Atomos Test Generator Free PYQs ExamsMy practice Log in / Sign up free

d- and f-Block Elements

JEE Main 2026 (Online) 21st January Evening ShiftMCQMedium📈 Topic in 14% papers+4−1
Ques. 1JEE Main 2026, 21 January (Evening Shift)

Given below are some of the statements about Mn and Mn2O7. Identify the correct statements. Choose the correct answer from the options given below :

  1. A, B, C and D
  2. A, B and D Only
  3. A, B and C Only
  4. A, C and D Only

Answer

(2) A, B and D Only

Solution

A. True. In Mn2O7: 2x + 7(-2) = 0 x = +7, the highest oxidation state of Mn (3d5 4s2, all 7 electrons used).

B. True. As per NCERT, the ability of oxygen to form multiple bonds to metals explains its superiority over fluorine in stabilising the highest oxidation state (Mn2O7 exists but the highest fluoride is MnF4).

C. False. Mn2O7 is a covalent green oil (an acidic oxide), not an ionic oxide.

D. True. Mn2O7 consists of two MnO4 tetrahedra sharing one corner, i.e. one Mn–O–Mn bridging oxygen.

Correct statements: A, B and D

Answer: (2)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2025, 8 April (Evening Shift)

The correct decreasing order of spin only magnetic moment values (BM) of Cu+, Cu2+, Cr2+ and Cr3+ ions is :

  1. Cr3+ > Cr2+ > Cu+ > Cu2+
  2. Cu+ > Cu2+ > Cr3+ > Cr2+
  3. Cr2+ > Cr3+ > Cu2+ > Cu+
  4. Cu2+ > Cu+ > Cr2+ > Cr3+
Ques. 3JEE Main 2025, 7 April (Morning Shift)

The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ions ( Mn+) exists in green colour. The nature of the oxide formed by the above Mn+ ion is:

  1. basic
  2. neutral
  3. amphoteric
  4. acidic
Ques. 4JEE Main 2025, 7 April (Morning Shift)

The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is :

  1. 10
  2. 6
  3. 9
  4. 8
Ques. 5JEE Main 2025, 7 April (Evening Shift)

'X' is the number of acidic oxides among VO2, V2O3, CrO3, V2O5 and Mn2O7. The primary valency of cobalt in [Co(H2NCH2CH2NH2)3]2(SO4)3 is Y. The value of X + Y is .

  1. 3
  2. 4
  3. 2
  4. 5
Ques. 6JEE Main 2025, 4 April (Morning Shift)

Pair of transition metal ions having the same number of unpaired electrons is

  1. Ti3+, Mn2+
  2. Ti2+, Co2+
  3. Fe3+, Cr2+
  4. V2+, Co2+
Ques. 7JEE Main 2025, 4 April (Morning Shift)

KMnO4 acts as an oxidising agent in acidic medium. 'X' is the difference between the oxidation states of Mn in reactant and product. 'Y' is the number of 'd' electrons present in the brown red precipitate formed at the end of the acetate ion test with neutral ferric chloride. The value of X + Y is .

Ques. 8JEE Main 2025, 4 April (Evening Shift)

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

  1. Mn2+ < Fe2+
  2. Mn+ < Mn2+
  3. Mn+ < Cr+
  4. Fe2+ < Fe3+
Ques. 9JEE Main 2025, 3 April (Morning Shift)

The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are : Choose the correct answer from the options given below:

  1. A, D and E Only
  2. A, B and E Only
  3. A, C and E Only
  4. B and E Only
Ques. 10JEE Main 2025, 3 April (Morning Shift)

Consider the following reactions A + Little amountNaCl + H2SO4 CrO2Cl2 + Side Products CrO2Cl2(Vapour) + NaOH B + NaCl + H2O B + H+ C + H2O The number of terminal 'O' present in the compound 'C' is

Ques. 11JEE Main 2025, 3 April (Evening Shift)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

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

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 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