In the reaction,Cr2O7 + 14 H+- 2 Cr3++7H2OHow many electrons are gained or lost by chromium atom?

MCQS

FMDC 2023

Q-105

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In the reaction,Cr2O7 + 14 H+-> 2 Cr3++7H2OHow many electrons are gained or lost by chromium atom?

Chemistry

Miscellaneous

Question 105 of 200

Multiple Choice

+12 e

8.51%

Explanation:

In this reaction, each Cr atom goes from a +6 oxidation state (in Cr2O72-) to a +3 oxidation state (in Cr3+). This corresponds to a gain of 12 electrons by each Cr atom.

+3 e-

43.19%

Explanation:

In this reaction, each Cr atom goes from a +6 oxidation state (in Cr2O7-2) to a +3 oxidation state (in Cr3+). This corresponds to a gain of 3 electrons by each Cr atom.

+6 e

31.57%

Explanation:

In this reaction, each Cr atom goes from a +6 oxidation state (in Cr2O72-) to a +3 oxidation state (in Cr3+). This corresponds to a gain of 3 electrons by each Cr atom.

-6 e-

16.73%

Explanation:

In this reaction, each Cr atom goes from a +6 oxidation state (in Cr2O72-) to a +3 oxidation state (in Cr3+). This corresponds to a gain of 12 electrons by each Cr atom.

Explanation

In this reaction, each Cr atom goes from a +6 oxidation state (in Cr2O72-) to a +3 oxidation state (in Cr3+). This corresponds to a gain of 3 electrons by each Cr atom.