A) +5
B) +3
C) 4-6
D) -10
Correct Answer: C
Solution :
When \[{{H}_{2}}{{O}_{2}}\] is added to an acidified solution of a dichromate, \[C{{r}_{2}}O_{7}^{2-}\], a deep blue coloured complex, chromic peroxide, \[Cr{{O}_{5}}\] \[[or\,CrO\,{{({{O}_{2}})}_{2}}]\] is formed. \[C{{r}_{2}}O_{7}^{2-}+2{{H}^{+}}+4{{H}_{2}}{{O}_{2}}\xrightarrow{\,}\underset{Chromic\,peroxide}{\mathop{2CrO{{({{O}_{2}})}_{2}}}}\,+5{{H}_{2}}O\] 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 Cr peroxide normal \[x+(-1)4+(-2)=0\] \[x-6=0\] \[x=+6\]You need to login to perform this action.
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