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Electrochemistry Practice Questions

Class 12 · Chemistry · 2264 free MCQs with instant results and detailed explanations.

2264
Total
724
Easy
1118
Medium
422
Hard

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Topics in Electrochemistry

Batteries and Corrosion 608
Conductivity 532
Electrochemical Cells 584
Nernst Equation 540

Sample Questions from Electrochemistry

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
In an electrochemical cell, what is the role of the anode?
A. It is the site of oxidation.
B. It is the site of reduction.
C. It is where electrons are consumed.
D. It generates the electric field.
Show Answer & Explanation
Correct Answer: A
The anode is defined as the electrode where oxidation occurs in an electrochemical cell, meaning it loses electrons.
Q2
Easy
In a galvanic cell, if the standard electrode potential of the cathode is +0.76 V and that of the anode is -0.44 V, what is the cell potential?
A. +1.20 V
B. -1.20 V
C. +0.32 V
D. -0.32 V
Show Answer & Explanation
Correct Answer: A
The cell potential (E°) can be calculated using the formula E°cell = E°cathode - E°anode, resulting in +1.20 V.
Q3
Easy
Which of the following statements about electrolytic cells is true?
A. They operate spontaneously.
B. They require an external energy source.
C. Oxidation occurs at the cathode.
D. They generate electrical energy.
Show Answer & Explanation
Correct Answer: B
Electrolytic cells require an external energy source to drive the non-spontaneous reactions.
Q4
Medium
In a Daniel cell, which reaction occurs at the anode?
A. Zn -> Zn²⁺ + 2e⁻
B. Cu²⁺ + 2e⁻ -> Cu
C. Zn²⁺ + 2e⁻ -> Zn
D. Cu -> Cu²⁺ + 2e⁻
Show Answer & Explanation
Correct Answer: A
At the anode of a Daniel cell, zinc is oxidized, losing electrons.
Q5
Medium
What is the standard electrode potential for the half-reaction: Cu²⁺ + 2e⁻ -> Cu?
A. +0.34 V
B. -0.76 V
C. +0.76 V
D. 0 V
Show Answer & Explanation
Correct Answer: A
The standard electrode potential for copper is +0.34 V, indicating its tendency to gain electrons.
Q6
Medium
In an electrolytic cell, what type of reaction occurs?
A. Spontaneous
B. Non-spontaneous
C. Both spontaneous and non-spontaneous
D. Neither spontaneous nor non-spontaneous
Show Answer & Explanation
Correct Answer: B
Electrolytic cells require an external voltage to drive non-spontaneous reactions.
Q7
Medium
Which of the following statements about a galvanic cell is true?
A. It converts chemical energy to electrical energy.
B. It requires an external power source.
C. It functions only in a vacuum.
D. Anode is positive.
Show Answer & Explanation
Correct Answer: A
A galvanic cell converts chemical energy from spontaneous reactions into electrical energy.
Q8
Hard
In an electrochemical cell, which of the following changes indicates that the cell is functioning properly?
A. Increase in temperature
B. Decrease in pH
C. Flow of current
D. Change in color
Show Answer & Explanation
Correct Answer: C
A functioning electrochemical cell produces a flow of current as a result of the redox reactions occurring within it.
Q9
Hard
If the standard reduction potential for Cu²⁺/Cu is +0.34 V and for Ag⁺/Ag is +0.80 V, which metal will displace the other in a solution?
A. Copper displaces Silver
B. Silver displaces Copper
C. No displacement occurs
D. Both metals displace each other
Show Answer & Explanation
Correct Answer: B
Since Ag has a higher reduction potential, it will displace Cu from its solution.
Q10
Hard
Which type of electrode is used in galvanic cells to maintain charge neutrality?
A. Reference electrode
B. Inert electrode
C. Salt bridge
D. Composite electrode
Show Answer & Explanation
Correct Answer: C
A salt bridge allows ions to flow between the two halves of the cell, maintaining charge neutrality.

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Electrochemistry — Class 12 Chemistry Practice Questions Online

This page contains 2264 practice MCQs for the chapter Electrochemistry in Class 12 Chemistry. The questions are organized by difficulty — 724 easy, 1118 medium, 422 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.