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Question

Which of the following is/are oxidation reactions?


A

Hg2+ + 2e- Zn

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B

Zn2+ + 2e- → Zn

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C

Fe2+ → Fe3+ + e-

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D

MnO42- → MnO4- + e-

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Solution

The correct options are
C

Fe2+ → Fe3+ + e-


D

MnO42- → MnO4- + e-


Oxidation is a process in which an atom or a group of atoms taking part in a chemical reaction loses one or more electrons. For example:

Mg Mg2+ + 2e

In option (c) and (d), there is loss of electrons making it oxidation reaction where as option (a) and (b) clearly shows addition of electrons making it reduction reaction.


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