Which process is an oxidation?

A] 2 H + (aq) + CO32 - (aq) H2O (l) + CO2 (g)

B] Fe3 + (aq) Fe2 + (aq)

C] 2 CrO42 - (aq) + 2 H + (aq) Cr2O72 - (aq) + H2O (l)

D] Ba2 + (aq) + CrO42 - (aq) BaCrO4 (s)

E] MnO2 (s) MnO4 - (aq

Question

Chemistry

Dominguez

9 April, 23:21

Which process is an oxidation?

A] 2 H + (aq) + CO32 - (aq) H2O (l) + CO2 (g)

B] Fe3 + (aq) Fe2 + (aq)

C] 2 CrO42 - (aq) + 2 H + (aq) Cr2O72 - (aq) + H2O (l)

D] Ba2 + (aq) + CrO42 - (aq) BaCrO4 (s)

E] MnO2 (s) MnO4 - (aq

+2

Answers (1)

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Nyasia Carpenter · Answer 1

The problem has to do with oxidation states of the matter. The oxidation state of oxygen will always be - 2 with the exception of peroxides which will have a state of - 1. The overall balanced state of chemical compounds will be 0, so the oxidation state of Mn in MnO2 will be + 4. The oxidation state of MnO4 - will then be + 7 to balance out to the negative one charge. The state change from + 4 to + 7 is 3, thus three electrons have to be lost in order for this to happen; a loss of a charge of - 3 results in an increase of charge of 3. Oxidation is always the process of 'losing' electrons.

E] MnO2 (s) MnO4 - (aq

Which process is an oxidation?A] 2 H + (aq) + CO32 - (aq) H2O (l) + CO2 (g)B] Fe3 + (aq) Fe2 + (aq)C] 2 CrO42 - (aq) + 2 H + (aq) Cr2O72 - (aq) + H2O (l)D] Ba2 + (aq) + CrO42 - (aq) BaCrO4 (s)E] MnO2 (s) MnO4 - (aq

Which process is an oxidation?

A] 2 H + (aq) + CO32 - (aq) H2O (l) + CO2 (g)

B] Fe3 + (aq) Fe2 + (aq)

C] 2 CrO42 - (aq) + 2 H + (aq) Cr2O72 - (aq) + H2O (l)

D] Ba2 + (aq) + CrO42 - (aq) BaCrO4 (s)

E] MnO2 (s) MnO4 - (aq