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The value of x, if hydrated salt `A_(2)SO_(4).xH_(2)O` undergoes 45% loss in mass on heating and becomes anhydrous, is: (where atomic weight of A is 7

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The value of x, if hydrated salt `A_(2)SO_(4).xH_(2)O` undergoes 45% loss in mass on heating and becomes anhydrous, is: (where atomic weight of A is 7).
A. 8
B. 9
C. 10
D. 5
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Correct Answer - D
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