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.
Preliminary Idea of Reaction Mechanism
1. Define electrophile and nucleophile with one example each.
Phosphorous- Old is Gold
1. Name different amorphous forms of phosphorous.2. Write the Lewis structure of orthophosphoric acid and phosphate ions.3. What happens when white phosphorus is heated with