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Question

100 cc of carbon monoxide was mixed with excess of oxygen and exploded. Find the volume of oxygen used and the volume of carbon dioxide formed:

A
50cc,100cc
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B
100cc,150cc
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C
150cc,200cc
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D
200cc,250cc
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Solution

The correct option is A 50cc,100cc
The balanced chemical equation for the combustion of CO is
2CO+O22CO2
2 moles of CO react with 1 mole of O2 to form 2 moles of CO2.
Volume of a gas is directly proportional to the number of moles.
Hence, 2 cc of CO react with 1 cc of O2 to form 2 cc of CO2.
100 cc of CO react with 100×12=50 cc of O2 to form 100 cc of CO2.
Thus, the option (A) is the correct answer.

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