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Principles Related to Practical Chemistry

JEE Main 2024 (Online) 27th January Morning ShiftMCQMedium📈 Topic in 41% papers+4−1
Ques. 1JEE Main 2024, 27 January (Morning Shift)

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :

  1. Tetraanionic complex with coordination number six
  2. Neutral complex with coordination number four
  3. Dianionic complex with coordination number six
  4. Dianionic complex with coordination number four

Answer

(4) Dianionic complex with coordination number four

Solution

PbCrO4 + 4NaOH Na2[Pb(OH)4] + Na2CrO4

Lead goes into solution as [Pb(OH)4]2- (tetrahydroxidoplumbate(II))

∵ four OH- on Pb2+ ⇒ charge = +2 − 4 = −2 (dianionic), coordination number = 4

Answer: (4)

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Ques. 2JEE Main 2024, 27 January (Morning Shift)

NaCl reacts with conc. H2SO4 and K2Cr2O7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ;

  1. CrO2Cl2, Na2CrO4
  2. Na2CrO4, CrO2Cl2
  3. CrO2Cl2, KHSO4
  4. CrO2Cl2, Na2Cr2O7
Ques. 3JEE Main 2024, 27 January (Evening Shift)

The technique used for purification of steam volatile water immiscible substances is :

  1. Fractional distillation
  2. Distillation
  3. Fractional distillation under reduced pressure
  4. Steam distillation
Ques. 4JEE Main 2024, 27 January (Evening Shift)

Phenolic group can be identified by a positive:

  1. Tollen's test
  2. Phthalein dye test
  3. Carbylamine test
  4. Lucas test

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All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structures-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-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