explain the terms corrosion and rancidity for 5 mark with example each
Answers
Corrosion is a natural process that 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 moisture and air.
Rancidity generally is the complete or incomplete oxidation or hydrolysis of fats and oils when exposed to air, light, or moisture or by bacterial action, resulting in unpleasant taste and odor.
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Corrosion-------
The process in which metals are eaten up gradually by the action of air, moisture or a chemical (such as acid) on their surface, is called corrosion. Rusting of iron is the most common example of corrosion. Rusting involves unwanted oxidation of iron metals which can occur in nature on its own. When an iron object is left in damp air for a considerable time it gets covered with a Red Brown flaky substance called 'Rust'. the corrosion of iron is continuous process which, if not prevented in time it eats up the whole iron object.
EXAMPLE--- rusting of Iron , zinc and copper.
Rancidity----------
Oxidation has damaging effect on food containing fats and oils. When the food material prepared in fats and oil are kept for a long time, they start giving unpleasant smell and taste. The condition produced by the aerial oxidation of fats and oil in foods marked by unpleasant smell and taste is called rancidity. Rancidity spoils the food material prepared in fats and oil which have been kept for a considerable time and makes them unfit for eating.
EXAMPLE---- if a Potato Chips prepared in oil are kept exposed to air for a long time they start giving unpleasant smell and taste due to the oxidation of oil present in them. The potato chips turns rancid and become unfit for eating.