Answer:
CO
Industrial:\[2C+{{O}_{2}}\xrightarrow[air]{Limited}2CO\]
Laboratory: By action
of conc. \[{{H}_{2}}S{{O}_{4}}\]on potassium ferrocyanide.
\[{{K}_{4}}Fe{{(CN)}_{6}}+6{{H}_{2}}S{{O}_{4}}+6{{H}_{2}}O\to
\]\[2{{K}_{2}}S{{O}_{4}}+FeS{{O}_{4}}+3{{(N{{H}_{4}})}_{2}}S{{O}_{4}}+6CO\]
or
By dehydration of formic acid.
\[HCOOH\xrightarrow{Conc,{{H}_{2}}S{{O}_{4}}}CO+{{H}_{2}}O\]
\[C{{O}_{2}}\]
Industrial:\[C+{{O}_{2}}\xrightarrow{Excess}C{{O}_{2}}\]
Laboratory: By action
of dilute \[HCl\] on marble chips.
\[CaC{{O}_{3}}+2HCl\to CaC{{l}_{2}}+{{H}_{2}}O+C{{O}_{2}}\]
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