A mixture of formic acid and oxalic acid is heated with conc.H2SO4. The gas produced is collected and on treatment with KOH Solution. The Volume of the solution decreases by 1/6th the molar ratio of the two acids in the original mixture is

Total no. of moles of CO  and CO₂ 
= a + b + b
= a + 2b
Total no. of moles of CO₂ = b
Moles fraction of CO2 absorbed in KOH
= b/a+ 2b

According to given condition
= b/a+ 2b = 1/6

a = 4b

Ratio of molar ratio of the two acids in the original mixture
= HCOOH / H₂C₂O₄
= 4 /1
Answer