Chemical Process
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is

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

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Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Increasing the oxygen concentration
Maintaining low temperature & pressure in the converter
Putting more quantity of V₂O₅ catalyst in the converter
Removing some quantity of SO₃ during intermediate stage

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