Why is it necessary to remove CO when ammonia is obtained by Haber's process ?

Whty is it necessary to remove CO when ammonia is obtained by Haber process ?

Why is it necessary to remove CO when ammonia is obtained in Haber's process?

Give reason that why is it necessary to remove CO when ammonia is prepared by Haber's process?

In Haber's process, H_(2) is obtained by reacting methane with steam in presence of NiO as catalyst . The process is known as steam reforming . Why is it necessary to remove CO when NH_(3) is obtained by Haber's process ?

How ammonia is manufactured by Haber's process ?