1000+ Chemistry MCQ with Answers Pdf - 1

Question: 1

What is Nessler's reagent?

Nessler's reagent is a solution of mercuric iodide in excess of potassium iodide. It is used in the detection of Ammonia and ammonium salts.

Question: 2

What is meant by tempering?

The quenched steel is reheated to a temperature below red hot and cooled slowly. This process is called tempering.

Question: 3

What is meant by concentration?

Ores are usually associated with unwanted earthly matter called gangue and the removal of this unwanted impurities is called concentration.

Question: 4

What is meant by gravity separation?

The oxide ores are thoroughly crushed, sieved and levigated in a stream of water. The heavier ore particles stay back while the lighter earthly impurities are washed away.

Question: 5

Mention the uses of sulphuric acid?

In the manufacture of fertilizers (example ammonium sulphate)

In making synthetic fibres, plastics, car batteries etc

In the manufacture of glass

In petrol refining and for cleaning metals.