Chemical Process
High temperature carbonisation of coal produces

Larger quantity of tar compared to low temperature carbonisation
Inferior coke compared to low temperature carbonisation
Less of gases compared to liquid products
None of these

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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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