1. Which of the following elements is not a part of the d-block?
Answer:
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?
Answer:
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?
Answer:
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?
Answer:
Explanation:
Lanthanides are well-known for their magnetic properties, especially compounds of gadolinium.
5. In which block do actinides belong?
Answer:
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?
Answer:
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?
Answer:
Explanation:
Lawrencium is the last element of the f-block.
8. Which of the following has the highest melting point?
Answer:
Explanation:
Tungsten has the highest melting point of all pure metals.
9. Which of the following is not a characteristic property of transition metals?
Answer:
Explanation:
Transition metals generally have good electrical conductivity.
10. Which f-block element is used in smoke detectors?
Answer:
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?
Answer:
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:
Answer:
Explanation:
The actinide series includes the elements from thorium to lawrencium.
13. Which of the following elements is used in permanent magnets?
Answer:
Explanation:
Iron and neodymium are used in the manufacture of permanent magnets.
14. The color in the transition metal ion is due to:
Answer:
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?
Answer:
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:
Answer:
Explanation:
All the given factors contribute to the ability of transition metals to form complex compounds.
17. Which of the following lanthanides is radioactive?
Answer:
Explanation:
Among the given options, only promethium is radioactive.
18. Which of the following is not a common oxidation state of actinides?
Answer:
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?
Answer:
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?
Answer:
Explanation:
Mercury is often referred to as the "strange metal" because of its unique properties like being liquid at room temperature.