Q2 of 50 Page 1

What is meant by ‘reverse osmosis’?

Reverse osmosis is the process of passing a solvent from a region having high solute concentration to a region with low solute concentration through a semipermeable membrane (membrane allowing only certain substances to pass through it and disallowing the others) by applying a pressure in excess of the osmotic pressure. This pressure applied is known as osmotic pressure.


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27

(a) Differentiate between a disinfectant and an antiseptic. Give one example of each.
(b) What is tincture of iodine and what is it used for?

 1

Define ‘activation energy’ of a reaction

 3

What type of ores can be concentrated by magnetic separation method?

 14

Describe the principle controlling each of the following processes:

1. Preparation of cast iron from pig iron.


2. Preparation of pure alumina (Al2O3) from bauxite ore.