alleryWashing soda is sodium carbonate decahydrate, formula:
ANa₂CO₃·10H₂O
BNa₂SO₄·10H₂O
CNa₂CO₃
DNaHCO₃
Answer & Solution
Correct answer: A. Na₂CO₃·10H₂O
1. Washing soda is hydrated sodium carbonate, Na₂CO₃·10H₂O.
2. Made by recrystallising sodium carbonate from water.
3. Used in glass-making, paper, detergent industries; also to remove permanent hardness from water.
_Source: syllabus Science Ch 2 §2.4.3 Washing Soda_
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