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20.0 g of magnisium carbonate sample dec...

20.0 g of magnisium carbonate sample decoposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the prcentage purity of magnesium carbonate in the sample?

A

75

B

96

C

60

D

84

Text Solution

Verified by Experts

The correct Answer is:
D
(d) `MgCO_3cdot ..MgOcdotCO_2 ` `84g of MgCO_3 from 40 g of MgO` `20g ofMgCO_3form(40cdot20)/84g og MgO-9.52g of MgO` since 8.0 g of MgO is formed Purity of sample `cdot8/(9.52)100=84.0%`
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