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lesson- Atoms and Molecules
std- 9th
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I am in 7th and then also watching this question . And thanks for the points.
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(Answer no 1) the postulate that atom can either be created or destroyed in a chemical reaction is the result of of conservation of mass .
(Answer no 2) The postulate that a chemical compound always consists of the same element combine together in the same proportion by mass is the law of definite proportion.
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