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Q.

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%
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