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Question

100 ml mixture of Co and CO2 is mixed with 30 ml of oxygen and sparked in a eudiometer tube. The residual gas after treatment with aqueous KOH has a volume of 10 ml which remains unchanged when treated with alkaline pyrogallol. If all the volumes are under the same conditions, point out the correct option(s).


A

The volume of CO that reacts, is 60 ml

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B

The volume of CO that remains unreacted, is 10 ml

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C

The volume of O2 that remains unreacted, is 10 ml

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D

The volume of CO2 that gets absorbed by aqueous KOH, is 90 ml

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Solution

The correct option is D

The volume of CO2 that gets absorbed by aqueous KOH, is 90 ml


2CO+O22CO2 The residual gas is CO.
Volume of CO oxidised =2×30=60 ml; Volume of CO = 60 + 10 = 70 ml
Volume of CO2 formed = 60 ml; Volume of CO2 absorbed by KOH = 3 + 60 = 90 ml


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