A) \[Zn\]
B) \[Fe\]
C) \[Al\]
D) \[Cu\]
Correct Answer: C
Solution :
Ammonium dichromate on heating gives green coloured powder of \[C{{r}_{2}}{{O}_{3}}.\] \[2{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }2{{(N{{H}_{4}})}_{2}}Cr{{O}_{4}}\] \[+\underset{\begin{smallmatrix} \text{chromic} \\ \,\,\,\,\,\text{oxide} \end{smallmatrix}}{\mathop{\,C{{r}_{2}}{{O}_{3}}}}\,+3{{O}_{2}}\]
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