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Question
Work out the formulae for the following compounds:
Calcium carbonate
Solution
Valency of Calcium = 2
Valency of Carbonate ion = −2
Formula for calcium carbonate can be worked out by crossing the valencies of the constituent elements/ions. +2 positive charge of calcium neutralizes the −2 negative charge of carbonate ion.
Therefore, formula for calcium carbonate is: CaCO3.
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