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Chemistry - d and f Block Elements

Practise 67 COMEDK previous year questions on d and f Block Elements, compiled from papers spanning 2012 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty COMEDK tests.

d and f Block Elements has been asked in 13 of the 15 years of COMEDK papers analysed (2012–2026), with 67 questions in all. 40% of them were easy, 57% moderate and 3% tough. Most of its questions came from 2025, with 14 questions that year. In the last three years (2024–2026) it had 34 questions across 10 papers, about 3.4 per paper.

The chapter's 4 topics are not weighted equally: Properties of D-block elements (45 questions, 67%), Compounds of Transition Metals (16 questions, 24%), and F-Block elements (5 questions, 7%) have been asked the most. Properties of D-block elements has also led over the last five years, with 25 questions. F-Block elements has produced the most tough questions (1).

  1. 1The ion that has a spin only magnetic moment of 5.9 BM is:09 May, 2026 (S1)Properties of D-block elements
  2. 2Which one of the following species will impart colour to an aqueous solution?09 May, 2026 (S1)Properties of D-block elements
  3. 3The basic character of transition metal monoxides follows the order:09 May, 2026 (S1)Properties of D-block elements
  4. 4on heating with aqueous NaOH gives -------------------------09 May, 2026 (S1)Compounds of Transition Metals
  5. 5The statements given below contain an assertion and reason. Choose the correct option. Assertion (A) : Cr, Mo and W possess very high meltin09 May, 2026 (S1)Properties of D-block elements
  6. 6Pick out the correct option Assertion(A): Mercury is not considered as a transition element Reason (R): Mercury is a liquid09 May, 2026 (S2)Properties of D-block elements
  7. 7Which of the following does not correctly represent the order of the property indicated against it?09 May, 2026 (S2)Properties of D-block elements
  8. 8The element with the highest third ionisation enthalpy is:09 May, 2026 (S2)Properties of D-block elements
  9. 9The product and its colour when MnO is fused with KOH in presence of O :09 May, 2026 (S2)Compounds of Transition Metals
  10. 10Choose the correct ascending order of the second ionisation enthalpies of the given metals. A. B. C. D.25 May, 2025 (Shift)Properties of D-block elements
  11. 11In alkaline medium, is oxidised to ' X ' by . The oxidation state of iodine in ' X ' is:25 May, 2025 (Shift)Compounds of Transition Metals
  12. 12Match the ions given in Column I with their characteristic properties given in Column II. S.No. Column I S.No. Column II A P Stable in aqueo25 May, 2025 (Shift)Properties of D-block elements
  13. 13Two statements, one Assertion and the other Reason, are given. Choose the right option. Assertion: The Standard Electrode potential, is grea25 May, 2025 (Shift)Properties of D-block elements
  14. 14What is the spin only magnetic moment of the metal ion in and the oxidation number of Sulphur in the oxidised product ?10 May, 2025 (S1)Properties of D-block elements
  15. 15Match the metals in Column II with their characteristic properties given in Column I. \( {array}{|c|l|c|c|} & { Properties } & & { Metals } 10 May, 2025 (S1)Properties of D-block elements
  16. 16Choose the correct statement.10 May, 2025 (S1)Properties of D-block elements
  17. 17Which is the correct order of increasing number of unpaired electrons in the following ions?10 May, 2025 (S2)Properties of D-block elements
  18. 18Arrange the following ions in the decreasing order of total covalent double bonds formed by the transition metal(s) with oxygen. A. = chroma10 May, 2025 (S2)Compounds of Transition Metals
  19. 19The values for and Co are and +1.97 V respectively. For which of these metals, the change in oxidation state from +2 to +3 is the easiest?10 May, 2025 (S2)Properties of D-block elements
  20. 20Choose the statements which are incorrect in the case of Lanthanoids. A. is diamagnetic while is paramagnetic. B. The atomic size of the tra10 May, 2025 (S2)F-Block elements
  21. 21Larger number of oxidation states are exhibited by the actinoids than those of lanthanoids. The reason is:10 May, 2025 (S2)F-Block elements
  22. 22Choose the correct metal/ ion from the brackets which .......... A. has chemical reactivity similar to that of the first few members of the 10 May, 2025 (S3)F-Block elements
  23. 23Find the correct matches.10 May, 2025 (S3)Compounds of Transition Metals
  24. 24The metallic ions that have almost same spin only magnetic moment are : (i) (ii) (iii) (iv)2024 (Afternoon Shift)Properties of D-block elements
