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Electrochemistry Questions

Practice 72 Electrochemistry questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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72
Total Questions
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6
Easy
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53
Medium
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13
Hard
Practice by Exam:Chemistry(69)CHEMISTRY(3)

About Electrochemistry — practice questions, PYQs & concepts

Electrochemistry is a frequently-tested topic on Chemistry, CHEMISTRY. ExamTest.live currently lists 72 Electrochemistry questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Electrochemistry weight in competitive exams

Across our Electrochemistry question bank, the largest sources are Chemistry (69) and CHEMISTRY (3). Click any exam chip above to drill down to that exam-specific question set.

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All Electrochemistry Questions(1–72 of 72)

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Q1mediummcqChemistryAIEEE2026
0% accuracy
For a spontaneous reaction the , equilibrium constant () and will be respectively:
Q2mediummcqChemistryAIEEE2026
0% accuracy
Aluminium oxide may be electrolysed at to furnish aluminium metal (Atomic mass ; ). The cathode reaction is:

To prepare of aluminium metal by this method would require:
Q3hardmcqChemistryAIEEE2026
0% accuracy
Calculate using the following molar conductances at infinite dilution at :
image
Q4hardmcqChemistryNEET 20192026
0% accuracy
For a cell involving one electron E
cell
∘
​
=0.59V at 298K, the equilibrium constant for the cell reaction is:
Q5mediummcqChemistryNEET 20192026
0% accuracy
For the cell reaction:
2Fe
3+
(aq)+2I
−
(aq)→2Fe
2+
(aq)+I
2
​
(aq)
E
Cell
∘
​
=0.24V at 298K. The standard Gibbs energy (Δ
r
​
G
∘
) of the cell reaction is:
Q6mediummcqChemistryNEET (UG) 20172026
0% accuracy
In the electrochemical cell , the emf is . When the concentrations are swapped (, ), the emf is . The relationship is:
Q7mediummcqChemistryAIEEE 20062026
0% accuracy
The molar conductivities and at infinite dilution in water at are and respectively. To calculate , the additional value required is:
Q8hardmcqChemistryAIEEE 20062026
0% accuracy
Given at : What is the value of for ? ()
Q9hardmcqChemistryAIEEE 20062026
0% accuracy
Resistance of a conductivity cell filled with a solution of an electrolyte is . The conductivity is . Resistance of the same cell when filled with of the same solution is . The molar conductivity of solution of the electrolyte will be:
Q10mediummcqChemistryAIEEE 20072026
0% accuracy
The equivalent conductances of two strong electrolytes at infinite dilution in at are given: What additional information is needed to calculate of acetic acid?
Q11mediummcqChemistryAIEEE 20072026
0% accuracy
The cell, , , was allowed to be completely discharged at . The relative concentration of to , , is:
Q12mediummcqChemistryIndian Competitive Exams2026
What is deposited on iron in the process of Galvanization?
Q13mediummcqChemistryJEE Main2026
Given: Based on the data given above, the strongest oxidising agent will be:
Q14mediummcqChemistryAIEEE 20122026
The standard reduction potentials for , , and are , and respectively. The reaction will be spontaneous when:
Q15mediummcqCHEMISTRYNEET 20192026
Limiting molar conductivity of () is equal to:
Q16hardmcqCHEMISTRYNEET 20192026
Limiting molar conductivities for and are respectively. From the data given above, it can be concluded that for will be:
Q17mediummcqChemistryNEET 2020 E12026
On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:
Q18mediummcqChemistryNEET 2020 E12026
The number of Faradays() required to produce of calcium from molten (Atomic mass of ) is:
Q19mediummcqChemistryNEET 20212026
The molar conductance of , and at infinite dilution are and respectively. The molar conductance of at infinite dilution is:
Q20mediummcqChemistryNEET 20212026
The molar conductivity of acetic acid is . What is the dissociation constant of acetic acid? [Given and ]
Q21hardmcqChemistryNEET 20222026
Given below are half cell reactions: Will the permanganate ion, , liberate from water in the presence of an acid?
Q22mediummcqChemistryNEET 20222026
At , the standard electrode potentials of and are and , respectively. On the basis of standard electrode potential, predict which of the following reaction cannot occur?
Q23hardmcqChemistryNEET 20222026
Find the emf of the cell: [Given that , at ]
Q24mediummcqChemistryNEET 20232026
The conductivity of centimolar solution of at is and the resistance of the cell containing the solution at is . The value of cell constant is:
Q25mediummcqChemistryNEET 20232026
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:Assertion A: In the equation , the value of depends on .Reason R: is an intensive property and is an extensive property.In the light of the above statements, choose the correct answer:
Q26mediummcqChemistryNEET (UG) 20242026
Match the following reduction processes with the number of Faradays required:
image
Q27mediummcqChemistryNEET (UG) 20242026
Mass of copper deposited by passing of current through copper sulfate solution for is:(Given: Molar mass of , )
Q28hardmcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
The reduction potential of hydrogen half cell will be negative if:
Q29mediummcqChemistryAIEEE2026
The Gibbs energy for the decomposition of at is as follows: The potential difference needed for electrolytic reduction of at is at least:
Q30mediummcqChemistryAIEEE 20092026
Given: , . The value of standard electrode potential for the change, will be:
Q31easymcqChemistryAIEEE 20042026
In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to:
Q32mediummcqChemistryAIEEE 20042026
Consider the following values: Under standard conditions the potential for the reaction: is:
Q33mediummcqChemistryAIEEE 20042026
The standard e.m.f. of a cell, involving one electron change is found to be at . The equilibrium constant of the reaction is ():
Q34mediummcqChemistryAIEEE 20042026
The limiting molar conductivities for and are and respectively. The for is:
Q35mediummcqChemistryAIEEE 20042026
In a cell that utilizes the reaction , the addition of to the cathode compartment will:
Q36mediummcqChemistryAIEEE 20092026
In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is . At standard Gibb’s energies of formation for , and are , and respectively. If standard enthalpy of combustion of methanol is , efficiency of the fuel cell will be:
Q37mediummcqChemistryAIEEE2026
Given and . The potential for the cell is:
Q38hardmcqChemistryNEET 20172026
In the electrochemical cell: , the emf of this Daniel cell is . When the concentration of is changed to and that of changed to , the emf changes to . Which of the following is the relationship between and ? (Given, )
Q39mediummcqCHEMISTRYNEET 20192026
The standard electrode potential () values of , , , and are , , , and respectively. The correct decreasing order of the reducing power of the metal is:
Q40hardmcqChemistryChemistry
0% accuracy
If the molar conductivity () of a solution of a monobasic weak acid is , its extent (degree) of dissociation will be[Assume and ]
Q41mediummcqChemistryChemistry
0% accuracy
The electrode potentials for and are and respectively. The value of will be:
Q42mediummcqChemistryChemistry
0% accuracy
Standard electrode potential for couple is and that for the couple is . These two couples in their standard state are connected to make a cell. The cell potential will be:
Q43mediummcqChemistryChemistry
0% accuracy
Standard electrode potential of three metals and are and respectively. The reducing power of these metals will be:
Q44hardmcqChemistryChemistry
Given:(i) , (ii) , Electrode potential, for the reaction, , will be:
Q45mediummcqChemistryChemistry
A solution contains , and ions. It was treated with iodine at . for and for . The favourable redox reaction is:
Q46mediummcqChemistryChemistry
For the reduction of silver ions with copper metal, the standard cell potential was found to be at . The value of standard Gibbs energy, will be ():
Q47easymcqChemistryChemistry
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:
Q48mediummcqChemistryChemistry
The equivalent conductance of solution of a weak monobasic acid is and at infinite dilution is . The dissociation constant of this acid is:
Q49mediummcqChemistryChemistry
is reduced by electrolysis. If of current is passed through molten for , what mass of aluminium is produced? (At. mass of )
Q50mediummcqChemistryChemistry
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because:
Q51easymcqChemistryChemistry
On the basis of the standard reduction potential values, the strongest oxidizing agent is (assuming common values for Iron complexes):
Q52hardmcqChemistryChemistry
Standard free energies of formation at are and for and pentane respectively. The value of for the pentane-oxygen fuel cell is:
Q53easymcqChemistryChemistry
Kohlrausch's law states that at:
Q54mediummcqChemistryChemistry
A hypothetical electrochemical cell is shown below .The emf measured is . The cell reaction is :
Q55mediummcqChemistryChemistry
If and , the standard emf of the reaction : will be :
Q56easymcqChemistryChemistry
Assertion : Galvanised iron does not rust.Reason : Zinc has a more negative electrode potential than iron.
Q57mediummcqChemistryChemistry
The chemical reaction, taking place in a galvanic cell is represented by the notation:
Q58mediummcqChemistryChemistry
The number of electrons delivered at the cathode during electrolysis by a current of in is (charge on electron ):
Q59mediummcqChemistryChemistry
The Gibbs energy for the decomposition of at is as follows:

