A mixture of 2.3 g formic acid and 4.5 g 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

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Here 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. Hence, weight of remaining gaseous product CO is 2 20 × 28 = 2.8 g

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