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Class 12 Chemistry MCQ Chapter 8 The d-and f- Block Elements
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The d-and f- Block Elements
Chapter: 8
| MCQ |
1. Transition elements are:
(i) s-block.
(ii) p-block.
(iii) d-block.
(iv) None of the above.
Ans: (iii) d-block.
2. Which transition element has the configuration 3d10 4s1?
(i) Cu.
(ii) Ag.
(iii) Ni.
(iv) Zn.
Ans: (i) Cu.
3. An atom with atomic the category of: number 21 belongs to
(i) s-block elements.
(ii) p-block elements.
(iii) d-block elements
(iv) f-block elements.
Ans: (iii) d-block elements.
4. What is the primary reason for the exceptions in the electronic configurations of some transition metals?
(i) High electronegativity.
(ii) Stability of filled and half-filled orbitals.
(iii) Availability of d electrons.
(iv) Larger atomic radius.
Ans: (ii) Stability of filled and half-filled orbitals.
5. The first transition element is:
(i) Chromium.
(ii) Scandium.
(iii) Nickel.
(iv) Copper.
Ans: (ii) Scandium.
6. Which element is known for its cubic close-packed (ccp) structure?
(i) Zr.
(ii) W.
(iii) Ag.
(iv) V.
Ans: (iii) Ag.
7. Which has the largest radii?
(i) Cr3+
(ii) Mn3+
(iii) Fe3+
(iv) Co3+
Ans: (i) Cr3+
8. Which of the following has magnetic moment value of 5.9?
(i) Fe2+
(ii) Fe3+
(iii) Ni2+
(iv) Cu2+
Ans: (ii) Fe3+
9. Which of the following ions has the most stable d10 configuration?
(i) Fe3+
(ii) Cu2+
(iii) Zn2+
(iv) Ni2+
Ans: (iii) Zn2+
10. The number of d-electrons retained in Fe2+ (At. no. of Fe = 26 ) ion is:
(i) 2
(ii) 5
(iii) 4
(iv) 6
Ans: (iv) 6
11. Which series of elements shows an almost constant atomic radius when compared to the previous series?
(i) 3d series.
(ii) 4d series.
(iii) 5d series.
(iv) 6d series.
Ans: (iii) 5d series.
12. What is the primary reason for the similarity in radii between the second (4d) and third (5d) series of transition elements?
(i) Increased shielding effect of f electrons.
(ii) Lanthanoid contraction.
(iii) Increased atomic mass.
(iv) Similar electronic configurations.
Ans: (ii) Lanthanoid contraction.
13. Electronic configuration (outermost) of Mn2+ ion (at. no. of Mn = 25 ) in its ground state is:
(i) 3d5s6
(ii) 3d44s1
(iii) 3d34s 2
(iv) 3d24s2p2
Ans: (i) 3d5s6
14. Anomalous electronic configuration in the 3d series are of
(i) Cr and Fe.
(ii) Cu and Zn.
(iii) Fe and Cu.
(iv) Cr and Cu.
Ans: (iv) Cr and Cu.
15. Cr has electronic configuration:
(i) s² 3p⁶ 3d⁴ 4s²
(ii) 3s² 3p⁶ 3d⁵ 4s¹
(iii) 3s² 2p⁶ 3d⁶
(iv) None of the above.
Ans: (ii) 3s² 3p⁶ 3d⁵ 4s¹
