What is the chemical name of washing soda?
Answer and explanation
Correct answer: Sodium carbonate decahydrate
The governing concept is water of crystallisation in hydrated salts. Washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O; the ten water molecules are part of its crystalline structure. This makes option C correct. Sodium chloride is common salt, sodium hydrogen carbonate is baking soda, and calcium sulphate hemihydrate is plaster of Paris. Heating washing soda can remove its crystallisation water and change its properties.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate decahydrate
Why is this the correct answer?
The governing concept is water of crystallisation in hydrated salts. Washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O; the ten water molecules are part of its crystalline structure. This makes option C correct. Sodium chloride is common salt, sodium hydrogen carbonate is baking soda, and calcium sulphate hemihydrate is plaster of Paris. Heating washing soda can remove its crystallisation water and change its properties.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
