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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: 222

Chemistry MCQ with Answer and Explanation : Oxidation and Reduction.

Question 101:

What is the oxidation state of nitrogen in NO2NO2​?
A) +2
B) +4
C) 0
D) -2

Answer: B) +4

Explanation: In nitrogen dioxide (NO2NO2​), nitrogen has an oxidation state of +4.

Question 102:

Which of the following is a product of the oxidation of glucose in cellular respiration?
A) Oxygen
B) Carbon dioxide
C) Water
D) Both B and C

Answer: D) Both B and C

Explanation: The oxidation of glucose results in the production of carbon dioxide and water.

Question 103:

In the reaction 2FeCl3+Sn→2FeCl2+SnCl22FeCl3​+Sn→2FeCl2​+SnCl2​, which species is the reducing agent?
A) FeCl3FeCl3​
B) FeCl2FeCl2​
C) SnSn
D) SnCl2SnCl2​

Answer: C) SnSn

Explanation: Tin (Sn) is oxidized and donates electrons, acting as the reducing agent.

Question 104:

Which of the following statements is true about a reduction reaction?
A) It involves the loss of electrons.
B) It involves the gain of protons.
C) It involves the gain of electrons.
D) It results in an increase in oxidation state.

Answer: C) It involves the gain of electrons.

Explanation: Reduction is characterized by the gain of electrons.

Question 105:

What is the oxidation state of sulfur in SO2SO2​?
A) +2
B) +4
C) 0
D) -2

Answer: B) +4

Explanation: In sulfur dioxide (SO2SO2​), sulfur has an oxidation state of +4.

Question 106:

In a redox reaction, which statement is always true?
A) The same species is oxidized and reduced.
B) The total number of electrons lost equals the total number of electrons gained.
C) Only one species is involved.
D) All reactions are spontaneous.

Answer: B) The total number of electrons lost equals the total number of electrons gained.

Explanation: In a redox reaction, electron conservation is maintained.

Question 107:

What is the oxidation state of chromium in CrO3CrO3​?
A) +3
B) +6
C) +5
D) 0

Answer: B) +6

Explanation: In chromium trioxide (CrO3CrO3​), chromium has an oxidation state of +6.

Question 108:

In the reaction Zn+2HCl→ZnCl2+H2Zn+2HCl→ZnCl2​+H2​, what happens to zinc?
A) It is oxidized.
B) It is reduced.
C) It remains unchanged.
D) It is neutralized.

Answer: A) It is oxidized.

Explanation: Zinc is oxidized as it loses electrons to form Zn2+Zn2+.

Question 109:

Which of the following compounds is formed during the oxidation of SO2SO2​?
A) SO3SO3​
B) S8S8​
C) H2SO4H2​SO4​
D) Both A and C

Answer: D) Both A and C

Explanation: Sulfur dioxide can be oxidized to form both sulfur trioxide and sulfuric acid.

Question 110:

What is the oxidation state of lead in PbO2PbO2​?
A) +2
B) +4
C) 0
D) -2

Answer: B) +4

Explanation: In lead(IV) oxide (PbO2PbO2​), lead has an oxidation state of +4.

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