The ratio between the different weights of oxygen in different compounds which combine with the same weight of nitrogen ($14$ parts) is $8:16:24:32:40$ or $1:2:3:4:5$.
This is simple whole number which supports the law of:

Q. Simple ratio of masses of oxygen which combine with fixed mass of carbon in CO and CO2 is Options: 16 : 32 14 : 16 1 : 2 4 : 8

Q. The weight ratio of two elements A and B which combine with the fixed weight of C separately is either the same or some simple whole number multiple of the weight ratio in which A and B combine together. This statement explains :

Q. Law of constant proportion given by Joseph Proust that a chemical compound always consists of same element combined together in the same proportion by mass but there are some compound which are allotropic for example hydrogen and oxygen forms compound water which can be H2O or D2O that is heavy oxygen so this law should be wrong. This is same compound but with different mass

Q. Kindly tell whether this point is a limitation of law of constant composition-- 1)if element combine in same ratio but the compound formed may be different for example -in the compounds C2H5OH and CH3OCH3(BOTH HAVE SAME MOLECULAR FORMULA C2H6O) the ratio of C:H:O is 24:6:16 or 12:3:8. Thus, the inverse of the law is not correct.