A) Acidified \[KMn{{O}_{4}}\]
B) Acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
C) \[{{H}_{2}}S\]
D) Acidified \[{{C}_{2}}{{H}_{5}}OH\]
Correct Answer: C
Solution :
In \[KMn{{O}_{4}},\,{{K}_{2}}C{{r}_{2}}{{O}_{7}}\,\And \,{{C}_{2}}{{H}_{5}}OH\]\[Mn(+7)\,,\,\,Cr(+6),\,\,C(+4)\] are present in their max. oxidation state, so they cannot be further oxidised but in \[{{H}_{2}}S,\] S(-2) is present in its minimum oxidation state so it can be oxidised by \[S{{O}_{2}}\]
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