State the conditions and give balanced equations for the conversion of –

(a) coke to water gas,

(b) water gas to hydrogen

in the Bosch process.

(a) coke to water gas

$\underset{\text{coke}}{\text{C}} + \underset{\text{steam}}{\text{H}$2\text{O}} \xrightarrow{1000 \degree \text{C}} \underset{\text{water gas}}{[\text{CO} + \text{H}2 ]} - \Delta

(b) water gas to hydrogen

$\underset{\text{water gas}}{[\text{CO} + \text{H}$2 ]} + \underset{\text{excess steam}}{\text{H}2\text{O}} \underset{\text{Fe}2\text{O}3} {\xrightarrow{450 \degree \text{C}}} \text{ CO}2 + 2\text{H}2 + \Delta