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

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Chemical Process
Pick out the false statement pertaining to water treatment.

Water with pH value less than 7, is acidic
Sodium sulphate or sodium carbonate do not cause hardness in water
The zeolite water softening process reduces the hardness of water by not more than 50%
Aeration of water is effective in CO₂ removal

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