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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
    $X _2 CO _3$
  • B
    $X _2\left( CO _3\right)_2$
  • C
    $XCO _2$
  • ✓
    $X _2\left( CO _3\right)_3$
✓

Answer

Correct option: D.
$X _2\left( CO _3\right)_3$
Charge on carbonate ion is $-2$ and on oxide is also $-2 .$
So formula of the carbonate will be $X _2\left( CO _3\right)_3$

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