MCQ
Laws of Chemical Combination
By Sakshi Goel | 18 May'20 | 937 Views
MCQ
Problem:
Solution:
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Carbon forms two oxides containing 42.9 % and 27.3 % carbons respectively. Which law of chemical combination does this illustrate?
Solution:
In 100 g of first oxide, carbon is 42.9 g and oxygen is (100-42.9) = 57.1 g
So, 42.9 parts of carbon contains 57.1 g of oxygen. The ratio of oxygen:carbon = 57.1:42.9 or 1.33:1
Similarly, in 100 g of 2nd oxide, carbon is 27.3 g and oxygen is (100-27.3) = 72.7 g
So, 27.3 parts of carbon contains 72.7 g of oxygen. The ratio of oxygen:carbon = 72.7:27.3 or 2.66:1
Ratio of masses of oxygen in both oxides is 1.33:2.66 or 1:2.
This illustrates law of multiple proportions.
Correct option is (b).
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