Q.

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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answer is 3.

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Detailed Solution

H2O absorbed by H2SO4. Gaseous mixture (containing CO and CO4) when passed through KOH pellets, CO2 gets absorbed. Moles of CO left (unabsorbed) =120+120=110 Mass of CO= moles × molar mass                              =110×28=2.8 g
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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