11. Transition elements are found in which blocks of the periodic table?

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

12. The transition elements are characterized by having partially filled:

a) s-orbitals
b) p-orbitals
c) d-orbitals
d) f-orbitals
Answer: c) d-orbitals

13. Which of the following is NOT a property of transition metals?

a) Variable oxidation states
b) High melting points
c) Formation of colored compounds
d) High reactivity with water
Answer: d) High reactivity with water

14. The transition metal known for its catalytic properties in the Haber process is:

a) Iron
b) Copper
c) Zinc
d) Nickel
Answer: a) Iron

15. The element that exhibits the highest oxidation state in its compounds is:

a) Iron
b) Manganese
c) Chromium
d) Copper
Answer: b) Manganese

16. Which of the following transition metals is used as a catalyst in the hydrogenation of alkenes?

a) Nickel
b) Palladium
c) Platinum
d) All of the above
Answer: d) All of the above

17. The color of potassium dichromate (K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7K2​Cr2​O7​) is:

a) Blue
b) Green
c) Red
d) Orange
Answer: d) Orange

18. The element that forms a complex with a coordination number of 6 is:

a) Copper
b) Nickel
c) Zinc
d) Iron
Answer: b) Nickel

19. The oxidation state of manganese in KMnO4\text{KMnO}_4KMnO4​ is:

a) +2
b) +4
c) +6
d) +7
Answer: d) +7

20. Which of the following transition metals has a completely filled d-subshell in its most common oxidation state?

a) Zinc
b) Iron
c) Copper
d) Chromium
Answer: a) Zinc