A) \[MN{{O}_{2}}/HCl\]
B) \[MN{{O}_{4}}/{{C}_{5}}{{H}_{5}}N\]
C) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}\]
D) \[C{{r}_{2}}{{O}_{3}}/2{{C}_{5}}{{H}_{5}}N\]
Correct Answer: D
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