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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: 369

Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

Question 111:

Which ion is commonly used as a reducing agent in organic reactions?
A) Li+Li+
B) Na+Na+
C) H2H2​
D) Cl−Cl−

Answer: C) H2H2​

Explanation: Hydrogen gas can act as a reducing agent in many organic reactions.

Question 112:

What is the oxidation state of iron in Fe3O4Fe3​O4​?
A) +2
B) +3
C) +4
D) +6

Answer: B) +3

Explanation: In magnetite (Fe3O4Fe3​O4​), the average oxidation state of iron is +3.

Question 113:

In the reaction 2H2O2→2H2O+O22H2​O2​→2H2​O+O2​, what happens to the oxidation state of oxygen?
A) It increases.
B) It decreases.
C) It remains the same.
D) It changes to zero.

Answer: A) It increases.

Explanation: In this reaction, oxygen in H2O2H2​O2​ is oxidized from -1 to 0 in O2O2​.

Question 114:

What is the oxidation state of the central atom in H3PO4H3​PO4​?
A) +1
B) +3
C) +5
D) 0

Answer: C) +5

Explanation: In phosphoric acid (H3PO4H3​PO4​), phosphorus has an oxidation state of +5.

Question 115:

Which of the following reactions does not involve a change in oxidation states?
A) Zn+2Ag+→2Ag+Zn2+Zn+2Ag+→2Ag+Zn2+
B) 2H2+O2→2H2O2H2​+O2​→2H2​O
C) C+O2→CO2C+O2​→CO2​
D) CaCO3→CaO+CO2CaCO3​→CaO+CO2​

Answer: D) CaCO3→CaO+CO2CaCO3​→CaO+CO2​

Explanation: This reaction involves no change in oxidation states of calcium or carbon.

Question 116:

In the reaction 4HCl+MnO4−+2H2O→Cl2+MnCl2+4H2O4HCl+MnO4−​+2H2​O→Cl2​+MnCl2​+4H2​O, what happens to manganese?
A) It is oxidized.
B) It is reduced.
C) It remains unchanged.
D) It is neutralized.

Answer: B) It is reduced.

Explanation: Manganese is reduced from +7 in MnO4−MnO4−​ to +2 in MnCl2MnCl2​.

Question 117:

What is the oxidation state of phosphorus in P4O10P4​O10​?
A) +5
B) +3
C) +4
D) 0

Answer: A) +5

Explanation: In tetraphosphorus decoxide (P4O10P4​O10​), phosphorus has an oxidation state of +5.

Question 118:

In a redox reaction, which component is responsible for providing electrons?
A) Reducing agent
B) Oxidizing agent
C) Both agents
D) Neither

Answer: A) Reducing agent

Explanation: The reducing agent donates electrons and is oxidized in the process.

Question 119:

What is the oxidation state of chlorine in sodium hypochlorite (NaClONaClO)?
A) +1
B) +3
C) +5
D) -1

Answer: A) +1

Explanation: In sodium hypochlorite, chlorine has an oxidation state of +1.

Question 120:

Which of the following metals cannot be oxidized by Cu2+Cu2+?
A) ZnZn
B) AgAg
C) AuAu
D) FeFe

Answer: C) AuAu

Explanation: Gold is less reactive and cannot be oxidized by Cu2+Cu2+.

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