d- and f-Block Elements PYQs Set 2 (PDF)

Set 2 of 14 · Questions 31-60 of 399

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 2 (Q31-60)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
31. $Which of the elements possess only one electron in 5 d -orbital?$ (1) $^{69} Tm,^{61} Pm$ (2) $^{59} Pr,^{71} Lu$ (3) $^{57} La,^{61} Pm$ (4) $^{57} La,^{71} Lu$ 32. $Given below are two statements: Statement (I) : In the Lanthanoids, the formation of Ce^{+ 4} is favoured by its noble gas configuration. Statement (II) : Ce^{+ 4} is a strong oxidant reverting to the common +3 state. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are false$ 33. $The IUPAC name of the complex ion formed when gold dissolves in aqua regia is$ (1) $tetrachloridoaurate (III)$ (2) $tetrachloridoaurate (I)$ (3) $tetrachloridoaurate (II)$ (4) $dichloridoaurate (III).$ 34. $Which of the following pairs has the same size ?$ (1) $Fe2+, Ni2+$ (2) $Zr4+, Ti4+$ (3) $Zr4+, Hƒ4+$ (4) $Zn4+, Hƒ4+$ 35. $NaCl reacts with conc. H_{2} SO_{4} and K_{2} Cr_{2} O_{7} to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ;$ (1) $CrO_{2} Cl_{2}, Na_{2} CrO_{4}$ (2) $Na_{2} CrO_{4}, CrO_{2} Cl_{2}$ (3) $CrO_{2} Cl_{2}, KHSO_{4}$ (4) $CrO_{2} Cl_{2}, Na_{2} Cr_{2} O_{7}$ 36. $The correct order of the first ionization enthalpies is:$ (1) $Ti<Mn< Zn < Ni$ (2) $Ti<Mn< Ni < Zn$ (3) $Mn<Ti< Zn < Ni$ (4) $Zn < Ni <Mn<Ti$ 37. $Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?$ (1) $It will not prefer to undergo redox reactions.$ (2) $It will prefer to gain electron and act as an oxidizing agent$ (3) $It will prefer to give away an electron and behave as reducing agent$ (4) $It acts as both, oxidizing and reducing agent.$ 38. $Which of the following pair of compounds is expected to exhibit same colour in aqueous solution ?$ (1) $F e C l_{3}, C u C l_{2}$ (2) $V O C l_{2}, C u C l_{2}$ (3) $V O C l_{2}, F e C l_{2}$ (4) $F e C l_{2}, M n C l_{2}$ 39. $Which of the following oxidation states is the most common among the lanthanoids?$ (1) $4$ (2) $2$ (3) $5$ (4) $3$ 40. $The maximum number of possible oxidation states of actinoides are shown by:$ (1) $Nobelium (No) and lawrencium (Lr)$ (2) $Actinium (Ac) and thorium (Th)$ (3) $Berkelium (Bk) and californium (Cf)$ (4) $Neptunium (Np) and plutonium (Pu)$ 41. $Identify the oxidation states of titanium (Z = 22) and copper (Z = 29) in their colourless compounds.$ (1) $Ti^{3 +}, Cu^{2 +}$ (2) $Ti^{2 +}, Cu^{2 +}$ (3) $Ti^{4 +}, Cu^{1 +}$ (4) $Ti^{4 +}, Cu^{2 +}$ 42. $Which of the following lanthanoid ions is diamagnetic ? (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)$ (1) $Sm2+$ (2) $Eu2+$ (3) $Yb2+$ (4) $Ce2+$ 43. $KMnO_{4} oxidises S_{2} O_{3}^{2 -} to SO_{4}^{2 -} in medium x and NO_{2}^{-} to NO_{3}^{-} in medium y, x and y are respectively$ (1) $acidic, basic$ (2) $acidic, acidic$ (3) $acidic, neutral$ (4) $neutral, acidic$ 44. $A first row transition metal ( M ) does not liberate H_{2} gas from dilute HCl .1 mol of aqueous solution of MSO_{4} is treated with excess of aqueous KCN and then H_{2} S (g) is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is____mol.