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Which of the following pairs can be cited as an example to illustrate the law of multiple proportion?

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${Na}_{2} O, K_{2} O$

$CaO, MgO$

${Al}_{2} O_{3}, {Cr}_{2} O_{3}$

$CO, {CO}_{2}$

answer is D.

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Detailed Solution

CO,CO₂... weight ratio of 'O' combining with fixed weight of carbon is 1:2
CO, CO₂obey law of multiple proportions.

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