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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

5.6 g

b

4.2 g

c

4.8 g

d

3.6 g

answer is B.

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Detailed Solution

A) 90gH2C2O44.5g→∆Conc. H2SO428g 44gCO+CO2+H2O1.4g 2.2g
B) 46gHCOOH4.6g→∆Conc. H2SO428gCO+H2O2.8g
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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