Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A sample of chalk contains clay as impurity. The clay impurity loses 11% of its weight as moisture on prolong heating. 5 gram sample of chalk on heating shows a loss in weight (due to evolution of CO 2 and water) by 1.1 g. Calculate % of chalk (CaCO 3 ) in the sample. [Hint : Chalk (CaCO 3 ) release CO 2 on heating]
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION
Let x g chalk (CaCO 3 ), (5 – x) g clay present
wt of H 2 O + wt of CO 2 = 1.1
(5 – x) × 
+ 
× 44 = 1.1
so x = 5/3
so % of chalk = 
× 100 = 33.33%.
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