The ratio of number of oxygen atoms present in one molecule of ferric oxide to those present in one molecule of calcium sulphate is :

1 : 4

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1 : 1

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1 : 3

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3 : 4

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Solution

The correct option is D 3 : 4
The chemical formula of ferric oxide is $F e_{2} O_{3}$ and calcium phosphate is $C a S O_{4}$ . Thus the ratio of oxygen atoms is 3:4.

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The total number of chlorine atoms present in ferric chloride molecule, $F e C l_{3}$ :

Statement I- Atomicity of oxygen molecule is 1.
Statement II- Atomicity is the total number of atoms present in a molecule.

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