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Principles Related to Practical Chemistry

JEE Main 2025 (Online) 23rd January Morning ShiftNumericalEasy📈 Topic in 66% papers+4
Ques. 1JEE Main 2025, 23 January (Morning Shift)

During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %. (Given molar mass in g mol-1 of Ba : 137, S : 32, O : 16)

Answer

40

Solution

Concept: Carius method: all S ends up as BaSO4 (233 g mol-1).

\% S= 32233 466160 100, and 466=2 233

\% S= 32 2160 100=40

Answer: 40

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Ques. 2JEE Main 2025, 23 January (Evening Shift)

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

  1. PbCl2, PbSO4, PbCrO4
  2. PbS, PbSO4, Pb(CH3COO)2
  3. PbS, PbSO4, PbCrO4
  4. PbCl2, Pb(SO4)2, PbCrO4
Ques. 3JEE 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. 4JEE 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 :

  1. Both Statement I and Statement II are false
  2. Statement I is true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are true

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All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structurep-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry