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:
Boron and Silicon- Old is Gold
1. Write the formula of Borax and boric acid.
2. Give an important use of Silicon.
Atomic Mass and Molecular Mass
1. State Avogadro?s Hypothesis.
2. Explain why atomic weights of elements are not whole number.
3.