PYQSidePowered byPrepblink ExamsMy practice

d- and f-Block Elements

JEE Main 2025 (Online) 23rd January Evening ShiftMCQEasy📈 Topic in 18% papers+4−1
Ques. 1JEE Main 2025, 23 January (Evening Shift)

Consider the following reactions K2Cr2O7 [-H2O]KOH [A] [-H2O]H2SO4 [B] + K2SO4 The products [A] and [B], respectively are :

  1. K2Cr(OH)6 and Cr2O3
  2. K2CrO4 and Cr2O3
  3. K2CrO4 and K2Cr2O7
  4. K2CrO4 and CrO

Answer

(3) K2CrO4 and K2Cr2O7

Solution

CrO42- and Cr2O72- interconvert with pH; Cr stays +6:

[figure]

∴ [A] = K2CrO4, [B] = K2Cr2O7

Answer: (3)

Keep practising — d- and f-Block Elements

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

Lanthanoid ions with 4f7 configuration are : Choose the correct answer from the options given below :

  1. B and E only
  2. B and C only
  3. A and D only
  4. A and B only

All d- and f-Block Elements PYQs →

PDFDownload d- and f-Block Elements 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 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