Which of the following substance s contain different kind of elements?
A) Oxygen
B) Graphite
C) Hydrogen
D) Ammonia

Dear Student, Ammonia contains different types of elements. The elements present in Ammonia is Nitrogen and Hydrogen. Whereas Oxygen and Hydrogen are elements and Graphite is an allotrope of Carbon. So, Option (D) is correct. .... Hope it helps. Regards.