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प्रश्न
Write scientific reason.
Always paint grills of doors and windows before using them.
उत्तर
- Grills of doors and windows are generally made up of iron metal.
- Before painting, iron metal is in direct contact with the moisture in the atmosphere.
- Moist air attacks the surface of iron metal and causes rusting (i.e., corrosion of iron).
- Contact between iron and moist air can be avoided by applying paint on grills of doors and windows. This prevents rusting and protects them from damage.
Hence, grills of doors and windows are always painted before they are used.
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संबंधित प्रश्न
Oil and fat containing food items are flushed with nitrogen. Why?
Explain the term Rancidity.
Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time)?
What is the general name of the chemicals which are added to fat and oil containing foods to prevent the development of rancidity?
Fill in the following blank with suitable word:
Anti-oxidants are often added to fat containing foods to prevent .............. due to oxidation.
Explain, by giving an example, how oxidation and reduction proceed side by side.
What damage is caused by rancidity?
What type of chemical reaction is responsible for causing rancidity?
State and explain the various methods for preventing or retarding rancidity of food.
The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is:
(a) acidity
(b) radioactivity
(c) rabidity
(d) rancidity
If edible oil is left aside for a long time, it will get rancid.
All the methods mentioned below can be used to prevent the food from getting rancid except:
(i) Storing the food in air-tight containers.
(ii) Storing the food in the refrigerator.
(iii) Keeping the food in clean and covered containers.
(iv) Always touching the food with clean hands.
A substance added to food containing fats and oils is called ____________.
