A) \[CrC{{O}_{3}}\]
B) \[C{{r}_{2}}{{O}_{3}}\]
C) \[Cr{{O}_{5}}\]
D) \[CrO_{4}^{2-}\]
Correct Answer: C
Solution :
\[{{H}_{2}}{{O}_{2}}\]oxidises the acidified potassium dichromate solution into blue peroxide of chromium,\[Cr{{O}_{5}}\]. \[CrO_{7}^{2-}+2{{H}^{+}}+4{{H}_{2}}{{O}_{2}}\xrightarrow{{}}2Cr{{O}_{5}}+5{{H}_{2}}O\]
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