Which is not a method of preparing carbon monoxide on a commercial sca

1.	Which is not a method of preparing carbon monoxide on a commercial scale?
Answer» `C_(S) + H_(2) O_((G)) OVERSET(473 - 1273 K)(to) CO_((g)) + H_(2(g))` `2C_((s)) + O_(2(g)) + 4N_(2(g)) overset(1273 K)(to) 2CO_((g)) + 4N_(2(g))` `2C_((s)) + O_(2(g)) overset(Delta)(to) 2CO_((g))` `HCOOH underset(conc.H_(2)SO_(4))overset(373 K)(to) H_(2)O + CO` Solution :HCOOH on DEHYDRATION gives CO. This METHOD is used for producing CO at small scale.

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