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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 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: (ii) 3d44s1
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