Chemical Process
Triple superphosphate is manufactured by reacting

Phosphate rock with sulphuric acid
Ammonium phosphate with phosphoric acid
Phosphate rock with nitric acid
Phosphate rock with phosphoric acid

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

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