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

Options

A. 1.4
B. 3
C. 2.8
D. 4.4

Answer

C

Explanation

`underset("Formic acid")(H-overset(O)overset(||)(C) - OH) to H_(2)O + CO`
`underset("Oxalic acid")(HO - overset(O)overset(||)(C)- overset(O)overset(||)(C)- OH) overset(H_(2)SO_(4)) to H_(2)O + CO_(2) + CO`
46g of `H - overset(O)overset(||)(C)- overset(O)overset(||)(C) - OH rArr28g` of CO
`therefore` 2.3 g `HCOOH rArr = 1.4g `CO
90g. of oxalic acid `rArr` = 28 g CO
`therefore ` 4.5g oxalic acid `rArr` 1.4 g CO
Total is 2.8g CO
[`H_(2)O` will be absorbed by `H_(2)SO_(4)` and `CO_(2)` will be absorbed by KOH].