Write balanced chemical equations for the preparation of Hydrogen, when the following are used :
(i) Alkali
(ii) Non metal
(i) Hydrogen from alkali
Zn+2NaOH⟶Na2ZnO2[sodium zincate]+H2[g]\text{Zn} + 2\text{NaOH} \longrightarrow \underset{\text{[sodium zincate]}}{\text{Na}_2\text{ZnO}_2} + \text{H}_2 \text{[g]}Zn+2NaOH⟶[sodium zincate]Na2ZnO2+H2[g]
(ii) Hydrogen from non-metal
Chot coke+H2Osteam→1000°C[CO+H2]water gas−Δ\underset{\text{hot 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 ]} - \Deltahot cokeC+steamH2O1000°Cwater gas[CO+H2]−Δ
