Question -
The mass of CaO that would be obtained by heating 20 kg of 90% pure lime stone is:
Options:
A .  11.2kg
B .  8.4kg
C .  10.08kg
D .  16.8kg
Answer: Option C : C Mass of pure limestone = (90100)×20=18kg CaCO3Δ−→CaO+CO2 100 kg of CaCO3 forms 56 kg of CaO 18 kg of CaCO3 forms (18×56)100=10.08kg ofCaO
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