In the following reactions sequence  $\left(\mathrm{A}\right)+{\mathrm{N}}_2\stackrel{∆}{\to }\left(\mathrm{B}\right)\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }\left(\mathrm{C}\right)+\left(\mathrm{D}\right)$

White ppt. (C) is formed and gas (D) is evolved. White ppt. (C) dissolves in NaOH solution, while gas (D) gives white fumes in HCl. Thus, (A) is

• A

  B

• B

  Al

• C

  Ga

• D

  C