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Oil and fat containing food items are flushed with nitrogen. Why?
Nitrogen is an inert gas and does not easily react with these substances. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in...
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Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil.
(a) Platinum, gold, and silver are used to make jewellery because they are very lustrous. Also, they are very less reactive and do not corrode easily. (b) Sodium, potassium, and lithium...
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Why is sodium kept immersed in kerosene oil?
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept...
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Give a test that can be used to differentiate chemically between butter and cooking oil.
Butter contains saturated fats. Therefore, it cannot be hydrogenated. On the other hand, oil has unsaturated fats. That is why it can be hydrogenated to saturated fats (solids).
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You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
(d) Glycerine
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Which one is an oil yielding plant among the following?
Answer is (b) Sunflower
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Group the following and tabulate them as energy yielding, protein yielding, oil yielding and fodder crop.
(1) Energy yielding— wheat, rice, maize (2) Protein yielding— gram, pigeon gram, lentil, soybean (3) Oil yielding— groundnut, castor, mustard, soybean (4) Fodder crops— barseem, oat, sudan grass
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How can the two emulsions can be distinguished : (a) oil in water type (o/w) and (b) water in oil type (w/o)
[Hint : (a) By dilution test (b) By dye test]
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Oil and fat containing food items are flushed whit nitrogen. Why?
In the presence of oxygen in the air, the fats present in the fatty food are oxidised to compounds which have a bad smell, i.e., the food becomes rancid. Flushing...
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Point out which of the following were brought in with British art: (a) oil painting (b) miniatures (c) life-size portrait painting
Oil painting, life-size portrait painting and use of perspective
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