EASY
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IMPORTANT
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Which of the following reactions is not correct according to the law of conservation of mass?
(a)
(b)
(c)
(d)

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Important Questions on Atoms and Molecules
EASY
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IMPORTANT
Consider the following laws:
- Law of conservation of mass
- Law of definite proportions
- Law of multiple proportions
Which of these govern(s) the quantitative aspects of chemical changes?

EASY
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IMPORTANT
Ammonia obtained from different sources always has same proportion by mass of nitrogen and hydrogen. It proves the validity the law of:

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