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20.0 g of a magnesium carbonate sample d...

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What be the percentage purity of magnsesium carbonate in the sample?

A

60

B

84

C

75

D

96

Text Solution

Verified by Experts

The correct Answer is:
B
`MgCO_(3) overset(Delta)toMgO+CO_(2)`
40 g `MgO` obtained from 84g `MgCO_(3)`
then 8 g obtained from `(84)/(40)xx8`
=16.8g `MgCO_(3)`
`therefore%`purity`=(16.8)/(20)xx100=84%`
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