A) \[+5\]
B) \[+3\]
C) \[+6\]
D) \[-10\]
Correct Answer: C
Solution :
When \[{{H}_{2}}{{O}_{2}}\] in added to an acidified solution of a dichromate, \[C{{r}_{2}}O_{7}^{2-}\], a deep blue coloured complex, chromic peroxide, \[Ca{{O}_{3}}\left[ or\,CrO{{\left( {{O}_{2}} \right)}_{2}} \right]\] is formed. |
\[C{{r}_{2}}O_{7}^{2-}+2{{H}^{+}}+4{{H}_{2}}{{O}_{2}}\xrightarrow{{}}\] \[\underset{Chromic\,\,peroxide}{\mathop{2CrO{{\left( {{O}_{2}} \right)}_{2}}}}\,+5{{H}_{2}}O\] |
This deep blue coloured complex has the following structure. |
Oxidation state of \[Cr\]is \[+6\] due to the presence of two peroxide linkages, which can be calculated as In \[CrO{{\left( {{O}_{2}} \right)}_{2}}\], let the oxidation state of \[Cr\]be x. |
\[x+(-1)4+(-2)=0\] |
\[x-6=0\] |
\[x=+6\] |
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