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10 g of MgCO(3) decomposes on heating to...

10 g of `MgCO_(3)` decomposes on heating to 0.1 mole `CO_(2)` and 4g MgO. The percent purity of `MgCO_(3)` is (Given that atomic weights of Mg, C and O are 24,12 and 16 u)

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