The correct option is 2 i.e. Sodium Carbonate
Key Points
- Sodium Carbonate is also known as washing soda it is a salt of carbonic acid.
- Sodium carbonate can be manufactured by Solvay's process.
- It is used for treating hard water and industrial detergent mixtures.
- The aqueous solution of sodium carbonate is alkaline.
- Calcium Sulphate exists in the forms of white solids and is not soluble in water.
- Plaster of Paris and Gypsum are its hydrates.


