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Question

In an acidic medium, H2O2 changes K2Cr2O7 to CrO5. What is the oxidation state of Cr in CrO5?


A

2

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B

3

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C

5

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D

6

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Solution

The correct option is D

6


The Explanation for the correct answer

Option (D): 6

  • The balanced chemical equation will be: K2Cr2O7Potassiumpermanganate+H2SO4Sulphuricacid+4H2O2Hydrogenperoxide→2CrO5Chromiumperoxide+K2SO4Potassiumsulphate+5H2OWater
  • The structure of CrO5 has a double bond between Cr and O so Oxygen will have -2oxidation state here.
  • Rest 4 Oxygens are of peroxide so Oxygen will have -1 oxidation state.

Let the oxidation state of Cr in CrO5 be X.

⇒X+(-2)+4×(-1)=0

⇒X+(-2)+(-4)=0

⇒X+(-6)=0

⇒X=6

The oxidation state of Cr in CrO5 is +6.

Hence, Option D is correct.


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