Question

$C + {H_2}O$ (steam) is passed over red hot coke to produce:
(A). $C{O_2} + {H_2}$
(B). $CO + {O_2}$
(C). $CO + {H_2}$
(D). ${O_2} + {H_2} + C$

Answer 1

Hint:The mixture of carbon and steam when passed over red hot coke it produces a water gas which is a flammable gas.Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. The water-gas shift reaction can be used to oxidise the carbon monoxide while producing additional hydrogen, resulting in water gas.

Complete step by step answer:
When a mixture of carbon and steam is passed are red hot coke to produce a water gas. Water gas is a full gas consisting mainly of carbon monoxide and hydrogen mode by passing steam over red hat coke.
i.e. $H$
$ {H_2}O + C \to CO + {H_2}\left( {\Delta H = + 131KJ/mol} \right) \\
  (steam)(hat) \\
 $
This relation is endothermic so heat must be added to sustain it. There are two ways this is done. One is to cause combustion of some carbon with steam.
${O_2} + C \to C{O_2}$ $:\Delta H = - 393.5KJ/mol$
The other method is to use oxygen gas rather than air, which yields carbon monoacids rather than carbon discoid.
${O_2} + 2C \to 2CO$ $;\Delta H = - 221KJ/mol$
The water gas was first produced in England in 1828 by blousing steam with white hot coke. In 1873, Thaddeus such Laue patented a progress that used the water gas shift reaction to enrich the gas with hydrogen.
Water gas is used to remove carbon dioxide from fuel cells.it is used in fischer-tropsch process and it is also used to obtain pure hydrogen to synthesize ammonia.
We got to know that when a mixture of carbon and steam is passed over red hot coke, water gas $\left( {CO + {H_2}} \right)$ is produced.
Hence the correct option is C.

Note:
Remember that whenever a carbon is heated in presence of air, it gives carbon-diocese as the main product and when it is heated in presence of oxygen, it gives carbon monoxide as the product.