According to paragraph 1, how does hydrogen generally occur?

Câu hỏi :

According to paragraph 1, how does hydrogen generally occur?

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.

* Đáp án

B

* Hướng dẫn giải

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. 

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