Question

Define Corrosion and Rancidity and suggest methods for their prevention.

Hint:

{Corrosion → Damage of metals due to chemical reactions.
{Rancidity → Spoilage of fats and oils due to oxidation.

Answer 1

Concept: Many substances undergo chemical changes when exposed to air, moisture, or other environmental conditions. Two common examples are corrosion in metals and rancidity in food substances.
Step 1:Corrosion Corrosion is the slow deterioration or destruction of metals due to chemical reactions with substances in the environment such as oxygen, moisture, or acids. Example: Rusting of iron when it reacts with oxygen and water to form iron oxide (rust). Prevention Methods:

• Painting or coating the metal surface
• Galvanization (coating with zinc)
• Electroplating
• Applying oil or grease

Step 2:Rancidity Rancidity is the process in which fats and oils get oxidized when exposed to air, resulting in unpleasant smell and taste of food. Example: Butter or oily foods left open for a long time develop a bad smell and taste. Prevention Methods:

• Storing food in air-tight containers
• Adding antioxidants
• Refrigeration
• Packing food with nitrogen gas