Discussion
Assertion (A): Most of the carbon dioxide from cement manufacture comes from the raw material rather than the fuel.
Reason (R): Calcination decomposes calcium carbonate and releases carbon dioxide directly.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Calcining a tonne of limestone releases carbon dioxide directly from the rock, and that process emission is roughly 60 per cent of the total - more than everything the fuel produces. It is why efficiency and alternative fuels alone cannot decarbonise cement, and why the effort has turned to capture and to alternative binders.
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