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(C) Dehydration of formic acid $(HCOOH)$ with conc. $H_2SO_4$ is a laboratory method,not a commercial one.$(B)$ Direct oxidation of carbon in limited

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Passing steam over hot coke

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(C) Dehydration of formic acid $(HCOOH)$ with conc. $H_2SO_4$ is a laboratory method,not a commercial one.$(B)$ Direct oxidation of carbon in limited supply of oxygen is difficult to control on a commercial scale.$(C)$ Passing steam over hot coke at high temperatures produces water gas $(CO + H_2)$,which is a standard commercial process:$C(s) + H_2O(g) \xrightarrow{1273 \ K} CO(g) + H_2(g)$$(D)$ Heating limestone $(CaCO_3)$ produces $CO_2$,not $CO$.Therefore,option $(C)$ is the correct answer.

Which one of the following methods is used to prepare carbon monoxide on a commercial scale?

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