Preparation of H2

Question 1

1)Laboratory preparation of H2:
i)Na + H2O—>
ii)Zn + HCl—>
Zn + conc.H2SO4–>
iii)Zn + NaOH—>
iv)CaH2 + H2O—->

Answer 1

1)Laboratory preparation of H2:
i)Na + H2O—>NaOH + H2
ii)Zn + HCl—>ZnCl2 + H2
Zn + conc.H2SO4–>ZnSO4 + SO2
iii)Zn + NaOH—>Na2ZnO2 + H2
iv)CaH2 + H2O—->Ca(OH)2 + H2

Question 2

2)Industrial Preparation of H2:
i)2H2O–electrolysis in traces of acid–>
ii)electrolysis of brine solution
iii)production of syn gas rxn
iv)water gas shift rxn

Answer 2

2)Industrial Preparation of H2:
i)2H2O–electrolysis in traces of acid–>2H2 + O2
ii)electrolysis of brine solution
iii)CH4 + H2O–1270K and Ni->CO + H2
C(s) + H2O–1270K and Ni–>CO + H2
iv)CO + H2O–673K and FeCr2O3–>CO2 + H2

Question 3

what method is used for more than 99% pure H2

Answer 3

electrolysis of warm aqueous solution of Ba(OH)2 between Ni electrodes