Water gas is produced by passing steam over red hot ______.

Fill in the blanks.

Water-gas is formed when _______ is passed over __________ coke. (water/steam/red-hot/cold)

Steam is passed over hot coke at 1000${}^{\mathrm{o}}\mathrm{C}$ in a converter to produce Hydrogen gas$\left({\mathrm{H}}_2\right)$.

When steam is passed over red hot coke, then a mixture of carbon monoxide and hydrogen gas is formed. This is called _____ gas.