General Science
Gypsum is added to cement clinker to

Increase the tensile strength of cement
Decrease the rate of setting of cement
Facilitate the formation of colloidal gel
Bind the particles of calcium silicate

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General Science
Amalgams are

Alloys which have great resistance to abrasion
Highly coloured alloys
Alloys which contain mercury as one of the contents
Alloys which contain carbon

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