Chemical Process
Diaphragm electrolytic cell as compared to mercury electrolytic cell

All of these
Requires less specific power consumption for the production of chlorine
Requires lesser investment for similar capacity
Produces 70% NaOH solution

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

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

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