Which of the following equations represents an oxidation-reduction reaction? a. H2--->2H b. 2O^ - - -->O2^2 - c. H2+Cl2 - -->2HCl d. HCl+NaBr - --> HBr+NaCl

Question

Chemistry

Josie

23 July, 13:33

Which of the following equations represents an oxidation-reduction reaction? a. H2--->2H b. 2O^ - - -->O2^2 - c. H2+Cl2 - -->2HCl d. HCl+NaBr - --> HBr+NaCl

+3

Answers (1)

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Gretta · Answer 1

Answer: c) H2 + Cl2 → 2HCl

Explanation:

a) is a wrong answer because it is a dissociation reaction that H2 dissociated to its H atoms and have the same oxidation state (0).

b) Also, a wrong choice that oxygen have the same oxidation state (-1).

c) is the right answer that the oxidation state is changed for both H and Cl, that H2 is oxidized and its oxidation state changed from 0 to + 1 (loss of electrons). On the other hand, Cl2 is reduced that its oxidation state changed from 0 to - 1 (gain of electrons). So, this reaction is considered as an oxidation-reduction reaction.

d) is a replacement reaction without changing the oxidation state or reactants and products so it is a wrong answer.