A) \[Cr{{O}_{3}}\]
B) \[C{{r}_{2}}{{O}_{3}}\]
C) \[Cr{{O}_{5}}\]
D) \[CrO_{4}^{2-}\]
E) \[C{{r}_{2}}O_{7}^{2-}\]
Correct Answer: C
Solution :
Acidified potassium dichromate is oxidized to unstable blue chromium peroxide, which is soluble in ether and produces blue coloured solution. \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}+4{{H}_{2}}{{O}_{2}}\to \] \[\underset{blue\text{ }colour}{\mathop{2Cr{{O}_{5}}+}}\,{{K}_{2}}S{{O}_{4}}+5{{H}_{2}}O\]
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