Discussion
Assertion (A): Rapid hardening cement is not the same thing as quick setting cement.
Reason (R): Setting refers to loss of plasticity while hardening refers to gain of strength.
Answer: D
Both are true and the reason gives the distinction: one cement reaches usable strength sooner and the other stiffens sooner, and confusing them can lead to a material quite unsuited to the work in hand. The two properties are specified separately for good reason.
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