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Mass of $C a O$ that shall be obtained by heating 20kg of 90% pure lime stone $(C a C O_{3})$ is

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$11.2 k g$

$16.8 k g$

$10.08 k g$

$8.4 k g$

answer is C.

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Detailed Solution

$C a C O_{3} \overset{Δ}{\to} C a O + C O_{2}$

Pure lime in 20 kg = $\frac{20 \times 90}{100} = 18 k g$

CaO produces = $\frac{56 \times 18}{100} = 10.08 k g$

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