Fertiliser Technology
Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by

None of these
Absorption (using ethanolamine or pyragalloll solution)
Cryogenic operations (low temperature cooling)
Adsorption on palladium

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Fertiliser Technology
Ammonium nitrate is

Having about 40% N₂
Mixed with limestone powder to reduce its explosive nature before using it as a fertilizer
Not prone to explosive thermal decomposition
Not hygroscopic

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