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Electrochemistry /
Quiz 1

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NCAT - Practice Test - Chemistry - Electrochemistry Quiz

Attempt 10 MCQs on NCAT - Practice Test - Chemistry - Electrochemistry | Quiz 1

1. What is the key characteristic of a redox reaction?

Electron transfer
Proton transfer
Neutron transfer
Ion transfer

2. What happens to oxidation number during oxidation?

Increase in oxidation number
Decrease in oxidation number
Gain of electrons
No change in oxidation number

3. What happens to oxidation number during reduction?

Decrease in oxidation number
Increase in oxidation number
Loss of electrons
No change

4. Identify the oxidizing and reducing agents in Zn + CuSO4 -> ZnSO4 + Cu.

Zn is oxidized, Cu2+ is reduced
Zn is reduced, Cu2+ is oxidized
Both are oxidized
Both are reduced

5. What is the oxidation number of O2?

Zero
Positive
Negative
Variable

6. What is the oxidation number of Cl-?

Equals its charge
Always zero
Always positive
Always negative

7. What are the oxidation numbers of H and O in water?

H = +1, O = -2
H = -1, O = +2
H = 0, O = 0
H = +2, O = -1

8. What is the oxidation number of oxygen in H2O2?

-1
-2
0
+1

9. Identify the redox change.

Fe is reduced, Sn is oxidized
Fe is oxidized, Sn is reduced
Both are reduced
Both are oxidized

10. What is the change in oxidation number of Mn in permanganate reduction?

+7 to +2
+7 to +4
+4 to +2
+2 to +7

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Instructions: Select one answer per question. After submitting, you will see your score, correct answers, and explanations.

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