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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, contraction in volume was found to be 80 mL, the composition of initial mixture may be (in the same order):

A
30 mL, 60 mL, 10 mL
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B
30 mL, 50 mL, 20 mL
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C
50 mL, 30 mL, 20 mL
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D
20 mL, 70 mL, 10 mL
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Solution

The correct options are
A 30 mL, 60 mL, 10 mL
B 30 mL, 50 mL, 20 mL
KOH absorbs CO2 gas, so contraction in volume is due to CO2 absorption.
2CO+O22CO2, so total volume of CO2 formed is 80 mL.
(A) 10 mL of O2 reacts with 20 mL CO and 20 mL CO2 forms, so total volume of CO2 is 80 mL.
(B) 15 mL of O2 reacts with 30 mL CO and 30 mL CO2 forms, so total volume of CO2 is 80 mL.

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