General Science
Gypsum is added to cement clinker to

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

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General Science
Among the various allotrope of carbon

Coke is the hardest, graphite is the softest
Diamond is the hardest, coke is the softest
Diamond is the hardest, graphite is the softest
Diamond is the hardest, lamp black is the softest

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