The pair which illustrates law of multiple proportions is

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CO, CO2

H2S, H2O

SO2, H2S

NH3,NF3

answer is A.

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Detailed Solution

According to law of multiple proportions “Different weights of an element combining with the fixed weight of other element bear a simple ratio with one another”.In option 1….. fixed weight of carbon combines with different weights of Oxygen, weight ratio of oxygen is 1 : 2

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