Question

drawback of law of constant proportion

Answer 1

Dear Student,
Limitations of law of constant composition are-

(i)This law is not applicable if an element exists in different isotopes which may be involved in formation of compound.e.g.In the formation of CO2, if C-12 isotope & C-14 isotope combine than the C: O is 12:32 & 14:32 respectively.

(ii)The compounds formed may be different but the elements may combine in same ratio.
Regards