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प्रश्न
State why the molecular formula of zinc carbonate is ZnCO3 .
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उत्तर
Molecular formula of zinc carbonate: Zinc and carbonate both have valency
Zn2+ `"CO"_3^(2-)` = 
Divide by H.C.F. 2 exchange of valency
Zn1[CO3]1 = ZnCO3
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