Answer:
No, law of constant composition is
not true for all types of compounds. It is true only for the compounds obtained
from one isotope. For example, carbon exists in two common isotopes, \[^{12}C\]
and \[^{14}C\]. When it forms \[C{{O}_{2}}\] from \[^{12}C,\] the ratio of
masses is 12 : 32 = 3 : 8 but from \[^{14}C,\] the ratio will be 14 : 32 = 7 :
16 which is not same as in the first case.
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