Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?
Correct answer: B. CO2 escapes continuously
- A. CaO is not dissociated
- B. CO2 escapes continuously
- C. Of high calcination temperature
- D. CaO is more stable than CaCO3
Explanation
Continuous removal of CO2 lowers its partial pressure and shifts CaCO3 decomposition toward CaO and CO2, allowing the reaction to proceed further. High temperature helps, but continuous CO2 escape is the key reason for completion.
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