Give two examples for each of the following:

1. Hydrated substances
2. Crystalline anhydrous substances
3. Drying agents
4. Deliquescent substances
5. Efflorescent substances
6. Colloids
7. Solvents other than water

What do you observe when Blue vitriol is heated?

What do you observe when Blue litmus solution is added to water?

Give reason:

Silica gel pouches are kept in unused water bottles.