The Law of Constant Proportions explains why the elemental composition of a specific compound is always the same.
Ammonia (NH3) obtained from different sources always has same proportion of Nitrogen and Hydrogen. It proves the validity of law of:
Asked in UPSC NDA 2 2015 · Topic: Physical and Chemical Changes, Solution (Definition and Characteristics of Chemical Changes (Chemical Reactions))
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Answer: B. Constant proportion
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