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

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

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Chemical Process
Reverse osmosis is normally used for the

Separation of helium from natural gas
Purification of oxygen
Desalination of brackish water to produce potable (drinking) water
Separation of isotopes of uranium from gaseous uranium hexaflouride

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