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in Some Basic Concepts of Chemistry by (30.3k points)
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When two elements combine to form more than one compound the different masses of one of the elements combining with fixed mass of the other bear a simple ratio. 

(i) Name the above law. 

(ii) Explain the above law by taking oxides of carbon.

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(i) Law of multiple proportions. 

(ii) Carbon reacts with oxygen to form two compounds viz. CO and CO . 

In CO2, mass ratio is 12:16 

In CO2 ,mass ratio is 12:32 

Ratio of the masses of oxygen combining with a fixed mass of carbon in the two compounds is 16:32 or 1:2, which is a simple whole number ratio.

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