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Class 12 Chemistry (Part Ii) Chapter 8 D And F Block Elements Quiz 3 (25 MCQs)

Quiz Instructions

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1. What is the oxidation state of iron in [Fe(CN)6]4-?

Correct Answer: C) +2.

2. Among the following transition element pick out the element with the highest second ionization energy V, Cr, Mn, Cu

Correct Answer: B) Iv.

3. What is the IUPAC name for the complex [Cr(H2O)6]3+?

Correct Answer: B) Hexaaquachromium(III).

4. How do you determine the overall charge of a complex ion?

Correct Answer: C) The overall charge of a complex ion is the sum of the charges of the central metal ion and its ligands.

5. ELECTRINIC CONFIGURATION OF ELEMENT X IN +3 OXIDATION STATE IS [Ar] 3d5 . WHAT IS THE ATOMIC NUMBER?

Correct Answer: B) 26.

6. Which transition metal exhibits the maximum oxidation state?

Correct Answer: A) Manganese.

7. Which of the following metals show +3 oxidation state

Correct Answer: C) Gd.

8. How do you name the complex ion [CoCl2(NH3)4]+?

Correct Answer: C) Tetraammine dichlorocobalt(I).

9. Out of Mn$_{2}$O$_{7}$ V$_{2}$O$_{3}$, V$_{2}$O$_{5}$, CrO, Cr$_{2}$O$_{3}$, the basic oxides are

Correct Answer: D) V$_{2}$O$_{3}$ and CrO.

10. What are the common properties of transition metals?

Correct Answer: B) Common properties of transition metals include variable oxidation states, formation of colored compounds, ability to form complex ions, and catalytic activity.

11. Which of the following elements belong to actinoid-:

Correct Answer: C) Thorium.

12. What is the electronic configuration of d-block elements?

Correct Answer: A) (n-1)d1-10ns1-2.

13. D-block elements are known as transition elements because

Correct Answer: A) They transit metallic properties of s-block into non-metallic properties of p block.

14. Which of the following characterisitic of transition metals is associated with their catalytic property

Correct Answer: A) Variable oxidation state.

15. What is the coordination number?[Fe(H2O)6 ]Cl2

Correct Answer: D) 6.

16. Which of the following transition elements is used as a catalyst in Haber's process?

Correct Answer: A) Fe.

17. An atom with atomic number 21 belongs to category of-:

Correct Answer: C) D-block elements.

18. Electronic configuration of d-block element is

Correct Answer: C) (n-1) d $^{1-10}$ ns $^{1-2}$.

19. Which of the following is a characteristic of transition metals?

Correct Answer: A) Good conductors of heat.

20. Explain the electron configuration of a typical transition metal.

Correct Answer: C) Transition metals have partially filled d orbitals, with configurations like [Ar] 4s2 3d6 for iron.

21. The acidic, basic and amphoteric nature of Mn$_{2}$O$_{7}$, V$_{2}$O$_{5}$ and CrO are respectively

Correct Answer: C) Acidic, amphoteric and basic.

22. Which transition metal is known for its high melting point?

Correct Answer: A) Tungsten.

23. What is the general electronic configuration of actinoids?

Correct Answer: D) (n-2)f1-14(n-1)d0-1ns2.

24. The magnetic moment is determined by the number of unpaired electrons and is calculated byusing the 'spin-only' formula,

Correct Answer: A) $\sqrt{n\left(n+2\right)}$.

25. Transition elements act as catalyst due to

Correct Answer: A) Variable oxidation state.

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