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12th Standard English Medium Chemistry Subject Chemistry In Everyday Life Book Back 2 Mark Questions with Solution Part - II updated Book back Questions

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Questions:

Generic 2

3 x 2 = 6

Name one substance which can act as both analgesic and antipyretic.

What are antibiotics?

Which chemical is responsible for the antiseptic properties of dettol.

Generic 3

2 x 3 = 6

What are food preservatives?

How do antiseptics differ from disinfectants?

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Answers Key:

Generic 2

3 x 2 = 6

Aspirin (o - acetyl salicylic acid) - is a substance which lowers body temperature and also reduces body pain. So it acts as both analgesic and antiphyretic.

(i) Many micro organisms (bacteria, fungi and moulds) produce certain chemicals which inhibit the growth or metabolism of some other micro organism. Such chemicals are called antibiotics.
(ii) Eg: Penicillin from the mould penicillium notatum

Dettol is a mixture of chloroxylenol and terpineol which imparts antiseptic properties to it.

Generic 3

2 x 3 = 6

(i) Preservatives are chemicals added to food which are capable of inhibiting, retarding or arresting the process of fermentation, acidification or other decomposition of food by the growth of micro organisms (or)
(ii) Chemical substances which are added to food that prevents the spoilage of food materials by destroying the food - spoiling micro-organisms are called food preservatives.
(iii) Eg: sodium benzoate, NaCl, Acetic acid Sodium metabisulphite, potassium meta bisulphite etc.

S.No	Antiseptics	Disinfectants
1.	Antiseptics are medicines applied to living tissues (living humans).	Disinfectants are applied to inanimated objects.
2.	All the antiseptics are disinfectants.	All the disinfectants are not antiseptics.
3.	They are not ingested or swallowed. Eg: Povidone - iodine.	They can be injected or swallowed. Eg :Hydrogen peroxide, Chlorine compounds