1. 1. What is the primary reason for the catalytic properties of transition metals?

2. 2. Which of the following statements about actinoids is correct?

3. 3. Which of the following is NOT a property of transition metal alloys?

4. 4. What is the main reason for the formation of colored ions in transition elements?

5. 5. Which of the following ions has the electronic configuration [Ar] 3d6?

6. 6. Which of the following transition metal ions is colorless in aqueous solution?

7. 7. What is the magnetic moment (in BM) of Fe3+ ion? (Atomic number of Fe = 26)

8. 8. Which of the following is NOT a use of potassium permanganate?

9. 9. Which actinoid exhibits the +3 oxidation state exclusively?

10. 10. Which of the following statements about lanthanoids is INCORRECT?

11. 11. What is the lanthanoid contraction?

12. 12. Which of the following is NOT a consequence of lanthanoid contraction?

13. 13. Which actinoid is most commonly used in nuclear reactors?