  25. 25Consider the following statements in respect of lanthanides, which of the statements are incorrect? (i) is least basic among the hydroxides 2024 (Afternoon Shift)F-Block elements
  26. 26The correct order of increasing melting point is2024 (Afternoon Shift)Properties of D-block elements
  27. 27An inorganic compound undergoes the following reactions: Z appears in the form of orange crystals and is used as an oxidising agent in acid 2024 (Evening Shift)Compounds of Transition Metals
  28. 28Identify the correct statement from the following.2024 (Evening Shift)Properties of D-block elements
  29. 29The Lanthanoid ion which would form coloured compounds is -------------. Atomic numbers:2024 (Evening Shift)F-Block elements
  30. 30Which of the following compounds on reaction with NaOH and gives yellow colour?2024 (Memory Based)Compounds of Transition Metals
  31. 31Choose the incorrect statement from the following2024 (Morning Shift)Properties of D-block elements
  32. 32Arrange the following ions in the increasing order of their values.2024 (Morning Shift)Properties of D-block elements
  33. 33Match the compounds given in Column I with their characteristic features listed in Column II No. Column I No. Column II A P Acidic in nature2024 (Morning Shift)Properties of D-block elements
  34. 34The permanganate ion in acid medium acts as an oxidant and gets converted to its lower oxidation state. What would be the spin only magnetic2024 (Morning Shift)Properties of D-block elements
  35. 35Match the following characteristics of transition metals given in Column I with the examples listed in Column II S.No. Characteristic proper2023 (Evening Shift)Properties of D-block elements
  36. 36Identify the incorrect statement.2023 (Evening Shift)Properties of D-block elements
  37. 37In neutral medium oxidises to _________2023 (Evening Shift)Compounds of Transition Metals
  38. 38In dilute alkaline solution changes to2023 (Memory Based)Compounds of Transition Metals
  39. 39Mohr's salt has the formula2023 (Morning Shift)Compounds of Transition Metals
  40. 40In dilute alkaline solution changes to2023 (Morning Shift)Compounds of Transition Metals
  41. 41A volatile compound is formed by carbon monoxide and2023 (Morning Shift)Carbonyl Compounds
  42. 42is purple while is colourless because2023 (Morning Shift)Properties of D-block elements
  43. 43An aqueous solution of on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, can be2021Compounds of Transition Metals
  44. 44In -transition series, which one has the least melting point?2021Properties of D-block elements
  45. 45The oxidation number of in which has the following structure, is2021Properties of D-block elements
  46. 46Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of2020Compounds of Transition Metals
  47. 47The electronic configuration of is2020Properties of D-block elements
  48. 48In the periodic table metals usually used as catalysts belong to2020Properties of D-block elements
  49. 49Formation of coloured solution is possible, when metal ion in the compound contains2020Properties of D-block elements
  50. 50Which of the following forms a colourless solution in aqueous medium? @@2020Properties of D-block elements

Frequently Asked Questions

1.How many questions are available for d and f Block Elements?

This chapter includes 67 questions compiled from COMEDK papers spanning 2012 to 2026.

2.Are these questions only from COMEDK, or from other exams too?

These are COMEDK questions specifically for the d and f Block Elements chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is d and f Block Elements an important chapter for COMEDK Chemistry?

d and f Block Elements has appeared in 13 of the 15 years of COMEDK papers covered here, with 67 questions across 22 papers - about 3 per paper it appears in.

4.What is the difficulty level of d and f Block Elements questions in COMEDK?

Of the 67 questions analysed for this chapter, 40% are easy, 57% moderate and 3% tough. 2025 had the most, with 14 questions.

5.Which topics in d and f Block Elements should I focus on?

These topics have carried the most weightage in d and f Block Elements:

  • Properties of D-block elements - 45 questions (67%)
  • Compounds of Transition Metals - 16 questions (24%)
  • F-Block elements - 5 questions (7%)
  • F-Block elements has produced the most tough questions (1).
6.Is d and f Block Elements's weightage in COMEDK going up or down?

Across all 22 papers analysed, d and f Block Elements has averaged about 3.0 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 3.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.