What is the chemical name of washing soda?
Answer and explanation
Correct answer: Sodium carbonate decahydrate
Washing soda is the hydrated salt sodium carbonate decahydrate, written as Na₂CO₃·10H₂O. The ten water molecules are called water of crystallisation and are part of the crystal structure. Therefore option A is correct. Sodium hydrogen carbonate is baking soda, sodium chloride is common salt, and calcium sulphate hemihydrate is plaster of Paris, so these alternatives describe different substances.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate decahydrate
Why is this the correct answer?
Washing soda is the hydrated salt sodium carbonate decahydrate, written as Na₂CO₃·10H₂O. The ten water molecules are called water of crystallisation and are part of the crystal structure. Therefore option A is correct. Sodium hydrogen carbonate is baking soda, sodium chloride is common salt, and calcium sulphate hemihydrate is plaster of Paris, so these alternatives describe different substances.
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.
