April 22nd, 2004 is the 35th "Earth Day", and the theme set by China is "Be kind to the earth-scientific development". The following behaviors that do not conform to this theme are

Adopt "green chemistry" process to transform raw materials into required substances as much as possible.

B. a large number of underground water is exploited to meet the social demand for water.

C reduce or even eliminate the use of HCFCs that damage the atmospheric ozone layer.

D. save energy and improve energy utilization.

2. Aluminum nitride (AlN) has excellent properties such as high temperature resistance, impact resistance and good thermal conductivity, and is widely used in electronic industry, ceramic industry and other fields. Under certain conditions, aluminum nitride can be synthesized by the following reactions:

Al2O3 + N2 + 3C 2AlN + 3CO

The following statement is correct.

A. In the synthesis reaction of aluminum nitride, N2 is the reducing agent and Al2O3 is the oxidizing agent.

In the above reaction, N2 gets 3 moles of electrons for every 2 moles of AlN generated.

The valence of nitrogen in aluminum nitride is -3.

D. aluminum nitride crystals belong to molecular crystals.

That's all I know.