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Home/ Chemistry/Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

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On: October 6, 2024 Posted in Chemistry, Education, Exam Comments: 0 Views: 223

Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

Question 121:

What is the oxidation state of carbon in acetylene (C2H2C2​H2​)?
A) 0
B) +1
C) -1
D) +2

Answer: C) -1

Explanation: Each carbon atom in acetylene has an oxidation state of -1.

Question 122:

Which ion is commonly produced in the oxidation of sulfur in the environment?
A) SO32−SO32−​
B) SO42−SO42−​
C) H2SH2​S
D) HS−HS−

Answer: B) SO42−SO42−​

Explanation: Sulfur is often oxidized to sulfate ions in environmental processes.

Question 123:

What happens to the oxidation state of magnesium when it reacts with oxygen to form magnesium oxide (MgOMgO)?
A) It decreases.
B) It increases.
C) It remains the same.
D) It is neutralized.

Answer: B) It increases.

Explanation: Magnesium is oxidized from 0 to +2 in magnesium oxide.

Question 124:

Which of the following compounds can act as a reducing agent?
A) H2OH2​O
B) O2O2​
C) NaNa
D) Cl2Cl2​

Answer: C) NaNa

Explanation: Sodium can lose electrons and act as a reducing agent.

Question 125:

What is the oxidation state of phosphorus in H3PO3H3​PO3​?
A) +3
B) +5
C) +2
D) 0

Answer: A) +3

Explanation: In phosphorous acid (H3PO3H3​PO3​), phosphorus has an oxidation state of +3.

Question 126:

In the reaction Cu2++2e−→CuCu2++2e−→Cu, what is happening to copper?
A) It is oxidized.
B) It is reduced.
C) It remains unchanged.
D) It is neutralized.

Answer: B) It is reduced.

Explanation: Copper ions gain electrons to form elemental copper, indicating reduction.

Question 127:

Which of the following statements about redox reactions is true?
A) Oxidation and reduction can occur independently of each other.
B) Electrons are always lost during reduction.
C) Oxidation always occurs with reduction.
D) Redox reactions do not involve any electron transfer.

Answer: C) Oxidation always occurs with reduction.

Explanation: In redox reactions, oxidation and reduction are coupled processes.

Question 128:

What is the oxidation state of sulfur in H2SH2​S?
A) +2
B) +4
C) -2
D) 0

Answer: C) -2

Explanation: In hydrogen sulfide, sulfur has an oxidation state of -2.

Question 129:

In the reaction C6H14+O2→CO2+H2OC6​H14​+O2​→CO2​+H2​O, what is being oxidized?
A) Oxygen
B) Carbon
C) Hydrogen
D) None of the above

Answer: B) Carbon

Explanation: Carbon in hydrocarbons is oxidized to form carbon dioxide.

Question 130:

Which of the following species is a strong reducing agent?
A) H2H2​
B) Cl−Cl−
C) F−F−
D) O2O2​

Answer: A) H2H2​

Explanation: Hydrogen gas can donate electrons, acting as a strong reducing agent.

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