What are the following substances? Give one example of each of them.

(b) (i) and (iii) 

[Hint : D.P.                   D.M.                        Example (a) Solid/liquid           ...

Biodegradable wastes Non-biodegradable wastes Waste materials which can be broken down into harmless substance in nature in due course of time by the action of microorganisms such as certain bacteria are called...

i. Rancidity: The oxidation of oils and fats in foods resulting into a bad smell and bad taste is called rancidity. ii. To prevent rancidity, substances called ‘antioxidants’ are added to...

Biodegradable wastes Non-biodegradable wastes Waste materials which can be broken down into harmless substances in nature in due course of time by the action of microorganisms such as certain bacterias are called...

Type of Colloid   Dispersed Phase   Dispersion medium   Example   Aerosol Solid or liquid Gas Smoke, Fog, Cloud Hydrosol Solid Water Starch sol, Protein sol Emulsion Liquid Liquid Milk, hair cream

(i) Antacids: Chemical substances which removes the excess acid in the stomach & raise the pH to appropriate level, e.g., sodium hydrogen carbonate, a mixture of aluminium and magnesium hydroxide,...

(i) Non-ionic detergents: These are the esters of high molecular mass alcohols with fatty acids. These are named so because they do not contain any ion in their constitution, e.g.,...

(i) Food Preservatives: These are the chemical substances which are added to the food materials to prevent their spoilage due to microbial growth and to retain their nutritive value for...

(i) Tranquillizers are a class of chemical compounds used for the treatment of stress, fatigue, and mild or even severe mental diseases. These relieve anxiety, stress, irritability or excitement by...