Which one of the following does not represent the salt, Calcium carbonate?

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Q: (NDA-II/2019)

Which one of the following does not represent the salt, Calcium carbonate?
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question_subject: 

Geography

question_exam: 

NDA-II

stats: 

0,14,15,14,5,5,5

keywords: 

{'calcium carbonate': [0, 0, 1, 4], 'limestone': [2, 0, 1, 0], 'chalk': [0, 0, 0, 3], 'marble': [2, 0, 0, 0], 'lime water': [0, 0, 0, 4], 'salt': [1, 0, 1, 1]}