Which one among the following is the chemical formula of gypsum which is an ingredient of cement?

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Q: 37 (NDA-I/2013)

Which one among the following is the chemical formula of gypsum which is an ingredient of cement?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,10,7,5,10,1,1

keywords: 

{'gypsum': [0, 0, 1, 3], 'cement': [0, 0, 1, 4], 'chemical formula': [0, 0, 1, 3], 'ca2si04': [0, 0, 0, 1], 'cao': [0, 0, 0, 3], 'ingredient': [0, 0, 1, 2], 'cas04': [0, 0, 0, 2], 'cas042h20': [0, 0, 0, 1]}