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Banking Chemistry Some Important Man-Made Materials Question Bank Some Important Man-Made Materials

  • question_answer
    Which one among the following is the main ingredient in cement?

    A)  Gypsum                      

    B)  Limestone  

    C)  Clay               

    D)         Ash

    Correct Answer: B

    Solution :

     The composition of cement is \[CaO\] (lime) or limestone 62%, silica \[(Si{{O}_{2}})\] 22%, alumina \[(A{{l}_{2}}{{O}_{3}})\] 7.5%, magnesia \[(MgO)\] 2.5%, etc. Thus, limestone is the major raw material for cement.


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