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Which of the following is an oxidation-reduction reaction? Fe2O3 + 3CO mc009-1.jpg 2Fe + 3CO2 CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4 2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4

User Midhun KM
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2 Answers

3 votes

Answer: it's A

Step-by-step explanation:

User Akhil Vangala
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8.7k points
6 votes

Answer:


Fe_(2)O_(3)+3CO\rightarrow 2Fe+3CO_(2) is an oxidation-reduction reaction.

Step-by-step explanation:

In an oxidation-reduction reaction, the oxidation number of some elements must change during reaction.


Fe_(2)O_(3)+3CO\rightarrow 2Fe+3CO_(2) represents an oxidation-reduction reaction.

oxidation number

Fe in
Fe_(2)O_(3) +3

Fe in Fe 0

C in CO +2

C in
CO_(2) +4

SO, oxidation number of Fe decreases during reaction. Hence
Fe_(2)O_(3) is being reduced. Also, oxidation number of C increases during reaction. Hence CO is being oxidized.

In all other given reactions, oxidation number of elements are not changed during reaction. Hence they are not oxidation-reduction reaction.

User Eduardo Almeida
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7.7k points
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