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Question

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

A
1 : 4
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B
1 : 1
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C
1 : 3
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D
3 : 4
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Solution

The correct option is D 3 : 4
The chemical formula of ferric oxide is Fe2O3 and calcium phosphate is CaSO4. Thus the ratio of oxygen atoms is 3:4.

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