TRB BT Assistant - Transition Elements and Their Compounds Question Bank with Options

1. What is the primary reason for the high density of transition metals?

A) Their large atomic radii.

B) Their strong metallic bonding and relatively large atomic masses.

C) Their low ionization energies.

D) Their tendency to form ionic compounds.

2. The compound HgS is:

A) Soluble in dilute acids

B) Insoluble in dilute acids but soluble in aqua regia

C) Soluble in water

D) Decomposed by light

3. Which of the following elements is NOT considered a transition element?

A) Fe

B) Cu

C) Zn

D) Mn

4. The oxidation state of Copper in Cu₂O is:

A) +1

B) +2

C) +3

D) 0

5. Which of the following is an example of a ferromagnetic material among transition metals?

A) Copper

B) Silver

C) Iron

D) Gold

6. The use of transition metals as catalysts is often due to:

A) Their high density.

B) Their low melting points.

C) The ability to provide surfaces for reactions and change oxidation states.

D) Their inert nature.

7. What is the characteristic color of a solution containing Ni²⁺ ions?

A) Red

B) Yellow

C) Green

D) Blue

8. Which of the following is NOT a property of transition elements?

A) They exhibit variable oxidation states.

B) They form colored compounds.

C) They are generally poor conductors of heat and electricity.

D) They can form complex ions.

9. The compound AgCl is:

A) Soluble in water

B) Insoluble in water

C) Slightly soluble in water

D) Decomposed by water

10. What is the electronic configuration of Manganese (Mn)?

A) [Ar] 3d⁵ 4s²

B) [Ar] 3d⁶ 4s¹

C) [Ar] 3d⁴ 4s³

D) [Ar] 3d⁷

11. Which transition metal ion is a component of hemoglobin and is responsible for oxygen transport?

A) Copper

B) Cobalt

C) Iron

D) Manganese

12. The ability of transition metals to form colored compounds is a consequence of:

A) Metallic bonding.

B) Ionic bonding.

C) The absorption and emission of light energy by unpaired electrons in d-orbitals.

D) The formation of alloys.

13. Which of the following compounds of Iron is green in color?

A) FeCl₃

B) Fe₂O₃

C) FeSO₄·7H₂O

D) Fe³⁺

14. What is the common name for the alloy of Copper and Zinc?

A) Bronze

B) Brass

C) Steel

D) Solder

15. The lanthanides and actinides are collectively known as:

A) Alkali metals

B) Alkaline earth metals

C) Inner transition metals

D) Halogens

16. Which of the following transition metals is used in making magnets?

A) Silver

B) Gold

C) Iron, Cobalt, Nickel

D) Platinum

17. What is the oxidation state of Vanadium in the vanadate ion, VO₄³⁻?

A) +3

B) +4

C) +5

D) +2

18. The compound K₂Cr₂O₇ is commonly used as:

A) A reducing agent

B) An oxidizing agent

C) A catalyst

D) A drying agent

19. Which of the following is a characteristic property of transition metal ions that leads to complex formation?

A) Their large size and low charge density.

B) Their small size and high charge density, and presence of vacant d-orbitals.

C) Their inertness and lack of variable oxidation states.

D) Their gaseous state at room temperature.

20. Which element is used in the production of stainless steel and has the symbol Cr?

A) Cobalt

B) Nickel

C) Chromium

D) Molybdenum

21. What is the electronic configuration of Copper (Cu)?

A) [Ar] 3d⁹ 4s²

B) [Ar] 3d¹⁰ 4s¹

C) [Ar] 3d⁸ 4s²

D) [Ar] 3d¹⁰ 4s⁰

22. The blue color of copper sulfate solution is due to the presence of which ion?

A) Cu⁺

B) Cu²⁺

C) SO₄²⁻

D) H₂O

23. Which of the following transition metals has the highest melting point?

A) Iron (Fe)

B) Cobalt (Co)

C) Nickel (Ni)

D) Tungsten (W)

24. The complex ion [Fe(CN)₆]⁴⁻ is:

A) Paramagnetic

B) Diamagnetic

C) Ferromagnetic

D) Antiferromagnetic

25. What is the oxidation state of Manganese in MnO₂?

A) +2

B) +3

C) +4

D) +6

26. Which transition metal compound is known for its use in photography as a light-sensitive salt?

A) Silver chloride (AgCl)

B) Copper(I) chloride (CuCl)

C) Iron(III) chloride (FeCl₃)

D) Nickel(II) chloride (NiCl₂)

27. The magnetic moment of an ion is calculated using the formula:

A) μ = √(n+2) Bohr magnetons

B) μ = √n(n+2) Bohr magnetons

C) μ = n Bohr magnetons

D) μ = n² Bohr magnetons

28. Which of the following is an ore of Iron?

A) Bauxite

B) Haematite

C) Carnallite

D) Cryolite

29. What is the characteristic property of transition metals that allows them to form interstitial compounds?

A) Their large atomic radii.

