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NEET levelSingle correct optionDifficulty 1 of 3qa132

Sodium oxalate is warmed with concentrated $H X_{2} SO X_{4}$ and the evolved gas mixture is passed through concentrated KOH solution. The remaining gas burns with a blue flame. The gas is:

A $O X_{2}$
B $CO$
C $CO X_{2}$
D $SO X_{2}$

Answer: B

Na X_{2} C X_{2} O X_{4} + H X_{2} SO X_{4} Na X_{2} SO X_{4} + CO + CO X_{2} + H X_{2} O

. KOH absorbs

CO X_{2}

, leaving

CO

which burns with a blue flame.

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