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Principles Related to Practical Chemistry

JEE Main 2025 (Online) 23rd January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning 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 false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false

Answer

(4) Statement I is true but Statement II is false

Solution

Concept: Lassaigne's test fuses the compound with Na, so covalent N, S, X become ionic NaCN, Na2S, NaX ⇒ Statement I true.

With N and S together: Na + C + N + S NaSCN, so no free CN- and no Prussian blue.

Fe3+ + SCN- [Fe(SCN)]2+ (blood-red) ⇒ Statement II false.

Answer: (4)

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Ques. 2JEE 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)

Ques. 3JEE 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. 4JEE 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. 5JEE 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