MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
What is the formula of aluminium carbonate?
Think it through first, then pick an option.
- a AlCO₃
- b Al₂CO₃
- c Al₂(CO₃)₃
- d Al(CO₃)₃
Answer and explanation
Correct answer: c Al₂(CO₃)₃
Al is 3 and CO₃ is 2; crossing over gives Al₂(CO₃)₃.
Why the other options are wrong
- a AlCO₃: The valencies 3 and 2 are not equal; crossing over gives Al₂(CO₃)₃.
- b Al₂CO₃: The 2 on Al is right, but Al's valency 3 did not go onto carbonate; three CO₃ are needed.
- d Al(CO₃)₃: Carbonate's valency 2 did not go under Al; the right formula is Al₂(CO₃)₃.
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