Chemistry in Action

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What is the primary function of zinc oxide in talcum powder?

To mask enlarged pores and minor blemishes (correct)

To act as a powder base

To make skin smooth

To absorb secretion

What is the role of BHT in creams?

To remove facial makeup

To act as a cleansing agent

To produce a more active synergistic effect (correct)

To moisturize the skin

What is the primary function of sodium benzoate in food preservation?

To act as an antioxidant

To enhance the texture of food

To prevent spoilage of food due to microbial growth (correct)

To add flavor to food

What is the primary function of antioxidants in food preservation?

To retard the action of oxygen on food Signup and view all the answers

What type of creams are used to save the skin from sunburn in summer?

Sunburn creams Signup and view all the answers

What is the purpose of adding chalk to talcum powder?

To absorb secretion without showing any evidence Signup and view all the answers

What is the role of zinc stearate in baby talcum powders?

To make powder adhere to skin Signup and view all the answers

Which of the following is NOT a function of food additives?

Providing nutritional value Signup and view all the answers

What is the purpose of phenolic antibacterials in deodorants?

To prevent the growth of bacteria Signup and view all the answers

What is the role of fortifying agents in food?

To provide nutritional value Signup and view all the answers

What is the primary function of BHT and BHA in food preservation?

To extend shelf life by preventing oxidation Signup and view all the answers

What is the role of a fixative in perfumery?

To equalize the rate of evaporation of odouriferous components Signup and view all the answers

What is the primary function of talcum powder?

To reduce irritation of the skin Signup and view all the answers

What is the vehicle in a perfume composition?

The ethanol and water mixture Signup and view all the answers

What type of substances are used to impart odour to a perfume?

Both natural and synthetic substances Signup and view all the answers

What is the function of thymol, a naturally occurring phenol derivative?

As a powerful disinfectant Signup and view all the answers

What was discovered by Alexander Fleming in 1929 from the mould penicillium notatum?

Penicillin Signup and view all the answers

What is the purpose of antiseptic dyes in the treatment of infectious diseases?

To treat infectious diseases Signup and view all the answers

What is the mode of action of penicillin as an antibiotic?

It inhibits the synthesis of the bacterial cell wall Signup and view all the answers

What is the advantage of using antibiotics like penicillin in medical practice?

They are effective against a large number of bacterial infections Signup and view all the answers

What is the characteristic structural unit found in tetracyclines?

Hydronaphthacene skeleton Signup and view all the answers

What is the primary use of chloramphenicol in medicine?

Treatment of typhoid fever and related diseases Signup and view all the answers

What is the effect of high concentrations of chloramphenicol on animal and plant cells?

It inhibits their growth Signup and view all the answers

What is the role of antihistamines in the body?

To diminish or abolish the main actions of histamine Signup and view all the answers

What is the specific condition where chloramphenicol is very effective in its treatment?

All of the above Signup and view all the answers

What type of antimicrobial substance is sulphanilamides structurally analogous to?

p-amino benzoic acid Signup and view all the answers

What is the primary function of chloroxylenol in Dettol?

Antiseptic and disinfectant properties Signup and view all the answers

What is the concentration of chlorine used to make water fit for drinking?

0.2 to 0.4 ppm Signup and view all the answers

What is the purpose of adding bithional to medicated soaps?

To reduce the odour produced by bacterial decomposition of organic matter on the skin Signup and view all the answers

What is the typical concentration of iodine in a tincture of iodine?

2-3% iodine solution of alcohol-water Signup and view all the answers