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3 years ago

Which of the following is an oxidation-reduction reaction?

Chemistry

2 answers:

polet [3.4K]3 years ago

5 0

Answer: The correct answer is Option a.

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

For the given options:

Option A: $Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$

On reactant side:

Oxidation state of iron = +3

Oxidation state of carbon = +2

On product side:

Oxidation state of iron = 0

Oxidation state of carbon = +4

The oxidation state of iron reduces from +3 to 0, it is getting reduced. Thus, it is getting reduced and it undergoes reduction reaction. The oxidation state of carbon increases from +2 to +4. Thus, it is getting oxidized and it undergoes oxidation reaction.

Thus, it is considered as redox reaction.

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

The above reaction is double displacement reaction because here exchange of ions takes place.

Option C: $2NaOH+H_2CO_3\rightarrow Na_2CO_3+2H_2O$

The above reaction is a neutralization reaction because an acid reacts with base to produce salt and water.

Option D: $Pb(NO_3)2+Na_2SO_4\rightarrow 2NaNO_3+PbSO_4$

The above reaction is double displacement reaction because here exchange of ions takes place.

Hence, the correct answer is Option A.

likoan [24]3 years ago

3 0

A) Fe⁺³₂O₃ + 3C⁺²O -> 2Fe⁰ + 3C⁺⁴O₂

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What is an aqueous solution? What is an aqueous solution? An aqueous solution is a homogeneous mixture of a substance with water

mestny [16]

Answer:

The answer to your question is: first option.

Explanation:

What is an aqueous solution?

Aqueous solution is a solution which solvent is water and is homogeneous.

a) An aqueous solution is a homogeneous mixture of a substance with water. This is the correct definition of aqueous solution because it mentions the characteristics of this kind of solutions.

b) An aqueous solution is a dispersoid solution. This option is wrong, it is a homogeneous solution, and the description do not mention water.

c) An aqueous solution is a mixture of a liquid substances. Aqueous solution is a mixture but one of the components is water not a liquid substance.

d) An aqueous solution is a heterogeneous mixture of a substance with water. Aqueous solution is homogeneous not heterogeneous, this option is wrong.

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3 years ago

Which one is denser? question 2 options: the earth (a solid object) the sun, which is about 300,000 times more massive than the

tankabanditka [31]

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3 years ago

Express the van der Waals equation of state as a virial expansion in powers of 1/Vm and obtain expressions for B and C in terms

nirvana33 [79]

Answer:

$PV_{m} = RT[1 + (b-\frac{a}{RT})\frac{1}{V_{m} } + \frac{b^{2} }{V^{2} _{m} } + ...]$

B = b -a/RT

C = b^2

a = 1.263 atm*L^2/mol^2

b = 0.03464 L/mol

Explanation:

In the given question, we need to express the van der Waals equation of state as a virial expansion in powers of 1/Vm and obtain expressions for B and C in terms of the parameters a and b. Therefore:

Using the van deer Waals equation of state:

$P = \frac{RT}{V_{m}-b } - \frac{a}{V_{m} ^{2} }$