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When is the law of definite proportions ...

When is the law of definite proportions not obeyed ?

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The law of definite proportions is not obeyed when the element exists in isotopic forms. For example, in HCl the element H and Cl may be in the ratio of 1 : 35 and 1 : 37 by mass in case `.^(35)Cl and .^(37)Cl` isotopes are considered.
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DINESH PUBLICATION-MOLE CONCEPT-Concept Based Question
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  3. When is the law of definite proportions not obeyed ?

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