General Science
Gypsum is added to cement clinker to

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

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General Science
Amalgams are

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

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