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) тАУ 1
(D) all of these
Answer тЗТ (A)
2. Shape of d-orbital is
(A) spherical
(B) dumb bell
(C) double dumb bell
(D) none of these
Answer тЗТ (C)
3. Electronic configuration of alkaline earth element is
(A) ns2
(B) ns1
(C) np6
(D) nso
Answer тЗТ (A)
4. Outermost configuration 3d64s2k is of
(A) Ca
(B) fe
(C) Mg
(D) Cu
Answer тЗТ (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 тЗТ (A)
6. Which block of elements are known as transition elements ?
(A) p-block
(B) s-block
(C) d-block
(D) ╞Т-block
Answer тЗТ (C)
7. Most abundant element in earth’s crust is
(A) Si
(B) Al
(C) Zn
(D) Fe
Answer тЗТ (A)
8. Which one of the following is diamagnetic ion ?
(A) Co2+
(B) Ni2+
(C) Cu2+
(D) Zn2+
Answer тЗТ (D)
9. Which of the following is not an element of first transition series ?
(A) Iron
(B) Chromium
(C) Magnesium
(D) Nickel
Answer тЗТ (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 тЗТ (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 тЗТ (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 тЗТ (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 тЗТ (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 тЗТ (B)
15. In the dichromate anion (Cr2O )
(A) all Cr тАУ 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 тЗТ (B)
16. Which of the following has no unpaired electrons but is coloured ?
(A) K2Cr2O7
(B) K2MnO4
(c) CuSO4 .5H2O
(D) MnCl2
Answer тЗТ (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 тЗТ (D)
18. Which of the following lanthanide ion is paramagnetic ?
(A) Ce4+
(B) Yb2+
(C) Lu3+
(D) Eu2+
Answer тЗТ (D)
19. Lanthanoid contraction is due to increase in
(A) atomic number
(B) effective nuclear charge
(C) atomic radius
(D) valence electrons
Answer тЗТ (B)
20. The correct configuration of ╞Т-block elements are
(A) (n тИТ 2) ╞Т1 тАУ 14 (n – 1) do – 1 ns2
(B) (n – 1) ╞Т1 тАУ 14 (n – 1) do – 1 ns2
(C) (n – 3) ╞Т1 тАУ 14 (n тИТ 2) do – 1 ns2
(D) (n – 2) ╞Треж – 1 (n – 1)d do – 1 ns2
Answer тЗТ (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 тЗТ (A)
22. The general electronic configuration of transition elements are
(A) (n – 1)d5
(B) (n – 1) d(1 тАУ 10)ns0.1 or 2
(C) (n тИТ 1) d(1 тАУ 10)ns0 – 2
(D) none of these
Answer тЗТ (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 тЗТ (A)
24. Transitor elements are
(A) Metals
(B) Non-metals
(C) a-block elements
(D) Gas
Answer тЗТ (C)
25. Which of the following elements is liquid at room temperature ?
(A) Zn
(B) Hg
(C) Cu
(D) Au
Answer тЗТ (B)
26. Which of the following is known as red lead ?
(A) Pb3O4
(B) Pb2O3
(C) PbO
(D) PbO2
Answer тЗТ (A)
Class 12th Chemistry Objective Question English
S.N | CHEMISTRY OBJECTIVE English Medium |
1 | SOLID STATE┬а |
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 |