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.
Ques:
6
Consider the following statements:
Assertion (A) : Chemical fertilizers are necessary for the phosphorus need of plants.
Reason (R) : One metric ton of organic manure can barely supply 2 or 3 kg of phosphorus.
(A) and (R) are true and (R) is the correct explanation of
(A).
Correct Answer:
(A)
and (R) are true but (R) is not the correct explanation of
The fertilizer is a substance added to soil to improve plant growth and yield. Nitrogen, Phosphorus and Potassium (N,P,K) are necessary elements of plants. Only 1.5 to 3 kg of Phosphorus is obtained from 1 metric ton of an organic manure. Thus, chemical fertilizers are necessary for the phosphorus need of plants.
Ques:
7
For wheat cultivation which fertilizer is used?
Correct Answer:
(A)
Nitrogen
Nitrogen is an essential element of plants. For wheat cultivation, the nitrogen fertilizer is most important for its growth and development. The deficiency of nitrogen is probably the most common nutritional problem affecting the plants.
Ques:
8
The element not provided by the fertilizers is –
Correct Answer:
(B)
Hydrogen
The fertilizer is a chemical or natural substance added to the soil to increase its fertility. There are at least 16 elements essential for the growth of the plant. Carbon, Hydrogen and Oxygen are derived from carbon dioxide and water. Nitrogen, Phosphorous, Potassium, Calcium, Magnesium, Boron, Chlorine, Copper, Iron, Manganese, Molybdenum and Zinc are normally derived from the soil in the form of inorganic salts.
Ques:
9
Which one of the following fertilizers leaves maximum acidity in the soil ?
Correct Answer:
(B)
Ammonium Sulphate
The soil acidic causes a reduction in the yields of acid- sensitive crops. The acidic soils are readily identified by a soil test showing a low pH value. The soil reaction is alkaline when the pH value is above 7, neutral at 7 and acidic below 7. The extensive use of ammonium sulphate is not recommended on acidic soils because of its greater acidifying properties compared to other nitrogen fertilizers.
Ques:
10
Urea is
Correct Answer:
(A)
A nitrogen containing organic compound
Urea is an organic compound whose chemical formula is CO(NH2)2. Nearly 46.7% of nitrogen in the urea is present in the form of amide. In the field of organic chemicals it is also called carbamide.