Class 12 Chemistry MCQ – d and f Block Elements

1. Which of the following elements is not a part of the d-block?

a) Iron
b) Copper
c) Zinc
d) Lanthanum

Answer:

d) Lanthanum

Explanation:

Lanthanum is an f-block element and is the first element of the lanthanides series.

2. Which element has the electronic configuration [Xe] 4f^7 5d^1 6s^2?

a) Gadolinium
b) Terbium
c) Europium
d) Samarium

Answer:

a) Gadolinium

Explanation:

Gadolinium has the electronic configuration [Xe] 4f^7 5d^1 6s^2.

3. Which of the following elements is known as a coinage metal?

a) Silver
b) Gold
c) Copper
d) All of the above

Answer:

d) All of the above

Explanation:

Silver, gold, and copper are all known as coinage metals due to their historical use in coins.

4. Which of the following series is known for its magnetic properties?

a) Actinides
b) Lanthanides
c) Both a and b
d) None of the above

Answer:

b) Lanthanides

Explanation:

Lanthanides are well-known for their magnetic properties, especially compounds of gadolinium.

5. In which block do actinides belong?

a) d-block
b) f-block
c) p-block
d) s-block

Answer:

b) f-block

Explanation:

Actinides are part of the f-block of the periodic table.

6. Which of the following elements is a transition metal but not a d-block element?

a) Zinc
b) Cadmium
c) Mercury
d) All of the above

Answer:

d) All of the above

Explanation:

Though zinc, cadmium, and mercury are technically transition metals, they are not considered d-block elements because they do not have incompletely filled d-orbitals in their ground state or common oxidation states.

7. Which is the last element of the f-block?

a) Thorium
b) Lawrencium
c) Californium
d) Nobelium

Answer:

b) Lawrencium

Explanation:

Lawrencium is the last element of the f-block.

8. Which of the following has the highest melting point?

a) Iron
b) Gold
c) Tungsten
d) Silver

Answer:

c) Tungsten

Explanation:

Tungsten has the highest melting point of all pure metals.

9. Which of the following is not a characteristic property of transition metals?

a) High melting point
b) Formation of colored compounds
c) Low electrical conductivity
d) Ability to form complex compounds

Answer:

c) Low electrical conductivity

Explanation:

Transition metals generally have good electrical conductivity.

10. Which f-block element is used in smoke detectors?

a) Americium
b) Curium
c) Berkelium
d) Neptunium

Answer:

a) Americium

Explanation:

Americium-241, an isotope of americium, is commonly used in smoke detectors.

11. Which d-block element is used in making aircraft bodies because of its low density?

a) Titanium
b) Iron
c) Nickel
d) Zinc

Answer:

a) Titanium

Explanation:

Titanium is used in aircraft bodies due to its high strength-to-weight ratio.

12. The series of f-block elements from thorium to lawrencium is called:

a) Lanthanides
b) Actinides
c) Transition series
d) Noble gases

Answer:

b) Actinides

Explanation:

The actinide series includes the elements from thorium to lawrencium.

13. Which of the following elements is used in permanent magnets?

a) Iron
b) Neodymium
c) Palladium
d) Both a and b

Answer:

d) Both a and b

Explanation:

Iron and neodymium are used in the manufacture of permanent magnets.

14. The color in the transition metal ion is due to:

a) d-d transitions
b) s-s transitions
c) p-p transitions
d) f-f transitions

Answer:

a) d-d transitions

Explanation:

The color in transition metal ions is primarily due to the d-d electronic transitions.

15. Which of the following elements acts as a catalyst in the Haber process?

a) Iron
b) Nickel
c) Platinum
d) Palladium

Answer:

a) Iron

Explanation:

Iron acts as a catalyst in the Haber process for the synthesis of ammonia.

16. The ability of transition metals to form complexes is due to:

a) Their small size
b) Their high ionic charge
c) Presence of vacant d-orbitals
d) All of the above

Answer:

d) All of the above

Explanation:

All the given factors contribute to the ability of transition metals to form complex compounds.

17. Which of the following lanthanides is radioactive?

a) Cerium
b) Neodymium
c) Promethium
d) Europium

Answer:

c) Promethium

Explanation:

Among the given options, only promethium is radioactive.

18. Which of the following is not a common oxidation state of actinides?

a) +3
b) +4
c) +5
d) +8

Answer:

d) +8

Explanation:

+8 is not a common oxidation state for actinides.

19. The "coinage metals" like copper, silver, and gold are in which group of the periodic table?

a) Group 10
b) Group 11
c) Group 12
d) Group 13

Answer:

b) Group 11

Explanation:

The coinage metals, copper, silver, and gold, belong to Group 11 of the periodic table.

20. Which element is known as the "strange metal" due to its unusual properties and is also a d-block element?

a) Bismuth
b) Antimony
c) Gallium
d) Mercury

Answer:

d) Mercury

Explanation:

Mercury is often referred to as the "strange metal" because of its unique properties like being liquid at room temperature.

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