First-row transition elements properties oxidation states catalytic and magnetic behaviour - Question Bank

1. The property that is NOT exhibited by Zinc (Zn), Cadmium (Cd), and Mercury (Hg) as compared to other transition elements is:
A) Variable oxidation states
B) Formation of coloured compounds
C) Catalytic activity
D) Magnetic behaviour
2. The oxidation state of nickel in Ni(CO)₄ is:
A) 0
B) +1
C) +2
D) -1
3. Which element in the first-row transition series has the lowest ionization enthalpy for the first electron removal?
A) Scandium (Sc)
B) Titanium (Ti)
C) Vanadium (V)
D) Chromium (Cr)
4. The electronic configuration of Mn²⁺ is:
A) [Ar] 3d⁵
B) [Ar] 3d³ 4s²
C) [Ar] 3d⁵ 4s²
D) [Ar] 3d⁴ 4s¹
5. Which of the following properties of transition metals is NOT explained by the presence of unpaired electrons in d-orbitals?
A) Coloured compounds
B) Paramagnetism
C) Catalytic activity
D) Formation of interstitial compounds
6. The highest oxidation state of Vanadium is:
A) +3
B) +4
C) +5
D) +2
7. Which of the following metals is used as a catalyst in the hydrogenation of oils?
A) Iron
B) Copper
C) Nickel
D) Zinc
8. The compound responsible for the blue colour of the sky is not directly related to transition metals, but its colour perception is affected by light scattering. Which of the following transition metal compounds is known for its blue colour?
A) Fe₂O₃
B) NiO
C) CuSO₄
D) Cr₂O₃
9. The oxidation state of cobalt in Vitamin B₁₂ is typically:
A) +1
B) +2
C) +3
D) +4
10. Which of the following transition metal ions is diamagnetic?
A) Cr³⁺
B) Mn²⁺
C) Fe³⁺
D) Zn²⁺
11. The element with electronic configuration [Ar] 3d¹⁰ 4s² is:
A) Copper (Cu)
B) Zinc (Zn)
C) Gallium (Ga)
D) Germanium (Ge)
12. Which of the following factors contributes to the catalytic activity of transition metals?
A) Presence of unpaired electrons.
B) Variable oxidation states.
C) Ability to form intermediate complexes.
D) All of the above.
13. The oxidation state of titanium in TiCl₄ is:
A) +1
B) +2
C) +3
D) +4
14. Which of the following transition metals has the highest density?
A) Iron (Fe)
B) Cobalt (Co)
C) Nickel (Ni)
D) Osmium (Os) is actually the highest, but among the first row options...
15. The colour of CuSO₄·5H₂O is due to the presence of hydrated:
A) Cu⁺ ion
B) Cu²⁺ ion
C) SO₄²⁻ ion
D) H₂O molecules
16. Which of the following is NOT a ferromagnetic element?
A) Iron
B) Cobalt
C) Nickel
D) Manganese
17. The oxidation state of chromium in chromate ion (CrO₄²⁻) is:
A) +4
B) +5
C) +6
D) +7
18. Which of the following compounds is used as a catalyst in the Haber process for ammonia synthesis?
A) Fe₂O₃
B) V₂O₅
C) Pt
D) Ni
19. The element that shows the least tendency to form complexes among the first-row transition elements is:
A) Scandium (Sc)
B) Titanium (Ti)
C) Zinc (Zn)
D) Copper (Cu)
20. Which of the following transition metal ions has the maximum magnetic moment?
A) Fe²⁺
B) Co²⁺
C) Ni²⁺
D) Cu²⁺
21. The oxidation state of copper in Cu₂O is:
A) +1
B) +2
C) +3
D) Variable
22. Which of the following is a characteristic property of interstitial compounds?
A) They are chemically inert.
B) They have metallic properties.
C) They have variable composition.
D) They are usually coloured.
23. The colour of Cu²⁺ ion in aqueous solution is:
A) Pale green
B) Blue
C) Violet
D) Yellow
24. Which of the following transition metals is the most abundant in the Earth's crust?
A) Iron (Fe)
B) Titanium (Ti)
C) Copper (Cu)
D) Nickel (Ni)
25. The element with the electronic configuration [Ar] 3d¹⁰ 4s¹ exhibits which oxidation state?
A) +1
B) +2
C) +3
D) Variable
26. Which compound is responsible for the green colour of emeralds?
A) Chromium impurity in Aluminium oxide
B) Iron impurity in Aluminium oxide
C) Nickel impurity in Aluminium oxide
D) Vanadium impurity in Aluminium oxide
27. Transition metals are good catalysts because they:
A) Can change their oxidation states.
