Practice question

MCQ

Question

Phenol co-efficient indicates

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Purity of a disinfectant Dilution of a disinfectant Efficacy of a disinfectant Correct Quantity of a disinfectant

Explanation

Phenol coefficient or Rideal-Walker test compares disinfectant killing power to phenol against Salmonella Typhi and Staphylococcus aureus under standard conditions. Higher coefficient indicates greater efficacy than phenol. It measures antimicrobial efficacy, not purity, dilution or quantity of disinfectant preparation.

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