Question

Explain the following terms with one example each :--

(a) Corrosion
(b) Rancidity

Answer 1

Answer:

Explanation:

Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and stopping corrosion

Rancidity is a very general term and in its most general meaning, it refers to the spoilage of a food in such a way that it becomes undesirable (and usually unsafe) for consumption.

Answer 2

(i) The eating up of metals by the action of air, moisture or a chemical (such as an acid) on their surface is called corrosion.

For example: When an iron object is left in damp air (or water) for a considerable time, it gets covered with a red-brown flaky substance called rust. This is called rusting of iron.

                                                                                                                                       

(ii) The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called rancidity. It spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating.

For example: Potato chips are made in oil. On keeping them exposed for a long time, these chips start giving unpleasant smell and taste. They turn rancid.