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JEE Main levelSingle correct optionDifficulty 2 of 3pb190

A convenient laboratory method for preparing carbon monoxide is

Awarming formic acid with concentrated $H X_{2} SO X_{4}$ (dehydration)
Btreating $CaCO X_{3}$ with dilute HCl
Cheating $NaHCO X_{3}$
Dpassing steam over red hot coke

Answer: A

HCOOH conc \cdot H X_{2} SO X_{4}, 373 K CO + H X_{2} O

, with sulfuric acid as dehydrating agent.

CaCO X_{3}

/HCl and

NaHCO X_{3}

give

CO X_{2}

, while steam over coke gives water gas, an industrial route that is a mixture.

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