i) The normal diatomic hydrogen (H2) is passed through an electric arc, which separates it into atomic hydrogen (H).
ii) Standard electrode potential of aluminium is −1.66V, which is why it acts as a strong reducing agent.
iii) Finely divided palladium can be used as a catalyst and at room temperature it can absorb up to 900 times its own volume of hydrogen.
iv) 2C2H5OH+2Na→2C2H5ONa+H2