Sign Up

Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.

Have an account?

Sign In

Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.

Don't have account,

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Have an account?

You must login to ask a question.

Need An Account,

You must login to add post.

Need An Account,

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Search
Ask A Question
Home/ Chemistry/Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

love-insta : Question and Answer Sharing Platform. Latest Articles

On: October 6, 2024 Posted in Chemistry, Education, Exam Comments: 0 Views: 228

Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

Question 71:

In which of the following does chlorine have an oxidation state of +1?
A) Cl2Cl2​
B) HClOHClO
C) ClO2ClO2​
D) Cl2OCl2​O

Answer: B) HClOHClO

Explanation: In hypochlorous acid (HClOHClO), chlorine has an oxidation state of +1.

Question 72:

Which process is an example of a disproportionation reaction?
A) 2H2+O2→2H2O2H2​+O2​→2H2​O
B) 2Ag++Cu→2Ag+Cu2+2Ag++Cu→2Ag+Cu2+
C) 2H2O2→2H2O+O22H2​O2​→2H2​O+O2​
D) NaCl→Na++Cl−NaCl→Na++Cl−

Answer: C) 2H2O2→2H2O+O22H2​O2​→2H2​O+O2​

Explanation: In this reaction, oxygen in hydrogen peroxide is both oxidized and reduced.

Question 73:

What is the oxidation state of phosphorus in PCl5PCl5​?
A) +3
B) +5
C) 0
D) -5

Answer: B) +5

Explanation: In phosphorus pentachloride (PCl5PCl5​), phosphorus has an oxidation state of +5.

Question 74:

Which of the following reactions involves an increase in oxidation state?
A) Fe3++3e−→FeFe3++3e−→Fe
B) H2+2e−→2H−H2​+2e−→2H−
C) Ag++e−→AgAg++e−→Ag
D) Cu+2Ag+→2Ag+Cu2+Cu+2Ag+→2Ag+Cu2+

Answer: D) Cu+2Ag+→2Ag+Cu2+Cu+2Ag+→2Ag+Cu2+

Explanation: Copper is oxidized from 0 to +2, indicating an increase in oxidation state.

Question 75:

What is the oxidation state of nitrogen in N2O4N2​O4​?
A) +4
B) +2
C) 0
D) -2

Answer: A) +4

Explanation: In dinitrogen tetroxide (N2O4N2​O4​), the average oxidation state of nitrogen is +4.

Question 76:

In the electrochemical series, which of the following is a strong oxidizing agent?
A) LiLi
B) Ag+Ag+
C) F2F2​
D) NaNa

Answer: C) F2F2​

Explanation: Fluorine (F2F2​) is a very strong oxidizing agent due to its high electronegativity.

Question 77:

What is the role of Cl−Cl− in the reaction Cl2+2e−→2Cl−Cl2​+2e−→2Cl−?
A) Oxidizing agent
B) Reducing agent
C) Both oxidizing and reducing agent
D) None of the above

Answer: A) Oxidizing agent

Explanation: Cl−Cl− is formed by the reduction of Cl2Cl2​, making it an oxidizing agent.

Question 78:

In the reaction H2+F2→2HFH2​+F2​→2HF, which species is reduced?
A) H2H2​
B) F2F2​
C) HFHF
D) None of the above

Answer: B) F2F2​

Explanation: Fluorine is reduced as it gains electrons going from 0 in F2F2​ to -1 in HFHF.

Question 79:

Which of the following best describes a reducing agent?
A) A species that gains electrons.
B) A species that loses electrons.
C) A species that does not change oxidation state.
D) None of the above.

Answer: B) A species that loses electrons.

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

Question 80:

What is the oxidation state of iodine in ICl3ICl3​?
A) +1
B) +3
C) +5
D) +7

Answer: B) +3

Explanation: In iodine trichloride (ICl3ICl3​), iodine has an oxidation state of +3.

Previous article
Next article

Leave a comment