Farahat Chapter 11 MCQ

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Electrochemistry

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<p>The standard reduction potentials are as follows:</p><p>MnO<sub>4</sub><sup>–</sup>+ 8H<sup>+</sup>+ 5e<sup>–</sup> → Mn<sup>2+</sup> + 4H<sub>2</sub>O E° = 1.51 V</p><p>Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup>+14H<sup>+</sup>+ 6e<sup>–</sup> → 2 Cr<sup>3+</sup> +7H<sub>2</sub>O E° = 1.33 V</p><p>What is the oxidation state of Cr in Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup>?</p><p>a. +6</p><p>b. –2</p><p>c. +12</p><p>d. –1</p><p>e. +7</p>

The standard reduction potentials are as follows:

MnO4–+ 8H++ 5e– → Mn2+ + 4H2O E° = 1.51 V

Cr2O72–+14H++ 6e– → 2 Cr3+ +7H2O E° = 1.33 V

What is the oxidation state of Cr in Cr2O72–?

a. +6

b. –2

c. +12

d. –1

e. +7

a. +6

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