MCQ practice · SSC Chemistry Board questions · Chapter 9: Acid-Base Balance
How many molecules of water are attached in washing soda?
Think it through first, then pick an option.
- a 24
- b 10
- c 7
- d 5
Answer and explanation
Correct answer: b 10
Washing soda is Na₂CO₃·10H₂O, so 10 water molecules.
Why the other options are wrong
- a 24: Not 24; the formula Na₂CO₃·10H₂O shows 10 water molecules.
- c 7: Not 7; it carries 10 molecules of water.
- d 5: Not 5; it carries 10 molecules of water.
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