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Question

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

Answer

(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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