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Q.

50gr of calcium carbonate was completely burn in air. What is the weight (in grams) of the residue?

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a

28

b

2.8

c

4.4

d

44

answer is B.

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Detailed Solution

$\begin{array}{l} {CaCO}_{3} \to Cao + {CO}_{2} \\ 100 gr \to 56 gr \\ 50 gr \to 28 gr \end{array}$

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