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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
An element X' has valency equal to 3. What will be its formula with carbonate ion?
  • A
    X2CO3
  • B
    X2 (CO3)2
  • C
    XCO2
  • D
    X2 (CO3)3
✓

Answer

  1. X2 (CO3)3

Explanation:

Charge on carbonate ion is -2 and on oxide is also -2.

So formula of the carbonate will be X2(CO3)3

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