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 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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