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Boiling of water is a _____ method of disinfection.

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Boiling of water is a  _____  method of disinfection.

(a) Physical

(b) Chemical

(c) Mechanical

(d) Electrical

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My question comes from Methods of Disinfection in division Properties of Disinfection of Environmental Engineering

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The correct answer is (a) Physical

Explanation: Boiling of water is a physical method of disinfection which is also called as disinfection by heat.

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