Which of the following reactions increases production of dihydrogen from synthesis gas?

1. CH4(g)+H2O(g)Ni1270 KCO(g)+3H2(g)

2. C(s)+H2O(g)1270 KCO(g)+H2(g)

3. CO(g)+H2O(g)Catalyst673 KCO2(g)+H2(g)

4. C2H6+2H2ONi1270 K2CO+5H2

 
 

Hint: Synthesis gas is a mixture of carbon monoxide, carbon dioxide and hydrogen. 
Synthesis gas is also known as syngas. It is a mixture of CO, CO2 and H2.
The process of producing syn gas or synthesis gas from coal is called 'coal gasification'.
C(s)Coal+H2O(g)SteamNi1270 KCO(g)+H2(g)Syn gas
The production of hydrogen can be increased by reacting carbon monoxide of the syngas with steam in the presence of iron chromate as a catalyst at 673 K.
 
CO(g)+H2O(g)FeCrO4.673 KCO2(g)+H2(g)
CO2 is removed by scrubbing with a solution of sodium arsenite.