CaCO3+H2C2O4→CaC2O4+CO2+H2O
CaC2O4+H2SO4→CaSO4+H2C2O4
5H2C2O4+2H2SO4+2KMnO4→K2SO4+2MnO4+8H2O+10 CO2
g100×2=351000×0.04×5 ( g=CaCO3 এর ভর); g=0.35 gm
0.35 gm চুনাপাথরে CaO এর শতকরা পরিমাণ=56100×0.35=0.196 gm
ঐ চুনাপাথরে CaO এর শতকরা পরিমাণ=0.196×1000.41=47.81% Ans.
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