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Answer 1

Answer:

Rancidity

Food turns rancid when the fats and oils within them get oxidized and the taste and smell of the food changes. Oxidation of fats generates highly reactive molecules in the rancid food which is responsible for the unpleasant odour and flavour. These chemical reactions also reduce the nutrition of the food. Some studies show that rancid food can have harmful health effects if consumed.

Rancidity can be prevented using the following methods:

1. Adding antioxidants (substances which prevent oxidation) to food.
2. Storing food in airtight containers to slow the process of rancidification.
3. Refrigerating food also helps to slow down rancidification.
4. Replacing oxygen in the containers with another gas. For example, to prevent chips from turning rancid, chips manufacturers flush the bags with nitrogen gas.

Corrosion

It is a process where metals are attacked by moisture, acids etc. Some daily examples of corrosion that you may have observed are the black coating that develops on articles made of silver or the green coating on copper articles. Corrosion that occurs on materials made of iron is ‘rusting‘.There are a few ways to keep metals from corroding. They are:

1. Painting the metal surfaces.
2. Powder coating the surfaces.
3. Oiling the metal surfaces.
4. Galvanization – It is the process of applying a protective zinc coating to iron or steel articles, to prevent them from rusting.

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Answer 2

Answer:

When the food items are kept for a long period the fats and oils present in them get oxidised and their smell and taste change. They become rancid and so the process is called rancidity. For example rancid decaying flavour or smell in old cooking oil.

Rancidity can be prevented using the following methods: Adding antioxidants (substances which prevent oxidation) to food. ... Refrigerating food also helps to slow down rancidification. Replacing oxygen in the containers with another gas.

The gradual eating up of metals by action of air, moisture or a chemical reaction (such as an acid) on their surface is called corrosion. The most commonly seen example of corrosion of metals is rusting of iron i.e the formation of a brown flaky substance on iron objects on exposure to moist air.

The two damages caused by corrosion are the waste of valuable resources and contamination of a product. It can be prevented by methods like Alloying, Galvanizing, and Electroplating.

Corrosion can be prevented by putting a layer of noncorrodible metal on a corrodible metal.

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