Which of the following is not a preservative?

Which of the following is a narrow spectrum antibiotic?

Which of the following are not supposed to treat humans directly?

What is the use of trisodium phosphate in soap powders?

A certain antibiotic X is effective only against a few types of harmful microbes and cells. X is a ___ antibiotic.

Which of the following tranquilizers cannot be part of sleeping pills?

Identify the cationic detergent from the following.

Identify the incorrect statement with respect to antibiotics.