Question

A mixture of $2.3 \,g$ formic acid and $4.5 \,g$ oxalic acid is treated with cone. $H_2SO_4$. The evolved gaseous mixture is passed through $KOH$ pellets. Weight (in $g$ ) of the remaining product at $STP$ will be

• A. 4.4
• B. 1.4
• C. 2.8
• D. 3

Answer 1

Answer: (C)

2.8

Answer 2

Gaseous mixture formed is $CO$ and $CO _{2}$ when it is passed through $KOH$, only $CO _{2}$ is absorbed. So the remaining gas is $CO$.

So, weight of remaining gaseous product $CO$ is

$\frac{2}{20} \times 28=2.8\, g$