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Question

Which one of the following combinations illustrate the law of reciprocal proportions?

A
N2O3,N2O4,N2O5
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B
NaCl,NaBr,NaI
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C
CS2,CO2,SO2
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D
PH3,P2O3,P2O5
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Solution

The correct option is C CS2,CO2,SO2
In CS2 the ratio of the masses of C:S=12:64
In CO2 the ratio of the masses of C:O=12:32
So, the ratio of the masses of S:O combining with fixed mass of C=64:32=2:1
In SO2, the ratio of the masses of S:O=1:1
So,
21=2×(11)
Hence, this set follows law of reciprocal proportions.

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