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| Q. |
Chemical composition of cement is – |
| A. | Limestone and Clay |
| B. | Limestone, Clay and Gypsum |
| C. | Limestone and Gypsum |
| D. | Clay and Gypsum |
| Answer» B. Limestone, Clay and Gypsum | |
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Explanation: The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO. |
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