12 grams of ${CaCO}_{3}$ sample with non volatile impurities on complete decomposition left 7.6
grams of residue. What is the percentage of impurities in the sample?

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16.6%

32.4%

12.6%

38.2%

answer is A.

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Detailed Solution

$m_{{CO}_{2}} = 12 - 7.6 = 4.4 \Rightarrow {10 gm CaCO}_{3}$

$∴ 2 grams impurity$

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