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Question

A mixture of 100 mL of CO, CO2 and O2 was sparked. When the resulting gaseous mixture was passed through KOH solution, the contraction in volume was found to be 80 mL. The composition of the initial mixture may be (in the same order):

A
20 mL, 50 mL, 30 mL
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B
40 mL, 20 mL, 40 mL
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C
30 mL, 50 mL, 20 mL
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D
30 mL, 40 mL, 30 mL
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Solution

The correct option is B 40 mL, 20 mL, 40 mL
Let the initial volume of CO,CO2 and O2 be a, b and c respectively.

Then, a+b+c=100.........(i)

After the reaction, CO+12O2CO2 and the treatment with KOH, a contraction of 80 mL was observed.
This is due to the consumption of oxygen and the absorbtion of CO2
a+b+a2=80 ..............(ii)

Also,
ca2=20............ (iii)

The options should satisfy all the three equations.

a) a = 20 mL b = 50 mL c = 30 mL
It satisfies all the three equations.

b) a = 40 mL b = 20 mL c = 40 mL
It satisfies all the three equations.

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