20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample
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a
75
b
96
c
60
d
84
answer is D.
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Detailed Solution
MgCO3⟶MgO+CO284 g 40 g∴8 g MgO will be from 845g∴% purity =845×10020=84%