8. THE D- AND f-BLOCK ELEMENTS Objective

8. THE D- AND f-BLOCK ELEMENTS
1. Oxidation number of gold metal is
(A) + 1
(B) O
(C) – 1
(D) all of these
Answer ⇒ (A)
2. Shape of d-orbital is
(A) spherical
(B) dumb bell
(C) double dumb bell
(D) none of these
Answer ⇒ (C)
3. Electronic configuration of alkaline earth element is
(A) ns2
(B) ns1
(C) np6
(D) nso
Answer ⇒ (A)
4. Outermost configuration 3d64s2k is of
(A) Ca
(B) fe
(C) Mg
(D) Cu
Answer ⇒ (B)
5. Which one of the following is called green vitriol ?
(A) FeSO4.7H2O
(B) CuSO4.5H2O
(C) CaSO4.2H2O
(D) None of these
Answer ⇒ (A)
6. Which block of elements are known as transition elements ?
(A) p-block
(B) s-block
(C) d-block
(D) ƒ-block
Answer ⇒ (C)
7. Most abundant element in earth’s crust is
(A) Si
(B) Al
(C) Zn
(D) Fe
Answer ⇒ (A)
8. Which one of the following is diamagnetic ion ?
(A) Co2+
(B) Ni2+
(C) Cu2+
(D) Zn2+
Answer ⇒ (D)
9. Which of the following is not an element of first transition series ?
(A) Iron
(B) Chromium
(C) Magnesium
(D) Nickel
Answer ⇒ (C)
10. The correct order of E0M2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is
(A) Fe > Mn > Cr > Co
(B) Cr > Mn > Fe > Co
(C) Mn > Cr > Fe > Co
(D) Cr > Fe > Mn > Co
Answer ⇒ (C)
11. The number of unpaired electrons in gaseous species of Mn3+, Cl3+ and V3+ respectively are …… and the most stable species is ………..
(A) 4, 3 and 2; V3+
(B) 3, 3 and 2; Cr3+
(C) 4, 3 and 2; Cr3+
(D) 3, 3 and 3; Mn3+
Answer ⇒ (C)
12. The melting points of Cu, Ag and Au follow the order
(A) Cu > Ag > Au
(B) Cu > Au > Ag
(C) Au > Ag > Cu
(D) Ag > Au > Cu
Answer ⇒ (B)
13. In which of the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other ?
(A) Ti+, Ti3+
(B) Cu+, Cu2+
(C) Cr2+, Cr3+
(D) V2+, VO2+ (V4)
Answer ⇒ (A)
14. Which of the following pairs of ions have the same electronic configuration ?
(A) Cu2+, Cr2+
(B) Fe3+, Mn2+
(c) Co3+, Ni3+
(D) Sc3+, Cr3+
Answer ⇒ (B)
15. In the dichromate anion (Cr2O )
(A) all Cr – O bonds are equivalent
(B) 6 Cr – O bonds are equivalent
(C) 3 Cr – O bonds are equivalent
(D) no bonds in Cr2O are equivalent
Answer ⇒ (B)
16. Which of the following has no unpaired electrons but is coloured ?
(A) K2Cr2O7
(B) K2MnO4
(c) CuSO4 .5H2O
(D) MnCl2
Answer ⇒ (A)
17. V2O5 reacts with akalies as well as acids to give
(A) VO and VO2+
(B) VO2+ and Vo
(C) VO and VO2+
(D) VO and VO
Answer ⇒ (D)
18. Which of the following lanthanide ion is paramagnetic ?
(A) Ce4+
(B) Yb2+
(C) Lu3+
(D) Eu2+
Answer ⇒ (D)
19. Lanthanoid contraction is due to increase in
(A) atomic number
(B) effective nuclear charge
(C) atomic radius
(D) valence electrons
Answer ⇒ (B)
20. The correct configuration of ƒ-block elements are
(A) (n − 2) ƒ1 – 14 (n – 1) do – 1 ns2
(B) (n – 1) ƒ1 – 14 (n – 1) do – 1 ns2
(C) (n – 3) ƒ1 – 14 (n − 2) do – 1 ns2
(D) (n – 2) ƒ० – 1 (n – 1)d do – 1 ns2
Answer ⇒ (A)
21. KMnO4 acts as an oxidising agent in acidic medium. The number of moles of KMnO4 that will be needed to react with one mole of sulphide ions in acidic solution is
Answer ⇒ (A)
22. The general electronic configuration of transition elements are
(A) (n – 1)d5
(B) (n – 1) d(1 – 10)ns0.1 or 2
(C) (n − 1) d(1 – 10)ns0 – 2
(D) none of these
Answer ⇒ (C)
23. The highest magnetic moment shown by the transition metal ion with the outermost electronic configuration is
(A) 3d5
(B) 3d2
(C) 3d7
(D) 3d9
Answer ⇒ (A)
24. Transitor elements are
(A) Metals
(B) Non-metals
(C) a-block elements
(D) Gas
Answer ⇒ (C)
25. Which of the following elements is liquid at room temperature ?
(A) Zn
(B) Hg
(C) Cu
(D) Au
Answer ⇒ (B)
26. Which of the following is known as red lead ?
(A) Pb3O4
(B) Pb2O3
(C) PbO
(D) PbO2
Answer ⇒ (A)
Class 12th Chemistry Objective Question English
S.N | CHEMISTRY OBJECTIVE English Medium |
1 | SOLID STATE |
2 | SOLUTION |
3 | ELECTROCHEMISTRY |
4 | CHEMICAL KINETICS |
5 | SURFACE CHEMISTRY |
6 | GENERAL PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS |
7 | THE P-BLOCK ELEMENTS |
8 | THE D- AND f-BLOCK ELEMENTS |
9 | CO-ORDINATION COMPOUNDS |
10 | HALOALKANES AND HALOARENES |
11 | ALCOHOLS, PHENOLS AND ETHERS |
12 | ALDEHYDES, KETONES AND CARBOXYLIC ACIDS |
13 | AMINES |
14 | BIOMOLECULES |
15 | POLYMERS |
16 | CHEMISTRY IN EVERYDAY LIFE |