The blue colour is produced on adding H2

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

The blue colour is produced on adding H₂O₂ in acidified K₂Cr₂O₇ is due to formation of which of the following?

Options:

CrO₅

Cr₂O₃

CrO₄^2-

CrO₃

Correct Answer:

CrO₅

Explanation:

The reaction between $H_{2} O_{2}$ and acidified $K_{2} C r_{2} O_{7}$ can be given as:

K_{2} C r_{2} O_{7} + H_{2} S O_{4} + 4 H_{2} O_{2} ⟶ 2 C r O_{5} + K_{2} S O_{4} + 5 H_{2}

The blue color produced is due to the presence of

C r O_{5}