B) Can form complexes.
C) Can adsorb reactant molecules on their surface.
D) All of the above.
28. The highest oxidation state of Iron (Fe) is observed in:
A) FeSO₄
B) Fe₂O₃
C) Fe(CN)₆⁴⁻
D) Fe³⁺
29. Which of the following ions has an unpaired electron configuration?
A) Sc³⁺
B) Ti⁴⁺
C) V³⁺
D) Zn²⁺
30. The magnetic moment of an ion is calculated using the formula:
A) μ = √n(n+2) Bohr magnetons
B) μ = n(n+2) Bohr magnetons
C) μ = √n Bohr magnetons
D) μ = n Bohr magnetons
31. Which of the following transition metals has a very low melting point compared to others in the series?
A) Chromium (Cr)
B) Manganese (Mn)
C) Iron (Fe)
D) Copper (Cu)
32. The oxidation state of vanadium in the vanadate ion (VO₄³⁻) is:
A) +3
B) +4
C) +5
D) +2
33. Which of the following is a ferro-magnetic substance?
A) Fe
B) Co
C) Ni
D) All of the above
34. The colour of transition metal compounds is due to:
A) d-d transitions.
B) Charge transfer transitions.
C) Both (a) and (b).
D) Absorption of visible light.
35. Which element in the first-row transition series shows the least variation in oxidation states?
A) Scandium (Sc)
B) Zinc (Zn)
C) Iron (Fe)
D) Cobalt (Co)
36. The stability of a complex formed by a transition metal ion is generally related to:
A) Its charge density.
B) The number of unpaired electrons.
C) Its ionization enthalpy.
D) Its magnetic moment.
37. Which of the following is an example of a coloured compound of a first-row transition metal?
A) TiO₂
B) V₂O₅
C) MnO₂
D) All of the above
38. The oxidation state of manganese in KMnO₄ is:
A) +2
B) +4
C) +6
D) +7
39. Which of the following ions is paramagnetic?
A) Sc³⁺
B) Ti⁴⁺
C) V³⁺
D) Zn²⁺
40. The formation of interstitial compounds is characteristic of transition metals because:
A) They have large atomic radii.
B) They have small atomic radii and can accommodate small atoms like H, C, N.
C) They readily form ionic bonds.
D) They have variable oxidation states.
41. Which of the following transition metals is diamagnetic in its common oxidation state?
A) Ti
B) V
C) Zn
D) Cu
42. The electronic configuration of the element with the highest second ionization enthalpy in the first-row transition series is:
A) [Ar] 3d⁵ 4s¹
B) [Ar] 3d⁵ 4s²
C) [Ar] 3d⁶ 4s¹
D) [Ar] 3d⁷ 4s²
43. Which of the following compounds of chromium is coloured?
A) CrCl₃
B) CrO₃
C) K₂Cr₂O₇
D) All of the above
44. The catalytic activity of transition metals is attributed to:
A) Their ability to form stable complexes.
B) Their variable oxidation states and ability to provide vacant d-orbitals.
C) Their high density and metallic character.
D) Their paramagnetic nature.
45. Which element exhibits the highest oxidation state in the first-row transition series?
A) Manganese (Mn)
B) Iron (Fe)
C) Cobalt (Co)
D) Nickel (Ni)
46. The magnetic behaviour of a transition metal ion is primarily due to:
A) Electron pairs in inner d-orbitals.
B) Unpaired electrons in d-orbitals.
C) Completely filled d-orbitals.
D) Valence s-electrons.
47. Which of the following ions is colourless?
A) Cu²⁺
B) Ni²⁺
C) Zn²⁺
D) Co²⁺
48. Which element in the first-row transition series has the highest melting point?
A) Scandium (Sc)
B) Titanium (Ti)
C) Vanadium (V)
D) Chromium (Cr)
49. The most common oxidation state of the first-row transition elements is generally:
A) +1
B) +2
C) +3
D) +4
50. Which of the following is NOT a characteristic property of first-row transition elements?
A) They exhibit variable oxidation states.
B) They form coloured compounds.
C) They possess high ionization enthalpies.
D) They form interstitial compounds.
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