Chemistry, 21.08.2019 15:20 krystalhurst97

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

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Answer from: labrandonanderson00

The correct answer is $Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$

Explanation:

Oxidation-reduction reactions are the reactions in which one compound gets oxidized and another compound gets reduced. These are called as redox reactions.

In oxidation reactions, the element looses its electrons and forms a positive ion. The oxidation state of the element increases in these reactions.

$X\rightarrow X^{n+}+ne^-$

In reduction reactions, the element gains electrons and forms a negative ion., The oxidation state of element gets reduced.

$X^{n+}+ne^-\rightarrow X$

For the given options:

Option 1:

The equation follows:

$Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$

Oxidation state of Iron on reactant side = +3

Oxidation state of iron on product side = 0

As, the oxidation state of iron is getting reduced. Therefore, it is undergoing reduction reaction.

Oxidation state of carbon on reactant side = +2

Oxidation state of carbon on product side = +4

As, the oxidation state of carbon is increasing. Therefore, it is undergoing oxidation reaction.

This equation is considered as a redox reaction.

Option 2:

The equation follows:

$CuSO_4+2NaOH\rightarrow Cu(OH)_2+Na_2SO_4$

The oxidation state of copper and sodium remains same on both the sides. Hence, it is not considered as a redox reaction.

Option 3:

The equation follows:

$2NaOH+H_2CO_3\rightarrow Na_2CO_3+2NaOH$

The oxidation state of sodium and carbon remains same on both the sides. Hence, it is not considered as a redox reaction.

Option 4:

The equation follows:

$Pb(NO_3)_2+Na_2SO_4\rightarrow 2NaNO_3+PbSO_4$

The oxidation state of lead and sodium remains same on both the sides. Hence, it is not considered as a redox reaction.

Therefore, the correct answer is $Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$

Answer from: Quest

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

hungary

66.9%

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

ans is no, the data set cannot be plotted as a single circle graph

Answer from: Quest

answer: mole of the gas

answer: mole of the gasexplanation:

answer: mole of the gasexplanation: this is because 1 mole of a gas is 22.4dm³, which is use in ideal gas

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Which of the following is an oxidation-reduction reaction? fe2o3 + 3co mc009-1.jpg 2fe + 3co2 cuso4...

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