A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be [2018]

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Solution

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 [2018]

1 1.4

2 3.0

3 2.8

4 4.4

Ans.
(3)

$H_{2} O$ gets absorbed by conc. $H_{2} {SO}_{4}$ . Gaseous mixture (containing CO and $C O_{2}$ ) when passed through KOH pellets, $C O_{2}$ gets absorbed.

Moles of CO left (unabsorbed) = $\frac{1}{20} + \frac{1}{20} = \frac{1}{10}$

Mass of CO = moles $\times$ molar mass = $\frac{1}{10} \times 28 = 2.8$ $g$

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