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Class 12 Chemistry (Part Ii) Chapter 8 D And F Block Elements Quiz 1 (25 MCQs)

Quiz Instructions

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1. Provide an example of a bidentate ligand and its complex.

Correct Answer: D) Ethylenediamine (en) and its complex [Cu(en)2]2+.

2. Which of the following will not act as oxidizing agents?(a) CrO$_{3}$ (b) MoO$_{3}$(c) WO$_{3 }$ (d) CrO$_{4}$$^{2-}$

Correct Answer: B) B, c.

3. Titanium shows magnetic moment of 1.73BM in its compound . What is the oxidation state of Ti in the compound

Correct Answer: C) 3.

4. Which of the following is a property of f-block elements?

Correct Answer: A) They are all radioactive.

5. Highest oxidation state of manganese flouride is +4 but highest oxidation state in oxides is +7 because

Correct Answer: D) F can form single bond only and O can form multiple bonds.

6. Most of the transition metals and theircompounds possess catalytic properties.

Correct Answer: C) All the above.

7. D-block elements loses first elecrton(s) from .....

Correct Answer: D) 4s.

8. For M$^{3+}$/M$^{2+}$ the E$^{0}$ values of some metals are given, which of the metal is most stable in +3 oxidation stateCr$^{3+}$/Cr$^{2+}$=-0.41V, Mn$^{3+}$/Mn$^{2+}$ = +1.5 V, Fe$^{3+}$/Fe$^{2+}$ = +0.80 V

Correct Answer: A) Cr$^{3+}$.

9. What happens to the atomic radii of 3d-series elements as atomic number increases?

Correct Answer: A) Decreases.

10. What is the significance of the d-block in the periodic table?

Correct Answer: B) The d-block contains transition metals that are important for their unique chemical properties and applications.

11. The highest magnetic moment shown by the transition metal ion with outer most configuration is

Correct Answer: A) 3d5.

12. Fe is

Correct Answer: B) Ferromagnetic.

13. What is the oxidation state of the central metal in [Cu(NH3)4]2+?

Correct Answer: D) +2.

14. Which series of transition metals includes elements from Scandium to Zinc?

Correct Answer: D) 3d series.

15. Which of the following is most stable in aqueous solution?

Correct Answer: A) Mn$^{2+}$.

16. Each rows of d-block elements has ..... elements.

Correct Answer: D) 10.

17. Although Zr is 4d series and Hf is 5d series yet they have similarity in properties due to

Correct Answer: C) Both have similar atomic radii.

18. How does the size of lanthanide ions change across the series?

Correct Answer: B) The size of lanthanide ions decreases across the series.

19. What is the effect of adding a base to potassium dichromate?

Correct Answer: D) Color changes to yellow.

20. For decomposition of H2O2 ..... is used as a catalyst

Correct Answer: C) MnO2.

21. What are the typical uses of lanthanides in modern technology?

Correct Answer: B) Lanthanides are typically used in magnets, phosphors, catalysts, batteries, and electronic devices.

22. Which one of the following is diamagnetic ion?

Correct Answer: D) Zn$^{2+}$.

23. Which of the following lanthanides are used in MRI technology?

Correct Answer: A) Gd.

24. D block elements are known as transition elements because

Correct Answer: B) They have vacancy in d orbital in one of the oxidation state or in ground state.

25. Which of the following lanthanoids show +2 oxidation state beside the characteristic oxidation state +3 of lanthanoids

Correct Answer: C) Yb.

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