A) \[C{{r}^{3+}}+n{{H}_{2}}O\]
B) \[C{{r}^{+}}+n{{H}_{2}}O\]
C) \[C{{r}^{2+}}+n{{H}_{2}}O\]
D) \[C{{r}^{0}}+n{{H}_{2}}O\]
Correct Answer: A
Solution :
Potassium dichromate in acidic solution reacts with \[F{{e}^{2+}}\] gives \[C{{r}^{3+}}\] and water. \[6F{{e}^{2+}}+2C{{r}_{2}}O_{7}^{2-}14{{H}^{+}}\]\[\xrightarrow{{}}6F{{e}^{3+}}+2C{{r}^{3+}}+7{{H}_{2}}O\]
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