Discussion
Assertion (A): Calcium sulphoaluminate cement is not simply a drop-in replacement for Portland cement despite its lower emissions.
Reason (R): It depends on bauxite or other aluminous materials that are far less abundant than limestone.
Answer: B
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. Calcium sulphoaluminate cement emits substantially less carbon dioxide, but it needs an aluminous raw material, and bauxite is neither as abundant nor as widely distributed as limestone. The constraint is on raw material supply rather than on the chemistry, and it caps how far the cement can be adopted.
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