Title 08. THE D- & F-BLOCK ELEMENTS.pdf ✅

PAPER 1 (1.) Among d-block elements, the most abundant element in earth crust belongs to : (1) 4 d-series (2) 3 d-series (3) 5 d-series (4) 6 d-series (2.) The correct order of ionic radii of Ce,La,Pm and Yb in +3 oxidation state is : (1) 3 3 3 3 La Pm Ce Yb + + + +    (2) 3 3 3 3 La Ce Pm Yb + + + +    (3) 3 3 3 3 Yb Ce Pm La + + + +    (4) 3 3 3 3 Yb Pm Ce La + + + +    (3.) Transition metal does not exhibit the property of : (1) Formation of coloured salt (2) Variable oxidation states (3) Inert pair effect (4) Catalytic activity (4.) The general electronic configuration of transition element is : (1) ( ) 1 5 n d 1 − − (2) ( ) 1 10 1 n 1 d ns − − (3) ( ) 1 10 0 2 n d 1 ns − − − (4) None of these (5.) Which is correct order of stability of dihalides of 14th groups elements : (1) PbCl SnCl GeCl SiCl 2 2 2 2    (2) SiCl GeCl SnCl PbCl 2 2 2 2    (3) GeCl SnCl PbCl SiCl 2 2 2 2    (4) PbCl GeCl SiCl SnCl 2 2 2 2    (6.) The atomic number of V,Cr, Mn and Fe are respectively 23, 24, 25 and 26 . Which one of these may be expected to have the highest second ionisation enthalpy : (1) V (2) Cr (3) Mn (4) Fe (7.) Which of the following statement is not correct : (1) La(OH)3 is less basic than Lu(OH)3 (2) In lanthanoid series, ionic radius of 3 La + ion decreases (3) La is an elements of transition series rather than lanthanoid series (4) Atomic radii of Zr and Hf are same because of lanthanoid contration (8.) In 2 Cr O .... 2 7 − . : (1) 4Cr O− bonds are equivalent (2) 6Cr O− bonds are equivalent (3) All Cr O− bonds are equivalent (4) All Cr O− bonds are non equivalent (9.) Which of the following oxides are acidic in nature: (1) MnO (2) CrO3 (3) Cr O2 3 (4) MnO2 (10.) Most of the transition metal compounds are coloured generally due to : (1) d-d transition (2) small size
(3) variable oxidation state (4) None of these (11.) Which of the two have almost similar size : (1) 22 Ti and 40 Zr (2) 41 Nb and 73 Ta (3) 39 Y and 57 La (4) 20 Ca and 31 lr (12.) Some oxides of transition metals given below : MnO,Cr O ,CrO ,Mn O , V O 2 3 2 2 7 2 5 Which of the following represents group of amphoteric oxide only : (1) MnO,Cr O2 3 (2) V O ,Mn O 2 5 2 7 (3) Cr O ,CrO 2 3 2 (4) MnO,Cr O ,Mn O 2 3 2 7 (13.) Melting point of transition metals is plotted in the graph given below : Identify A, B, C in the graph respectively. (1) Cr, Tc, W (2) Cr, W, Rh (3) Mn,Cr,Tc (4) None of these (14.) Which of the following is not hydrolysed easily : (1) CCl4 (2) SiCl4 (3) SnCl4 (4) GeCl4 (15.) The electronic configuration of four elements are given below. Which element does not belong to the same family as other : (1)   14 10 2 Xe 4f 5 6 d s (2)   10 2 Kr 4 d 5 s (3)   2 5 Ne 3 3 s p (4)   10 2 Ar 3 d 4 s (16.) Which of the following statement concerning lanthanide elements is false :
