Fertiliser Technology
Iron is not used alone as a catalyst in ammonia synthesis, because

It decomposes ammonia
Its activity declines rapidly, if heated to above 520°C
None of these
It gets oxidised above 500°C

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Fertiliser Technology
I argest capacity nitrogenous fertiliser plants (2700 tons of NH₃ per day) (2 Nos) in India are located at

Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat)
Korba (M.P.) and Talchar (Orissa) both under FCI
Talchar (Orissa) and Ramagundam (A.P.) both under FCI
Haldia (W.B) and Namrup (Assam) both under HFC

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