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Atoms and Molecules — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
Question
An element $X'$ has valency equal to $3$. What will be its formula with carbonate ion?
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Answer

Charge on carbonate ion is $-2$ and on oxide is also $-2.$
So formula of the carbonate will be $\ce{X2(CO3)3}$

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