B) Their ability to form multiple oxidation states.

C) Their relatively small interstitial voids in their crystal lattices.

D) Their high electronegativity.

30. Which of the following is the most stable oxidation state of Cobalt (Co)?

A) +1

B) +2

C) +3

D) +4

31. The oxidation state of Manganese in KMnO₄ is:

A) +2

B) +4

C) +6

D) +7

32. Which metal forms the alloy 'Bronze' with Tin?

A) Iron

B) Copper

C) Nickel

D) Aluminum

33. The formation of colored ions in transition metals is due to:

A) Spin-orbit coupling.

B) Crystal field splitting of d-orbitals.

C) Jahn-Teller effect.

D) Ligand field theory.

34. Which of the following is an example of a coordination compound involving a transition metal?

A) NaCl

B) H₂O

C) [Co(NH₃)₆]Cl₃

D) CH₄

35. What is the electronic configuration of Vanadium (V)?

A) [Ar] 3d³ 4s²

B) [Ar] 3d⁴ 4s¹

C) [Ar] 3d⁵

D) [Ar] 3d² 4s³

36. Which transition metal is essential for oxygen transport in the blood?

A) Copper (Cu)

B) Iron (Fe)

C) Manganese (Mn)

D) Cobalt (Co)

37. The catalytic activity of transition metals is often attributed to:

A) Their high density.

B) The presence of vacant d-orbitals which can adsorb reactants.

C) Their low melting points.

D) Their inert chemical nature.

38. What is the common oxidation state of Copper in its compounds?

A) +1 and +3

B) +2 and +4

C) +1 and +2

D) +3 and +4

39. Which of the following is a strong oxidizing agent in acidic solution?

A) Fe²⁺

B) Mn²⁺

C) Cr³⁺

D) MnO₄⁻ (Permanganate ion)

40. The ability of transition metals to form alloys is primarily due to:

A) Their high melting points.

B) Their similar atomic sizes and crystal structures.

C) Their ability to form ionic compounds.

D) Their tendency to exhibit multiple oxidation states.

41. Which compound of Chromium is used as a yellow pigment in paints and ceramics?

A) Chromium(III) oxide (Cr₂O₃)

B) Potassium dichromate (K₂Cr₂O₇)

C) Lead chromate (PbCrO₄)

D) Chromium(VI) oxide (CrO₃)

42. What is the electronic configuration of Chromium (Cr)?

A) [Ar] 3d⁵ 4s¹

B) [Ar] 3d⁴ 4s²

C) [Ar] 3d⁶

D) [Ar] 3d³ 4s²

43. Which of the following is a characteristic property of transition metals regarding magnetism?

A) They are all diamagnetic.

B) They are all paramagnetic.

C) They exhibit variable magnetic properties due to unpaired electrons.

D) They are all ferromagnetic.

44. What is the primary reason for the colored nature of transition metal compounds?

A) The presence of lone pairs of electrons.

B) The absorption of visible light due to d-d transitions.

C) The high ionization energy of the metal ion.

D) The formation of ionic bonds.

45. Which transition metal exhibits the highest number of oxidation states?

A) Iron (Fe)

B) Manganese (Mn)

C) Chromium (Cr)

D) Vanadium (V)

46. The complex ion [Cu(NH₃)₄]²⁺ has what geometry and color?

A) Tetrahedral, yellow

B) Square planar, blue

C) Octahedral, green

D) Tetrahedral, blue

47. Which of the following is NOT a common oxidation state of Iron (Fe)?

A) +2

B) +3

C) +4

D) +1

48. Which transition metal ion is responsible for the characteristic blue color of the flame test for copper?

A) Cu⁺

B) Cu²⁺

C) Cu³⁺

D) Cu⁰

49. What is the electronic configuration of the element Scandium (Sc)?

A) [Ar] 3d¹ 4s²

B) [Ar] 3d² 4s¹

C) [Ar] 3d³

D) [Ar] 4s² 3d⁰

50. Which of the following is the defining characteristic of transition elements in the periodic table?

A) They have a completely filled d-subshell.

B) They have incompletely filled d-subshells in their elemental state or in common oxidation states.

C) They are all gases at room temperature.

D) They belong to Group 1 or 2 of the periodic table.

Transition Elements and Their Compounds - Question Bank