Building Materials
In the method of condensation polymerization,

The reaction proceeds with an evolution of ammonia
All of these
Low-molecular substances are removed from the high molecular substance
The reaction proceeds with an evolution of hydrogen chloride

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Building Materials
The basic purpose of a retarder in concrete is

To improve the workability of concrete mix
To render the concrete more water tight
To decrease the initial setting time of cement paste in concrete
To increase the initial setting time of cement paste in concrete

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