8. THE D- AND f-BLOCK ELEMENTS Objective

8. THE D- AND f-BLOCK ELEMENTS

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1. Oxidation number of gold metal is

(A) + 1
(B) O
(C) – 1
(D) all of these

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2. Shape of d-orbital is

(A) spherical
(B) dumb bell
(C) double dumb bell
(D) none of these

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3. Electronic configuration of alkaline earth element is

(A) ns²
(B) ns¹
(C) np⁶
(D) ns^o

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4. Outermost configuration 3d⁶4s²k is of

(A) Ca
(B) fe
(C) Mg
(D) Cu

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5. Which one of the following is called green vitriol ?

(A) FeSO₄.7H₂O
(B) CuSO₄.5H₂O
(C) CaSO₄.2H₂O
(D) None of these

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6. Which block of elements are known as transition elements ?

(A) p-block
(B) s-block
(C) d-block
(D) ƒ-block

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7. Most abundant element in earth’s crust is

(A) Si
(B) Al
(C) Zn
(D) Fe

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8. Which one of the following is diamagnetic ion ?

(A) Co²⁺
(B) Ni²⁺
(C) Cu²⁺
(D) Zn²⁺

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9. Which of the following is not an element of first transition series ?

(A) Iron
(B) Chromium
(C) Magnesium
(D) Nickel

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10. The correct order of E⁰_M2+/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

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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⁺

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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

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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)

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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⁺

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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

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16. Which of the following has no unpaired electrons but is coloured ?

(A) K₂Cr₂O₇
(B) K₂MnO₄
(c) CuSO₄ .5H₂O
(D) MnCl₂

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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

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18. Which of the following lanthanide ion is paramagnetic ?

(A) Ce⁴⁺
(B) Yb²⁺
(C) Lu³⁺
(D) Eu²⁺

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19. Lanthanoid contraction is due to increase in

(A) atomic number
(B) effective nuclear charge
(C) atomic radius
(D) valence electrons

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20. The correct configuration of ƒ-block elements are

(A) (n − 2) ƒ^{1 – 14} (n – 1) d^{o – 1} ns²
(B) (n – 1) ƒ^{1 – 14} (n – 1) d^{o – 1} ns²
(C) (n – 3) ƒ^{1 – 14} (n − 2) d^{o – 1} ns²
(D) (n – 2) ƒ^{० – 1} (n – 1)d d^{o – 1} ns²

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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

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22. The general electronic configuration of transition elements are

(A) (n – 1)d⁵
(B) (n – 1) d^{(1 – 10)}ns^{0.1 or 2}
(C) (n − 1) d^{(1 – 10)}ns^{0 – 2}
(D) none of these

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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

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24. Transitor elements are

(A) Metals
(B) Non-metals
(C) a-block elements
(D) Gas

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25. Which of the following elements is liquid at room temperature ?

(A) Zn
(B) Hg
(C) Cu
(D) Au

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26. Which of the following is known as red lead ?

(A) Pb₃O₄
(B) Pb₂O₃
(C) PbO
(D) PbO₂

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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