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# Which of the following transition elements are used in the preparation of $NH_3$ by haber's process?

(1) Fe $\quad$ (2) FeCl$_3 \quad$ (3) FeSO$_4 \quad$ (4) MnO$_2$

The Haber process, also called the Haber–Bosch process, is the industrial implementation of the reaction of nitrogen gas and hydrogen gas. It is the main industrial procedure to produce ammonia
$\quad N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)$
Iron is used to increase the rate of reaction and to lower the temperature at which the reaction takes place.
edited Aug 4, 2014