Identify the correct statement which corresponds to accelarator retarder.

C a C l_{2} : C a S O_{4}

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N a O H : K O H

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N a C l : C a C l_{2}

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K O H : N a O H

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Solution

The correct option is A $C a C l_{2} : C a S O_{4}$
Retarder is used to slow down the setting rate of concrete which is used to counteract the accelerating effect of hot weather on concrete setting. Ex. $C a S O_{4}$ .
Accelerators make concrete set faster rapidly after mixing with concrete. As high temperature after cause an increased rate of hardening which makes placing and finishing difficult. Ex. - $C a C l_{2}$

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