(1) All lanthanides are highly dense metals (2) More characteristic oxidation state of lanthanide elements is +3 (3) Lanthanides are separated from one another by ion exchange method (4) Ionic radii of trivalent lanthandies steadily increases with increase in the atomic number. (17.) A transition element X has a configuration [Ar] 4 3d in its +3 oxidation state. Its atomic number is : (1) 22 (2) 19 (3) 25 (4) 26 (18.) The lanthanide contraction is responsible for the fact that : (1) Zr and Hf have about the same radius (2) Zr and Zn have the same oxidatio state (3) Zr and Y have about the same radius (4) Zr and Nb have similar oxidation state (19.) Correct statement regarding CO is / are : A. It is used in Mond's process B. It can not show back bonding C. CO molecule is diamagnetic (1) A and C (2) B and C (3) A and B (4) All are correct (20.) Which of the following has more unpaird delectrons : (1) 3 Ni + (2) 2 Fe + (3) Zn+ (4) Cu + (21.) In which of the following compounds transition metal has zero oxidation state : (1) NOClO4 (2) NH NH 2 2  (3) CrO5 (4) Fe(CO)5  (22.) Which of the following shows maximum number of oxdiation states : (1) Cr (2) Fe (3) Mn (4) V (23.) The basic character of the transition metal monoxides follows the order (Atomic no's. Ti 22, V 23,Cr 24,Fe 26 = = = = ) : (1) VO CrO TiO FeO    (2) CrO VO FeO TiO    (3) TiO FeO VO CrO    (4) TiO VO CrO FeO    (24.) The correct order of ionic radii of 3 3 3 Y ,La ,Eu + + + and 3 Lu + is (Atomic nos. Y 39,La 57,Eu 63 = = = , Lu = 71): (1) 3 3 3 3 Y La Eu Lu + + + +    (2) 3 3 3 3 Y Lu Eu La + + + +    (3) 3 3 3 3 Lu Eu La Y + + + +    (4) 3 3 3 3 La Eu Lu Y + + + +    (25.) Among the folloiwng series of transition metal ions, the one where all metal ions have 2 3 d electronic configuration is
(At. nos. Ti 22, V 23,Cr 24,Mn 25 = = = = ) (1) 3 2 3 4 Ti ,V ,Cr ,Mn + + + + (2) 4 6 7 Ti ,V ,Cr ,Mn + + + + (3) 4 3 2 3 Ti ,V ,Cr ,Mn + + + + (4) 2 3 4 5 Ti ,V ,Cr ,Mn + + + + (26.) The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is : (1) One (2) Two (3) Five (4) One fifth (27.) Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy : (1) Vanadium 23 (Z = ) (2) Chromium ( Z = 24) (3) Manganese (Z = 25) (4) Iron (Z = 26) (28.) In which of the following pair both the ions are coloured in aqueous solution (At. no. : Sc 21,Ti = = = = = 22, Ni 28,Cu 29,Co 27 ): (1) 2 Ni ,Cu + + (2) 2 3 Ni ,Ti + + (3) 3 3 Sc ,Ti + + (4) 3 2 Sc ,Co + + (29.) More number of oxidation sates are exhibited by the actinoids than by the lanathanoids. The main reason for this is : (1) More active nature of the actinoids (2) More energy difference between 5f and 6 d orbitals than that between 4f and 5 d orbitals (3) Lesser energy difference between 5f and 6 d orbitals than that of between 4f and 5 d orbitals (4) Greater metallic character of the lanthanoids than that of the corresponding actionoids. (30.) Which one of the following ions is the most stable in aqueous solution : (At. No. Ti 22, V 23,Cr 24,Mn 25 = = = = ) (1) 3 V + (2) 3 Ti + (3) Mn3+ (4) 3 Cr + (31.) Which of the following statements are correct about Zn,Cd and Hg ? (i) Zn,Cd and Hg are not transition elements. (ii) The compounds of Zn,Cd and Hg are colourless. (iii) Zn,Cd and Hg are diamagnetic in nature. (iv) Zn,Cd and Hg have low melting points. (1) (i) and (ii) only (2) (ii) and (iii) only (3) (iii) and (iv) only (4) All are correct (32.) In transition series, as the atomic number increases, paramagnetism: (1) increases gradually (2) decreases gradually