Correct answer is (b) Sodium carbonate
Explanation: Sodium carbonate, also known as washing soda, is an inorganic compound with the chemical formula Na2CO3. It is a white, odorless, water-soluble solid that exists in two main forms: anhydrous (without water) and hydrated (with water). The hydrated form, Na2CO3·10H2O, is more commonly known as washing soda.