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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: 366

Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

Question 141:

Which of the following compounds can be oxidized by Ag+Ag+?
A) H2H2​
B) CH3OHCH3​OH
C) CuCu
D) NaNa

Answer: B) CH3OHCH3​OH

Explanation: Methanol can be oxidized to formaldehyde or further, and silver ions can participate in this reaction.

Question 142:

What is the oxidation state of manganese in KMnO4KMnO4​?
A) +4
B) +6
C) +7
D) +2

Answer: C) +7

Explanation: In potassium permanganate, manganese has an oxidation state of +7.

Question 143:

In the reaction Ca+Cl2→CaCl2Ca+Cl2​→CaCl2​, what is the oxidation state of calcium after the reaction?
A) 0
B) +2
C) -2
D) +1

Answer: B) +2

Explanation: Calcium is oxidized from 0 to +2 in calcium chloride.

Question 144:

What is the oxidation state of chromium in Cr2O72−Cr2​O72−​?
A) +3
B) +6
C) +4
D) +7

Answer: B) +6

Explanation: In the dichromate ion, chromium has an oxidation state of +6.

Question 145:

Which of the following elements can act as an oxidizing agent?
A) I−I−
B) O2O2​
C) H−H−
D) LiLi

Answer: B) O2O2​

Explanation: Molecular oxygen can accept electrons, making it an oxidizing agent.

Question 146:

What is the oxidation state of iodine in KIKI?
A) -1
B) +1
C) +2
D) +3

Answer: A) -1

Explanation: In potassium iodide, iodine has an oxidation state of -1.

Question 147:

In the reaction 2H2+O2→2H2O2H2​+O2​→2H2​O, what happens to the oxidation state of hydrogen?
A) It decreases.
B) It increases.
C) It remains the same.
D) It becomes zero.

Answer: C) It remains the same.

Explanation: The oxidation state of hydrogen remains +1 throughout the reaction.

Question 148:

What is the oxidation state of tin in SnCl2SnCl2​?
A) +2
B) +4
C) 0
D) -2

Answer: A) +2

Explanation: In tin(II) chloride, tin has an oxidation state of +2.

Question 149:

Which of the following represents a reduction reaction?
A) Zn→Zn2++2e−Zn→Zn2++2e−
B) Cu2++2e−→CuCu2++2e−→Cu
C) Na→Na++e−Na→Na++e−
D) None of the above

Answer: B) Cu2++2e−→CuCu2++2e−→Cu

Explanation: This reaction shows copper ions gaining electrons, indicating reduction.

Question 150:

In which of the following pairs of elements does one undergo oxidation and the other undergo reduction?
A) LiLi and ClCl
B) CC and H2H2​
C) FeFe and SS
D) All of the above

Answer: D) All of the above

Explanation: Each pair shows one element being oxidized and another being reduced.

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