Hello Durgesh,

Hope you are doing well.

Important Topics:

1. Isotopes of hydrogen
2. Dihydrogen: Preparation, properties and uses
3. Hydrides and its three types
4. Difference between structures of ice and water
5. Chemical properties of water
6. Hard and soft water: Definition and methods of removal
7. H 2 O 2 : Preparation, structure and properties
8. Use of dihydrogen as an efficient fuel

Hope this will help you.

Good luck