Electrochemistry

JEE Main 2025 (Online) 22nd January Morning ShiftMCQMedium📈 Topic in 8% papers+4−1

Ques. 1JEE Main 2025, 22 January (Morning Shift)

Which of the following electrolyte can be used to obtain H2S2O8 by the process of electrolysis ?

Concentrated solution of sulphuric acid
Dilute solution of sodium sulphate.
Acidified dilute solution of sodium sulphate.
Dilute solution of sulphuric acid

Answer

(1) Concentrated solution of sulphuric acid

Solution

Anode: 2HSO4- H2S2O8 + 2e-, cathode: 2H+ + 2e- H2

[figure]

HSO4- must be plentiful concentrated H2SO4; in dilute solutions water is oxidised to O2 instead.

Answer: (1)

Keep practising — Electrochemistry

Ques. 2JEE Main 2025, 22 January (Morning Shift)

A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A. The amount of the aluminium deposited at the cathode is . [Given : molar mass of aluminium and chlorine are 27 g mol-1 and 35.5 g mol-1 respectively. Faraday constant = 96500 C mol-1]

1.660 g
1.007 g
0.336 g
0.441 g

Ques. 3JEE Main 2025, 22 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is true but Statement II is false
Statement I is false but Statement II is true

All Electrochemistry PYQs →

PDFDownload Electrochemistry PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇

All JEE Main Chemistry chapters

Physical ChemistrySome Basic Concepts of Chemistry Structure of Atom States of Matter Thermodynamics Equilibrium Redox Reactions Solutions Electrochemistry Chemical Kinetics

Inorganic ChemistryClassification of Elements and Periodicity in Properties Chemical Bonding and Molecular Structure p-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block Elements Coordination Compounds

Organic ChemistryOrganic Chemistry – Some Basic Principles and Techniques Isomerism Hydrocarbons Haloalkanes and Haloarenes Alcohols, Phenols and Ethers Aldehydes, Ketones and Carboxylic Acids Amines Biomolecules Principles Related to Practical Chemistry