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Per NCERT, the LAW OF CONSTANT PROPORTIONS states which of the following?
AThe mass of reactants always doubles in reactions
BDifferent samples of water have different compositions
CCompounds can have varying ratios depending on temperature
DA chemical compound always contains the same elements in the same fixed proportion by mass
Answer & Solution
Correct answer: D. A chemical compound always contains the same elements in the same fixed proportion by mass
Per NCERT §9.2, constant proportions = same compound has same elemental mass ratio always. The other options misstate.
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