A) \[Z{{n}^{2+}}\]
B) \[M{{g}^{2+}}\]
C) \[S{{n}^{2+}}\]
D) \[A{{l}^{3+}}\]
Correct Answer: D
Solution :
[d] \[2Co{{(N{{O}_{3}})}_{2}}\xrightarrow{\Delta }2CoO+4N{{O}_{2}}+{{O}_{2}}\] \[A{{l}_{2}}{{O}_{3}}+CoO\to \underset{(Blue\,\,colored\,\,bead)}{\mathop{A{{l}_{2}}{{O}_{3}}.CoO}}\,\]
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