What is the change in oxidation number o

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

What is the change in oxidation number of Cr when CrO₄^2- is acidified?

Options:

+4 to +6 (increase)

+3 to +7 (increase)

+6 to +6 (no change)

+5 to +3 (decrease)

Correct Answer:

+6 to +6 (no change)

Explanation:

2CrO₄^2- + 2H⁺ → Cr₂O₇^2- + H₂O

In CrO₄^2-and Cr₂O₇^2-, the oxidation state of Cr is +6.