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Q.

A mixture containing 4.5 grams of oxalic acid and 4.6 grams of formic acid is heated with Conc.H₂SO₄. The gaseous mixture obtained is passed through caustic potash. The weight of the left over gas is

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a

3.6 g

b

4.2 g

c

5.6 g

d

4.8 g

answer is B.

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Detailed Solution

A) $\begin{matrix} 90 g \\ H_{2} C_{2} O_{4} \\ 4.5 g \end{matrix} \to_{∆}^{C o n c . H_{2} S O_{4}} \begin{array}{l} 28 g 44 g \\ CO + {CO}_{2} + H_{2} O \\ 1.4 g 2.2 g \end{array}$
B) $\begin{matrix} 46 g \\ HCOOH \\ 4.6 g \end{matrix} \to_{∆}^{Conc . H_{2} {SO}_{4}} \begin{array}{l} 28 g \\ CO + H_{2} O \\ 2.8 g \end{array}$
x=(1.4+2.2+2.8)g=6.8g
Caustic potash absorbs CO₂
y=(1.4+2.8)=4.2g

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