If acidified Potassium Dichromate(VI) (K₂Cr₂O₇) acts as oxidizing agent, color changes from

Correct Answer is : orange to green

Correct Answer is : orange to green

Test Index

JAMB Chemistry 2019 Paper

Question : 26

Total: 80

_2

_2

_7

) acts as oxidizing agent, color changes from

Solution:

Concept:

An oxidizing agent is reduced during a reaction, and this reduction produces a visible color change.

Explanation:

Acidified potassium dichromate

\mathrm{K_2Cr_2O_7}

contains the orange dichromate ion

\mathrm{Cr_2O_7^{2-}}

When it acts as an oxidizing agent, the dichromate ion is reduced from the

+6

oxidation state to the

+3

oxidation state.

This forms the green chromium(III) ion

\mathrm{Cr^{3+}}

in solution.

Therefore, the color changes from orange to green.

Answer:

B. orange to green

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