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

1. A. 2.8
2. B. 3.0
3. C. 1.4
4. D. 4.4

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