Chemical Methods

Q.

Name some of the preservatives which are used in the preservation of fruits as jams and jellies.

Q.

Which of the following cannot be used as a food preservative ?

(a) sodium metabisulphite (b) sodium hydroxide (c) sodium benzoate (d) citric acid

Q.

Name any two special chemicals which are used as food preservatives.

Q.

The chemicals that are generally used to check the growth of microorganisms are called __.

Q. Chemicals used to control weeds are known as .

1. weedicides
2. insecticides
3. pesticides

Q.

Give reasons for the following:

Cosmetics may contain preservatives, as one of their ingredients.

Q. what Is pasterisation.

Q.

The chemicals that are generally used to check the growth of microorganisms are called __.

Q. Identify the foods that can be preserved by sugar and chemical preservatives.

1. 
2. 
3. 
4. 

Q.

Which substance can be used to kill microorganisms on the kitchen floor?

1. Antibiotic

2. Antiseptic

3. Disinfectant

4. Sulphonamide

Q. Chemicals used to control weeds are known as

1. pesticides
2. insecticides
3. weedicides

Q. Which of the following is used as preservative and flavoring agent?

1. Sulphuric acid
2. Phophoric acid
3. Citric acid
4. Tartaric acid

Q. Identify the foods that can be preserved by sugar and chemical preservatives.

1. 
2. 
3. 
4. 

Q. In jams and squashes, sugar, which reduces moisture, is added along with to check spoilage.

1. salt
2. sodium hydroxide
3. sodium benzoate

Q.

Who discovered the method of pasteurisation?

Q. In jams and squashes, sugar, which reduces moisture, is added along with to check spoilage.

1. sodium benzoate
2. salt
3. sodium hydroxide

Q. In vinegar pickling method, due to the presence of the acidity of the solution increases.

1. lactic acid
2. acetic acid
3. oxalic acid