Which one of the following is the chemical formula of gypsum?

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Q: 56 (NDA-II/2018)

Which one of the following is the chemical formula of gypsum?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,5,4,5,2,1,1

keywords: 

{'chemical formula': [0, 0, 1, 3], 'gypsum': [0, 0, 1, 3], 'ca2sio4': [0, 0, 0, 1], 'caso4': [0, 0, 0, 1]}