Question : The chemical composition of cement is
Option 1: Limestone and Clay
Option 2: Limestone, Clay and Gypsum
Option 3: Limestone and Iron
Option 4: Clay and Gypsum
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Correct Answer: Limestone, Clay and Gypsum
Solution : The correct option is Limestone, Clay and Gypsum .
Cement is made of clay, limestone, and gypsum. Calcium carbonate comes from limestone, while clay has silica, alumina and iron oxide. Gypsum is added to manage the setting time by delaying the hydration process.
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