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: 227

Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

Question 11:

What is the oxidation state of chlorine in NaClO3NaClO3​?
A) +1
B) +3
C) +5
D) +7

Answer: B) +5

Explanation: In NaClO3NaClO3​, the oxidation state of chlorine can be calculated as follows: (+1)+x+3(−2)=0(+1)+x+3(−2)=0 leads to x=+5x=+5.

Question 12:

In the reaction Fe3++3e−→FeFe3++3e−→Fe, what is happening?
A) Oxidation
B) Reduction
C) Precipitation
D) Ionization

Answer: B) Reduction

Explanation: Iron (III) is gaining electrons to become elemental iron, which is a reduction process.

Question 13:

Which of the following compounds can act as a strong oxidizing agent?
A) H2OH2​O
B) KClKCl
C) KMnO4KMnO4​
D) NaClNaCl

Answer: C) KMnO4KMnO4​

Explanation: Potassium permanganate (KMnO4KMnO4​) is a well-known strong oxidizing agent.

Question 14:

In a galvanic cell, which electrode is the site of reduction?
A) Anode
B) Cathode
C) Salt bridge
D) None of the above

Answer: B) Cathode

Explanation: In a galvanic cell, reduction occurs at the cathode, while oxidation occurs at the anode.

Question 15:

What happens to the oxidation state of an element that is reduced?
A) It increases.
B) It decreases.
C) It remains the same.
D) It cannot be determined.

Answer: B) It decreases.

Explanation: Reduction involves the gain of electrons, which decreases the oxidation state of the element.

Question 16:

In the reaction 2Fe2O3+3C→4Fe+3CO22Fe2​O3​+3C→4Fe+3CO2​, what role does carbon play?
A) Oxidizing agent
B) Reducing agent
C) Catalyst
D) None of the above

Answer: B) Reducing agent

Explanation: Carbon is oxidized to carbon dioxide, thus it acts as a reducing agent by donating electrons to iron(III) oxide.

Question 17:

What is the oxidation state of nitrogen in NH3NH3​?
A) +1
B) -1
C) -3
D) 0

Answer: C) -3

Explanation: In ammonia (NH3NH3​), nitrogen has an oxidation state of -3.

Question 18:

Which of the following is an example of a disproportionation reaction?
A) 2H2+O2→2H2O2H2​+O2​→2H2​O
B) 2Cu+→Cu+Cu2+2Cu+→Cu+Cu2+
C) Zn+Cu2+→Zn2++CuZn+Cu2+→Zn2++Cu
D) Cl2+2Na→2NaClCl2​+2Na→2NaCl

Answer: B) 2Cu+→Cu+Cu2+2Cu+→Cu+Cu2+

Explanation: In this reaction, Cu+Cu+ is both oxidized and reduced, making it a disproportionation reaction.

Question 19:

What is the oxidation state of phosphorus in H3PO4H3​PO4​?
A) +3
B) +5
C) +1
D) +7

Answer: B) +5

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

Question 20:

Which of the following ions can act as an oxidizing agent?
A) Fe3+Fe3+
B) Na+Na+
C) Ca2+Ca2+
D) Li+Li+

Answer: A) Fe3+Fe3+

Explanation: Fe3+Fe3+ can gain electrons to be reduced to Fe2+Fe2+, making it an oxidizing agent.

Previous article
Next article

Leave a comment