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Food Preservation covers the techniques used to prevent food spoilage, extending its shelf life while maintaining nutritional value and stopping microbial growth.
In fruits and vegetables, wax emulsion is used for –
Correct Answer:
(B) Extension of storage life
In fruits and vegetables, wax emulsion is used for extension of their storage life. Wax coating is used as a carrier for sprout inhibitors, growth regulators and preservatives of fruits and vegetables. The principal disadvantage of wax coating is the development of off-flavors if not applied properly. Fruits and vegetables can be stored for 10 to 12 days by wax coating.
Ques: 2
Which one of the following substances is used in the preservation of food stuff ?
Correct Answer:
(C) Sodium Benzoate
The chemical formula of Sodium Benzoate is C7H5NaO2. It is widely used as a food preservative, with E number E211. It is the sodium salt of benzoic acid and exists in this form when dissolved in water and its melting point is 410°C.
Ques: 3
Which one of the following is used in food preservation?
Correct Answer:
(C) Benzoic Acid
Benzoic acid (C7H6O2) or C6H5COOH is the colourless crystalline solid and simple aromatic carboxylic acid. The name is derived from gas benzoin. Its salts (e.g. sodium benzoate) are used as food preservative.
Ques: 4
Vinegar is the solution of which of the following?
Correct Answer:
(D)
Acetic acid
Acetic acid (CH3COOH) or ethanoic acid is an organic acid, which is responsible for sour taste and the pungent smell of the vinegar. The physical and chemical properties prove that the vinegar is a solution of acetic acid. It is produced from fermentation of ethanol.
Ques: 5
Acetic acid is weak acid because-
Correct Answer:
(C) It is weakly ionised
Acetic acid is a weak acid because it only partially ionizes in aqueous solution. This means that when acetic acid is dissolved in water, only a small fraction of the molecules break down into ions.