If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to

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Q: 86 (CDS-I/2010)
If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,37,16,9,1,6,37

keywords: 

{'bubble evolves': [0, 0, 1, 0], 'bubbling': [0, 0, 1, 0], 'limestone piece': [0, 0, 1, 0], 'carbon dioxide': [2, 0, 5, 6], 'hydrogen': [0, 0, 1, 3], 'water': [65, 15, 80, 129], 'water vapour': [0, 0, 1, 2], 'oxygen': [3, 0, 1, 0]}