Question

A mixture of $2.3g$ formic acid and $4.5g$ oxalic acid is treated with conc. $H_{2}S{O}_4$. The evolved gaseous mixture is passed through $KOH$ pellets. Weight (in $g$) of the remaining product at STP will be:

• A. 2.8
• B. 3
• C. 1.4
• D. 4.4

Answer 1

The correct option is A 2.8


Gaseous mixture formed is $CO$ and $C{O}_2$. When it is passed through $KOH$, only $C{O}_2$ is absorbed. So the remaining gas is $CO$. So, weight of remaining gaseous product $CO$ is $\frac{2}{20}\times 28=2.8g$