A. It is freely available in nature.
B. It is contained in many compounds.
C. It is often found in pure form.
D. It is released during hydrogenation.
B
Dẫn chứng: Pure hydrogen seldom occurs naturally, but it exists in most organic compounds, that is, compounds that contain carbon, which account for a very large number of compounds.
Câu hỏi trên thuộc đề trắc nghiệm dưới đây !
Copyright © 2021 HOCTAP247