Chemical Process
Thermoplastic materials

Do not soften on application of heat
Are heavily branched molecules
None of these
Are solvent insoluble

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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

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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