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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 ? (At. wt. of Mg = 24)

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a

96

b

60

c

75

d

84

answer is C.

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Detailed Solution

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MgCO384g MgO40g+CO2

20g MgCO3 should give MgO = 40×2084

                                                   = 9.52 g

9.52g MgO  100% purity of MgCO3

8g MgO100×89.52=84%purity

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