The potential difference needed for the electrolytic reduction of aluminium oxide () at is at least:
Q60mediummcqChemistryChemistry
Molar conductivities () at infinite dilution of , and are , and respectively. for will be:
Q61mediummcqChemistryChemistry
Standard reduction potentials of the half reactions are given below: The strongest oxidising and reducing agents respectively are:
Q62mediummcqChemistryChemistry
Limiting molar conductivity of (i.e., ) is equal to:
Q63mediummcqChemistryChemistry
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of . The oxidation potential of the electrode would be:
Q64mediummcqChemistryChemistry
At , the molar conductance of a aqueous solution of ammonium hydroxide is and at infinite dilution its molar conductance is . The degree of ionisation of ammonium hydroxide at the same concentration and temperature is:
Q65mediummcqChemistryChemistry
A button cell used in watches functions as follows: Given: The cell potential is:
Q66mediummcqChemistryChemistry
When is oxidized, the quantity of electricity required to completely oxidize to is:
Q67mediummcqChemistryChemistry
The weight of silver (at. wt. ) displaced by a quantity of electricity which displaces of at STP will be:
Q68easymcqChemistryChemistry
Aqueous solution of which of the following compounds is the best conductor of electric current?
Q69hardmcqChemistryChemistry
The pressure of required to make the potential of – electrode zero in pure water at is:
Q70mediummcqChemistryChemistry
The molar conductivity of a solution of with electrolytic conductivity of at is:
Q71mediummcqChemistryChemistry
During the electrolysis of molten sodium chloride, the time required to produce of chlorine gas using a current of is:
Q72mediummcqChemistryChemistry
If the for a given reaction has a negative value, which of the following gives the correct relationships for the values of and ?

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