Assertion (A): Phenyl is used as a household germicide. Reason (R): Phenyl is a phenol derivative and phenol are an effective germicide.
- ABoth A and R are true, and R is the correct explanation of ACorrect
- BBoth A and R are true, but R is NOT a correct explanation of A
- CA is true, but R is false
- DA is false, but R is true
Explanation
The correct answer is A because both statements are scientifically accurate and linked. Phenyl, commonly used in households for cleaning floors and bathrooms, is a commercial disinfectant formulated from coal tar oil and phenolic compounds. Phenol, also known as carbolic acid, possesses powerful antiseptic and germicidal properties that allow it to destroy or inhibit the growth of microorganisms like bacteria and fungi. Therefore, the fact that phenyl is a derivative of phenol directly explains why it is used as an effective household germicide.
Related questions
More UPSC Prelims practice from the same subject and topic.
- Prelims 1998GS1science-and-technology
A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?
- Prelims 1998GS1science-and-technology
Match List I with List II and select the correct answer using the codes given below the lists: List I (Disease) (Organism) I. Malaria A) Fungi II. Poliomyelitis B) Bacteria III. Tuberculosis C) Virus …
- Prelims 1998GS1science-and-technology
Haemophilia is a genetic disorder which leads to
- Prelims 1998GS1science-and-technology
A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s². What will be its velocity after 3 seconds?
- Prelims 1998GS1science-and-technology
Which one of the following types of micro-organisms is most widely used in industries?
- Prelims 1998GS1science-and-technology
Match the names of outstanding Indian scientists given in List I with area of their specialised work given in List II and select the correct answer using the codes given below the lists: List I List I…