Q: 90 (NDA-II/2010)

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Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation?
question_subject: 
Science
question_year: 
2010
question_exam: 
NDA-II
stats: 
0,184,208,120,184,32,56