Find how many g of calcium oxide will be obtained by intensely heating 10 g of calcium carbonate. Consider that calcium carbonate has completely decomposed. [Ca = 40, C = 12, O = 16]
(a) 4.4 g
(b) 5.6 g
(c) 10 g
(d) 100 g
WBBSE
Class X
Physical Science
Chemical Calculations
01 Mark
2025
(b) 5.6 g
Explanation
Chemical Equation: CaCO₃ → CaO + CO₂
Masses →          100      56
From the balanced equation,
100 g of CaCO₃ produces 56 g of CaO.
Therefore, Mass of CaO obtained from 10 g of CaCO₃
= \frac{56}{100}\times10
= 5.6 g
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