Chemical Process
Lime and soda ash are added to water to remove

Undersirable taste and odour
Bicarbonates & sulphates of calcium and magnesium
Bacteria
Its corrosiveness

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

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Chemical Process
Liquefaction of gases can not be done by

Exchange of heat with colder stream
Adiabatic expansion against a piston or in a turbine
Merely compressing it beyond critical pressure
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)

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