Metallurgical Engineering
GATE MT Electrochemistry PYQs
Build your understanding with focused practice from past exam papers.
How to practice Electrochemistry
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 14. Imported answers require independent review unless marked reviewed.
Question 55
Open questionMTNAT2 marksNeeds review
Consider the following cell reaction:
Mg + Cd
⇌ Mg
+ CdThe standard Gibbs free energy change for the reaction is _____ kJ (rounded off to an integer).
Given: Standard oxidation potentials for the reactions with respect to standard hydrogen electrode are:
Mg ⇌ Mg
+ 2e
E° = 2.37 VCd ⇌ Cd
+ 2e
E° = 0.403 VFaraday’s constant = 96500 C mol
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Open questionMTNAT2 marksNeeds review
Copper is being electrodeposited from a CuSO
bath onto a stainless steel cathode of total surface area of 2 m
in an electrolytic cell operated at a current density of 200 A m
with a current efficiency of 90%.The mass of copper deposited in 24 h is _____ kg (rounded off to two decimal places).
Given: Faraday’s constant = 96500 C mol
, atomic mass of copper = 63.5 g mol
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Open questionMTNAT2 marksNeeds review
The cupric ion (Cu
) concentration in the electrolyte (at 298
) required to make the potential of pure copper equal to 0.17
is ______
.
(Round off to two decimal places).Gas constant
Faraday’s constant
(of electrons)Standard reduction potential of Cu,
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Open questionMTNAT2 marksNeeds review
In an aqueous solution of Fe
ions with concentration of
M at 298 K and atmospheric pressure, the reduction potential of Fe in volt is __________ (round off to 2 decimal places).Given: Standard reduction potential,
Faraday’s constant, F = 96500 C per mole of electrons
Universal gas constant, R = 8.314
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Open questionMTNAT2 marksNeeds review
The emf of the cell
Au-Pb(liquid) | PbCl
-KCl(liquid) | Cl
(gas, 0.5 atm), C(graphite)is 1.2327 V at 873 K. Activity of Pb in the Au-Pb alloy is 0.72 and the activity of PbCl
in the electrolyte is 0.18. The standard Gibbs energy of formation of PbCl
(liquid) at 873 K is ______ kJ·mol
(round off to 1 decimal place).Given:
and
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Open questionMTNAT1 markNeeds review
If
V, the value of
(in J mol
) at 298 K is: __________ (round off to nearest integer).Given: F = 96500 C mol
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Open questionMTMCQ1 markNeeds review
Which one of the following processes is an example of an electrolytic cell?
Your answerChoose one option.
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Open questionMTMCQ2 marksNeeds review
A galvanic cell is formed by connecting Zn (
V) and Fe (
V) electrodes immersed in their respective ion solutions. The cell discharges spontaneously with a voltage of 0.5 V. The ratio of the concentration of [Fe
] to [Zn
] ions in the cell is of the order of:Given, R = 8.314 J·mol
·K
, F = 96500 C·mol
, T = 298 KYour answerChoose one option.
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Open questionMTMCQ2 marksNeeds review
Two equal and opposite point charges + Q and − Q are located as shown in the figure above. A surface integral,
is defined on surface
of a sphere of radius
as follows:
where
is the electric field, and
is the unit normal to the surface of integration. If
are in the ratio 1:2:5, use the Gauss divergence theorem to determine the ratio
. 
Your answerChoose one option.
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Open questionMTMCQ2 marksNeeds review
What is the voltage required to electrolytically refine impure copper of activity
(Raoultian standard state) to pure copper at 300 KGiven: Gas constant R = 8.314 J mol
K
, and Faraday’s constant F = 96500 C mol
.Your answerChoose one option.
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