Question

Which of the following pairs of substances best illustrates the law of multiple proportions? A. H2 and O2 B. NO and NO2 C. P2O5 and PH3 D. CaCl2 and CaBr2 NO and NO2 best illustrates the law of multiple proportions.

Answer 1

As It's mentioned in your question: NO and NO2 best illustrates the law of multiple proportions. That's true, as there's two same elements combined with each other but with different proportions.

Answer 2

Answer: The correct answer is
`NO and NO_2`.

Step-by-step explanation:

Law of multiple proportions states that 'whenever two elements combine together to give more than one compound, the ratio of mass of one of the element which combines with a fixed mass of the other, bears a simple whole number ratio'.

In NO ratio of masses of nitrogen and oxygen is : 14 : 16

In
`NO_2` ratio of masses of nitrogen and oxygen is: 14 : 32

In
`NO and NO_2` , the mass of the nitrogen is fixed where as mass of oxygen is in the ratio of 16:32 which is a 1:2 and it is a whole number ratio.

`NO and NO_2` illustrates the law of multiple proportions