What is the chemical name of washing soda?
Answer and explanation
Correct answer: Sodium carbonate decahydrate
The governing concept is water of crystallisation in salts. Washing soda is sodium carbonate decahydrate, written as Na₂CO₃·10H₂O, so each formula unit contains ten molecules of crystallisation water. It is used for cleaning and for removing the permanent hardness of water. Sodium hydrogen carbonate is baking soda, calcium oxychloride is bleaching powder, and sodium chloride is common salt. Therefore, option A is correct.
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 salts. Washing soda is sodium carbonate decahydrate, written as Na₂CO₃·10H₂O, so each formula unit contains ten molecules of crystallisation water. It is used for cleaning and for removing the permanent hardness of water. Sodium hydrogen carbonate is baking soda, calcium oxychloride is bleaching powder, and sodium chloride is common salt. Therefore, option A is correct.
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.
