Principles Related to Practical Chemistry

JEE Main 2025 (Online) 23rd January Evening ShiftMCQMedium📈 Topic in 32% papers+4−1

Ques. 1JEE Main 2025, 23 January (Evening Shift)

Identify A, B and C in the given below reaction sequence [figure]

PbCl2, PbSO4, PbCrO4
PbS, PbSO4, Pb(CH3COO)2
PbS, PbSO4, PbCrO4
PbCl2, Pb(SO4)2, PbCrO4

Answer

(3) PbS, PbSO4, PbCrO4

Solution

Confirmatory test for Pb2+ (A = galena):

[figure]

∴ A = PbS, B = PbSO4, C = PbCrO4

Answer: (3)

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

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is %. (Given : molar mass in g mol-1 of Ag:108, Cl:35.5)

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

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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