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Class 12 Chemistry (Part Ii) Chapter 8 D And F Block Elements Quiz 4 (25 MCQs)

Quiz Instructions

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1. Which of the following statements explains why platinum, palladium, and rhodium are used in converters in car exhausts?

Correct Answer: A) Transition metals make good catalysts.

2. Transistion elements form alloys easily because they have

Correct Answer: C) Nearly same atomic size.

3. In transition series with the increase in atomic no. paramagnetism

Correct Answer: C) Increases to amaximum and then decreases.

4. The number of unpaired d electrons retained in Fe$^{+2}$ (Z= 26) ion is-:

Correct Answer: B) 4.

5. How do actinides differ in reactivity compared to lanthanides?

Correct Answer: D) Actinides are more reactive than lanthanides.

6. Which of the following compounds is expected to be coloured?

Correct Answer: B) CuSO$_{4}$.

7. What is the role of ligands in coordination chemistry?

Correct Answer: B) Ligands serve as electron pair donors to central metal atoms in coordination chemistry.

8. What is the primary reason for the high ionization enthalpies of lanthanoids?

Correct Answer: B) Low shielding effect.

9. Reason for lanthanoid contraction is

Correct Answer: A) Very poor shielding effect of f orbital.

10. The radius of La3= is 1.06 A . Which of the following is closest to Lu3+

Correct Answer: D) 0.85.

11. Which of the following period 4 oxides is used as either a physical or a chemical sunscreens in many types of commercial sunblock?

Correct Answer: A) TiO2.

12. Which of the following are d-block elements but not regarded as transition elements?

Correct Answer: B) Zn, Cd, Hg.

13. What is the common oxidation state of transition metals?

Correct Answer: D) +2 and +3.

14. Which of the following statements about actinoids is true?

Correct Answer: B) They exhibit a wide range of oxidation states.

15. The highest occupied s sublevel and a nearby f sublevel contain electrons.

Correct Answer: A) Inner transition metals.

16. Which of the following elements is known for its ability to form colored ions?

Correct Answer: B) Copper.

17. What is the primary reason for the formation of alloys by transition metals?

Correct Answer: D) Similar atomic sizes.

18. The basic character of transition monooxides

Correct Answer: B) Tio>Vo>Cro>Feo.

19. How do lanthanides differ from actinides in terms of electronic configuration?

Correct Answer: D) Lanthanides fill the 4f subshell; actinides fill the 5f subshell.

20. From Element to element Actinoid contraction is more than Lanthanoid contraction.

Correct Answer: A) True.

21. What are transition metals and where are they located in the periodic table?

Correct Answer: B) Transition metals are located in groups 3 to 12 of the periodic table.

22. Which of the following ions is colored due to d-d transitions?

Correct Answer: B) Cu2+.

23. D block elements form coloured compounds due to

Correct Answer: A) D-d transition.

24. Which is a chemical property of metals

Correct Answer: B) Corrosion.

25. What type of bonding do transition metals exhibit?

Correct Answer: C) Metallic bonding.

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