Chemical Process
Multistage catalytic converter is not used in the

Neither A nor B
Conversion of SO₂ to SO₃
Both A & B
NH₃ synthesis reaction

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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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