The correct options are
B (X) is water gas
C Catalyst (Y) is Fe2O3+Cr2O3
D CO2 is removed by passing the gaseous mixture through water under high pressure of 25 atm
The sequences given is Bosch's process.
Red hot coke+Steam1000 oC−−−−→CO+H2Water gasSteam, 500 oC−−−−−−−−−→Fe2O3+Cr2O3CO2+2H2
Mixture of CO and H2 is known as water gas.