Redox Reactions and Electrochemistry Practice Questions
JEE · Chemistry · 1208 free MCQs with instant results and detailed explanations.
1208
Total
260
Easy
542
Medium
406
Hard
Start Practicing Redox Reactions and Electrochemistry
Take a timed quiz or customize your practice session
Topics in Redox Reactions and Electrochemistry
Oxidation Number
Balancing Redox Equations
120
Electrolytic and Galvanic Cells
173
Nernst Equation
158
Conductance
131
Kohlrausch's Law
156
Faraday's Laws
108
Corrosion
169
Batteries
193
Sample Questions from Redox Reactions and Electrochemistry
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following represents a galvanic cell?
A.
Zn | Zn²⁺ || Cu²⁺ | Cu
B.
Cu²⁺ + 2e⁻ → Cu
C.
2H₂O → 2H₂ + O₂
D.
2Na + Cl₂ → 2NaCl
Show Answer & Explanation
Correct Answer: A
A galvanic cell converts chemical energy to electrical energy, exemplified by the reaction between zinc and copper ions.
Q2
Easy
What is the purpose of a salt bridge in an electrochemical cell?
A.
To allow ions to flow
B.
To separate the electrodes
C.
To provide a reaction medium
D.
To increase temperature
Show Answer & Explanation
Correct Answer: A
The salt bridge allows ions to flow between the two half-cells, maintaining electrical neutrality.
Q3
Easy
In an electrolytic cell, what is the role of the anode?
A.
Oxidation occurs
B.
Reduction occurs
C.
It consumes electricity
D.
It produces heat
Show Answer & Explanation
Correct Answer: A
In an electrolytic cell, oxidation occurs at the anode, where electrons are released.
Q4
Medium
In an acidic solution, the half-reaction for the reduction of permanganate ion (MnO4-) to manganese ion (Mn2+) is balanced by adding which of the following?
A.
H+ ions and electrons
B.
H2O and electrons
C.
OH- ions and electrons
D.
Electrons only
Show Answer & Explanation
Correct Answer: A
In acidic solutions, adding H+ ions balances the charge and helps balance the oxygen atoms from H2O.
Q5
Medium
If the redox reaction of zinc and copper sulfate is Zn + CuSO4 → ZnSO4 + Cu, what is the oxidation state change of zinc?
A.
From 0 to +2
B.
From +2 to 0
C.
From +2 to +1
D.
No change
Show Answer & Explanation
Correct Answer: A
Zinc starts with an oxidation state of 0 in elemental form and goes to +2 in ZnSO4.
Q6
Medium
Balance the following redox reaction in basic medium: Cl2 + OH- → ClO- + Cl-. What is the coefficient of OH- in the balanced equation?
A.
2
B.
1
C.
4
D.
3
Show Answer & Explanation
Correct Answer: A
In basic medium, OH- is used to balance the charges and the Cl species, resulting in 2 OH- for balance.
Q7
Medium
What is the correct balanced equation for the redox reaction between chromium (VI) ion and tin in acidic medium?
A.
Cr2O7^2- + 3 Sn → 2 Cr^3+ + 3 Sn^2+
B.
Cr2O7^2- + 6 H+ + 3 Sn → 2 Cr^3+ + 3 Sn^4+ + 3 H2O
C.
Cr2O7^2- + 4 H+ + 3 Sn → 2 Cr^3+ + 3 Sn^2+ + 2 H2O
D.
Cr2O7^2- + 8 H+ + 3 Sn → 2 Cr^3+ + 3 Sn^2+ + 4 H2O
Show Answer & Explanation
Correct Answer: C
In acidic medium, Cr(VI) is reduced to Cr(III) while Sn is oxidized, balancing H+ and H2O appropriately.
Q8
Hard
Which of the following reactions is correctly balanced in terms of both mass and charge?
A.
MnO4- + 8H+ + 5e- → Mn2+ + 4H2O
B.
Cr2O7^2- + 14H+ + 6e- → 2Cr^3+ + 7H2O
C.
Fe^3+ + 3e- → Fe
D.
Cu^2+ + 2e- → Cu
Show Answer & Explanation
Correct Answer: B
The reaction with Cr2O7^2- is balanced as it has equal numbers of atoms and charge on both sides.
Q9
Hard
Identify the correct half-reaction for the oxidation of sulfur in H2S to SO2.
A.
H2S → SO2 + 2H+ + 2e-
B.
H2S + 2e- → SO2 + 2H+
C.
2H2S → 2SO2 + 4H+ + 2e-
D.
H2S → SO2 + 2H+
Show Answer & Explanation
Correct Answer: A
The half-reaction correctly shows the loss of electrons (oxidation) and balancing of sulfur and hydrogen.
Q10
Hard
In an acidic medium, which species is reduced in the following reaction: Cr2O7^2- + 14H+ + 6e- → 2Cr^3+ + 7H2O?
A.
Cr^3+
B.
Cr2O7^2-
C.
H+
D.
H2O
Show Answer & Explanation
Correct Answer: B
Cr2O7^2- gains electrons (is reduced) to form Cr^3+ in the balanced equation.
Showing 10 of 1208 questions. Start a quiz to practice all questions with scoring and timer.
Practice All 1208 Questions →More Chemistry Chapters
1
Atomic Structure
1549 Qs →
2
Chemical Bonding
1435 Qs →
3
Chemical and Ionic Equilibrium
1166 Qs →
4
Thermodynamics and Thermochemistry
1545 Qs →
5
Organic Chemistry
1437 Qs →
6
Coordination Chemistry
1435 Qs →
7
Some Basic Concepts of Chemistry
1581 Qs →
8
Chemical Bonding and Molecular Structure
1424 Qs →
Other JEE Subjects
Redox Reactions and Electrochemistry — JEE Chemistry Practice Questions Online
This page contains 1208 practice MCQs for the chapter Redox Reactions and Electrochemistry in JEE Chemistry. The questions are organized by difficulty — 260 easy, 542 medium, 406 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 9 topics, giving you comprehensive coverage of the entire chapter.