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Question

Assertion (A): Calcium chloride addition in concrete proves more effective in slow- hardening portland

cement than in rapid- hardening cement 

Reason (R): Calcium chloride acts as an effective accelerator thereby increasing rate of reaction.
A.
Both A and R are true and R is the correct explanation of A
B.
Both A and R are true and R is the not the correct explanation of A
C.
A is true but R is false
D.
A is false but R is true
Answer ( Option A)

Both A and R are true and R is the correct explanation of A

Solution

Calcium chloride acts as an acclerator which increases the rate of hydration reaction in cement that is why its use in slow hardening cement proves more effective than in rapid hardening cement which already have high rate of reaction.

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