Chemistry – Old is Gold

Sulphur- Old is Gold

1. How is the moisture present in SO2 gas removed?2. Acid rain forms when oxides of sulphur and nitrogen react with water. What are

Oxygen

1. Write the names of any two neutral oxides with their formulae.2. What are neutral and amhoteric oxides? Give one example of each.3. What are oxiddes? Classify the

Electronic Theory of Valency and Bonding

1. What is Lewis base? Give its examples.
2. What is Lewis acid? Give its examples.
3. Distinguish between a covalent and

Language of Chemistry

1. Define a chemical change and point out its two important characters.2. What information can you obtain from the symbol 3919K?3. How many electrons and neutrons

Halogens (Chlorine, Bromine and Iodine)

1. Why halogens are never found in the Free State in nature?2. A test tube contains a solution of one of the following salts: