Q1) What are food preservatives?
Q2) Write advantages of synthetic detergents over soaps.
Answers
Answer - 1 :
Food preservatives : These are the chemical substances which are added to the food materials to prevent their spoilage and to retain their nutritive value for long periods.
- These preservatives prevent the rancidity of food and inhibit the growth or kill the microorganisms, e.g., table salt, sugar, citric acid, sodium benzoate, sorbic acid, etc.
Answer - 2 :
Advantages of synthetic detergents over soaps :
- They can be used in hard water, in acidic medium while soaps get precipitated.
- They are more soluble in water and thus form lather more easily.
- They are stronger cleansing agents than soaps as they decrease the surface tension to greater extent
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Answer 1 => Food preservation prevents the growth of microorganisms, or other microorganisms, and slowing the oxidation of fats that cause rancidity. Food preservation may also include processes that inhibit visual deterioration, such as the enzymatic browning reaction in apples after they are cut during food preparation.
Answer 2 =>
(i) Detergents work well even with hard water but soaps do not.
(ii) Detergents may be used in saline or acidic water.
(iii) Detergents are more easily soluble in water than soaps.
(iv) Detergents can be used for washing woolen garments whereas soaps cannot be used.
(v) Detergents having linear hydrocarbon chain are biodegradable.