Chemical Process
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is

Still in development stage (by employing fluidised bed technique)
All of these
A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
A slow reaction

ANSWER DOWNLOAD EXAMIANS APP