How is ammonia manufactured industrially?

Options

A. `2NH_4 Cl + Ca(OH)_2 to CaCl_2 + 2H_2 O + 2NH_3`
B. By passing an electric discharge in a mixture of `N_2` and `H_2`
C. By reducing the by product nitric acid
D. By passing a mixture of `N_2` and `H_2` under high pressure and moderate temperature over a catalyst

Answer

D

Explanation

By passing a mixture of `N_2` and `H_2` under high pressure and moderate temperature over a catalyst