Which of the following represents the chemical formula of Calcium Carbonate?

CaCO₃

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Ca₂CO₃

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Ca(CO₃)₂

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Ca₃CO₂

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Solution

The correct option is A
CaCO₃

The given compound contains calcium ions and carbonate ions as its constituents.

The Calcium ion is $C a^{2 +}$ and has valency +2.

The Carbonate ion has the formula ${C O}_{3}^{- 2}$ and has valency -2.

By crossing over the valencies and balancing charge, we get the formula as $C a {C O}_{3}$ .

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