Which of following is the limitation of the Law of Definite proportions?

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This law does not hold true if the compounds are in gaseous state

This law does not hold true for the compounds of hydrogen

This law does not hold true if the different isotopes of the element are not involved in chemical compound.

This law does not hold true if the compounds are at high temperature

answer is A.

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Detailed Solution

Law of constant proportions does not hold true if the different isotopes of the element are not involved in chemical compound.

Example - For making CO₂ gas, C-12 combines with O in ratio C:O::12:32 while C-14 carbon isotope combines in the ratio C:O::14:32.

Hence, using different isotopes of the element is the limitation of law of constant proportions.

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