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?

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]}

Option 1: Ca2Si04 - This chemical formula is incorrect. It represents calcium orthosilicate, not gypsum.

Option 2: CaS042H20 - This chemical formula is correct. It represents gypsum, which is indeed an ingredient of cement. The formula contains calcium (Ca), sulfur (S), oxygen (O), and water (H2O) molecules. The presence of water molecules indicates that gypsum is a hydrous calcium sulfate.

Option 3: CaO - This chemical formula is incorrect. It represents calcium oxide, also known as quicklime, which is not the same as gypsum.

Option 4: CaS04. 3H20 - This chemical formula is also correct. It represents another form of gypsum, which contains the same chemical elements but with a different arrangement of water molecules.

Overall, the correct chemical formula for gypsum, which is an ingredient of cement, is CaS042H20 (Option 2).