Chemistry – Old is Gold

Equivalent Mass

1. Equivalent weight of an element is 32.5. What does it mean?
2. Why is hydrogen displacement method not applicable to determine the equivalent mass of

Metal and Metallurgical Principles

1. Name the process for concentration of sulphide ore.
2. Which metals can be extracted from the following ores:
Galena, cinnabar, argentite and zinc

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