NEET · Chemistry · STD 11 - 7. Redox reactions
In acidic medium, \(H_2O_2\) changes \(Cr_2O_7^{2-}\) to \(CrO_5\) which has two \((-O-O-)\) bonds. Oxidation state of \(Cr\) in \(CrO_5\) is
- A \(+5\)
- B \(+3\)
- C \(+6\)
- D \({-10}\)
Answer & Solution
Correct Answer
(C) \(+6\)
Step-by-step Solution
Detailed explanation
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 \(C r O_{5}\left[o r C r O\left(O_{2}\right)_{2}\right]\) is formed. \(C r_{2} O_{7}^{2-}+2 H^{+}+4 H_{2} O_{2} \rightarrow\)\(\underbrace{2 C r O\left(O_{2}\right)_{2}}_{\text {Chromic peroxide }}+5 H_{2} O\) This deep blue coloured complex has the following structure
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