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  4. A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be

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Q. A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. $H_{2}SO_{4}$ . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be

NTA AbhyasNTA Abhyas 2020Some Basic Concepts of Chemistry

Solution:

Solution

Here 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.

Hence, weight of remaining gaseous product CO is $\frac{2}{20}\times 28=2.8g$