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Give preparation of carbon monoxide. |
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Answer» Solution :Direct oxidation of C in limited supply of oxygen or air yields carbon monoxide. `C+1/2O_2 oversetDeltato CO` (ii) Reduction of HEAVY metal oxides with carbon gives CO. `ZnO+C to Zn+ CO` `Fe_2O_3 + 3C to 2FE + 3CO` (iii) On small scale PURE CO is prepared by DEHYDRATION of formic acid with concentrated `H_2SO_4` at 373 K. `underset"Formic acid"(HCOOH) underset("Conc." H_2SO_4)overset(373 K)to CO+ H_2O` (iv) On commercial scale it is prepared by the passage of steam over hot coke. The mixture of CO and `H_2` thus produced is known as water gas or synthesis gas. `C_((s)) + H_2O_((g)) overset"473 K - 1273 K"to underset"water gas (SYNTHETIC gas)"(CO_((g)) + H_(2(g)))` When air is used instead of steam, a mixture of CO and `N_2` is produced, which is called producer gas. `2C_((s)) +O_(2(g)) + 4N_(2(g))overset(1273 K) to ubrace(2CO_((g)) + 4N_(2(g)))_"Producer gas"` Water gas and producer gas are very important industrial fuels. Carbon monoxide in water gas or producer gas can undergo further combustion forming carbon dioxide with the liberation of heat. |
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