D-Block Elements MCQs [Chemistry]

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

1. Transition elements, in general, exhibit the following properties, except one. Name that property
(A) Natural radioactivity
(B) Variable oxidation state
(C) Tendency to form complexes
(D) Formation of alloys

2. The most stable oxidation state of chromium is
(A) +6
(B) +3
(C) +4
(D) +2

3. Which of the mentioned statements is not true regarding nomenclature of coordination complexes?
(A) The cation is named first and then anion
(B) The anion is named first and then cation
(C) Ligands are named in alphabetical order
(D) The names of the anionic ligands ends in the suffix -o

4. Which is the substance helpful and used for cancer therapy?
(A) Co
(B) Fe
(C) Ni
(D) Rn

5. Molten iron withdrawn from the blast furnace is known as _________.
(A) Pig iron
(B) Wrought iron
(C) Bessemer iron
(D) Stainless steel

6. Pig iron is also known as
(A) Stainless steel
(B) Steel
(C) Wrought iron
(D) Cast iron

7. In the extraction of iron, the furnace charge consists of iron ore, coke and limestone. The function of limestone is to act as
(A) An oxidizing agent
(B) Flux
(C) A reducing agent
(D) Slag

8. If steel is heated to a temperature well below red heat and is then cooled slowly, the process is known as
(A) Nitriding
(B) Quenching
(C) Tempering
(D) Annealing

9. The bonding in transition metal complexes was not well understood until the pioneer work of
(A) PS Jaiswal
(B) Alfred Werner
(C) BR Thukral
(D) GS Manku

10. The correct formula form of the coordination compound is
(A) [Pt(NH3)6]Cl4
(B) PtCl4·6NH3
(C) Both A & B
(D) None of A, B, and C

11. Which of the mentioned is a neutral ligand?
(A) CO & NO
(B) H₂O
(C) NH3
(D) All A, B, and C

12. The suffix “ate” at the end of the name of the complex signifies that it is
(A) Cation
(B) Neutral
(C) Anion
(D) None of A, B, and C

13. CoCl3·6NH3 has six NH3 molecules that fulfill which valence of the Co3+ metal ion?
(A) Secondary
(B) Primary
(C) Both A & B
(D) None of A, B, and C

14. Which of the mentioned is soluble in water?
(A) AgI
(B) AgCl
(C) AgBr
(D) AgF

15. Gold dissolves in aqua regia forming
(A) HAuCl4
(B) Au(NO3)3
(C) AuCl3
(D) AuCl

16. Zinc oxide is
(A) A basic oxide
(B) An acidic oxide
(C) An amphoteric oxide
(D) A neutral oxide

17. The maximum oxidation shown by manganese is ________.
(A) +2
(B) +4
(C) +7
(D) +5

18. What is the oxidation state of chromium in [Cr(NH3)6]3+ complex ion?
(A) +3
(B) +2
(C) +4
(D) +5

19. Which of the mentioned shows maximum number of oxidation states in 3d series?
(A) Co
(B) Ni
(C) Mn
(D) Zn

20. What type of bonding occurs in d-block elements?
(A) Ionic
(B) Covalent
(C) Metallic
(D) Both B & C

21. Metals are _______.
(A) Ductile
(B) Malleable
(C) Hard
(D) All A, B, and C

22. Which of the mentioned statements is true about transition metals?
(A) Tendency to form complexes
(B) Some are helpful and used as catalyst
(C) Some metals exhibit color
(D) None of A, B, and C

23. Which of the mentioned cations is colorless?
(A) Ni2+
(B) Zn2+
(C) Cu2+
(D) Fe2+

24. According to CFT, the metal ligand bond is considered to be ionic to what percentage?
(A) 80%
(B) 90%
(C) 100%
(D) 70%

25. What is the composition of brass alloy?
(A) Cu-Ni
(B) Cu-Zn-Ni
(C) Cu-Zn-Sn
(D) Cu-Zn

26. The composition of bronze alloy is
(A) Cu-Ni
(B) Cu-Zn-Ni
(C) Cu-Zn
(D) Cu-Zn-Sn

27. VBT does not explain
(A) Heat of formation
(B) Color of transition metal ion
(C) Absorption spectra
(D) All A, B, and C

28. The color of transition metals is due to
(A) Ionization
(B) n-n transitions
(C) d-d transitions
(D) Loss of s electron

29. Which of the mentioned cations has greatest number of unpaired electrons?
(A) Mn²⁺
(B) Co²⁺
(C) Fe²⁺
(D) Ni²⁺

30. On the basis of Crystal Field Theory (CFT), the bonding between the metal and ligand is totally
(A) Coordinate
(B) Covalent
(C) Ionic
(D) Metallic

31. CFT can very well explain
(A) Spectra of transition metal
(B) Magnetic properties
(C) Color
(D) All A, B, and C

32. In group theory, the triply degenerate set is denoted by
(A) t₂g
(B) e_g
(C) e²g
(D) tg

33. The energy gap between t₂g and e_g sets is denoted by
(A) Å
(B) 10 Dq
(C) Both A & B
(D) 1Dq

34. The composition of German silver alloy is
(A) Cu-Ni
(B) Cu-Zn-Sn
(C) Cu-Zn
(D) Cu-Zn-Ni

35. The maximum absorption in [Ti(OH₂)₆]³⁺ takes place at wavelength of
(A) 5000 Å
(B) 4000 Å
(C) 6000 Å
(D) 10000 Å

36. [Ti(OH₂)₆]³⁺ gives color
(A) Green
(B) Purple
(C) Red
(D) Blue

37. If the absorbed light is green, the transmitted light will be
(A) Violet
(B) Orange
(C) Purple
(D) Red

38. The secondary valency of Co in CoCl₃·6NH₃ is
(A) 2
(B) 6
(C) 4
(D) 8