It inactivates viruses (and protozoan cysts like Giardia) much more rapidly. Additionally, because it is an unstable molecule that reacts quickly, it helps in the removal of organic compounds and can effectively eliminate residual chlorine levels in water treatment processes.

Conclusion:
Both statements are scientifically accurate regarding water treatment standards.

Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
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JKPSC JKAS 2022 Prelims

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Exam JKPSC
Recruitment JKAS
Stage Prelims
Year 2022
Subject General Studies (Paper 1)
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