$ (1) $0$ (2) $3$ (3) $1$ (4) $2$ 45. $Which one of the following statements related to lanthanons is incorrect$ (1) $Europium shows + 2 oxidation state.$ (2) $The basicity decreases as the ionic radius decreases from P r to Lu.$ (3) $All the lanthanons are much more reactive than aluminium.$ (4) $C e_{(} + 4_{)} solutions are widely used as oxidizing agent in volumetric analysis.$ 46. $The number of d-electrons retained in F e^{2 +} (At. no. Fe = 26) ions are :$ (1) $3$ (2) $4$ (3) $5$ (4) $6$ 47. $Identify the set of paramagnetic ions among the following :$ (1) $Ni^{2 +}, Cu^{2 +}, Zn^{2 +}$ (2) $Sc^{3 +}, Ti^{3 +}, V^{3 +}$ (3) $Ti^{3 +}, Cu^{2 +}, Mn^{3 +}$ (4) $V^{2 +}, Co^{2 +}, Ti^{4 +}$ 48. $Which one of the following is not coloured ?$ (1) $Cu2+$ (2) $Cu+$ (3) $Ni2+$ (4) $Fe3+$ 49. $The correct order of following 3d metal oxides, according to their oxidation numbers is: (A) C r O_{3} (B) F e_{2} O_{3} (C) M n O_{2} (D) V_{2} O_{5} (E) C u_{2} O$ (1) $(D) > (A) > (B) > (C) > (E)$ (2) $(A) > (C) > (D) > (B) > (E)$ (3) $(A) > (D) > (C) > (B) > (E)$ (4) $(C) > (A) > (D) > (E) > (B)$ 50. $Which one of the following statements related to lanthanons is incorrect ?$ (1) $Ce (+4) solutions are widely used as oxidizing agent in volumetric analysis.$ (2) $Europium shows +2 oxidation state.$ (3) $The acidic nature decreases as the ionic radius decreases from Pr to Lu$ (4) $All the lanthanous are much more reactive than aluminium$ 51. $The "spin only" magnetic moment of Ni^{2 +} in aqueous solution would be [At No. of Ni = 28]$ (1) $6 B.M$ (2) $15 B.M$ (3) $2 B.M$ (4) $8 B.M$ 52. $Arrange the oxides CrO, CrO_{3} and Cr_{2} O_{3} in the decreasing order of acidic strength$ (1) $CrO_{3} > Cr_{2} O_{3} > CrO$ (2) $CrO_{3} > CrO > Cr_{2} O_{3}$ (3) $CrO > Cr_{2} O_{3} > CrO_{3}$ (4) $CrO > CrO_{3} > Cr_{2} O_{3}$ 53. $The amphoteric oxide among V_{2} O_{3}, V_{2} O_{4} and V_{2} O_{5}, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is:$ (1) $+3$ (2) $+4$ (3) $+7$ (4) $+5$ 54. $Given below are two statements: Statement I: Aqueous solution of K_{2} C r_{2} O_{7} is preferred as a primary standard in volumetric analysis over N a_{2} C r_{2} O_{7} aqueous solution. Statement II: K_{2} C r_{2} O_{7} has a higher solubility in water than N a_{2} C r_{2} O_{7} . In the light of the above statements, choose the correct answer from the options given below:$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are false$ 55. $The oxidation state of C r in K_{2} C r_{2} O_{7} is$ (1) $+ 5$ (2) $+ 3$ (3) $+ 6$ (4) $+ 7$ 56. $context of the lanthanoids, which of the following statement is not correct?$ (1) $There is a gradual decrease in the radii of the members with increasing atomic number in the series.$ (2) $All the member exhibit +3 oxidation state.$ (3) $Because of similar properties the separation of lanthanoids is not easy.$ (4) $Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.$ 57. $The number f-electrons in +3 oxidation state of gadolinium (Z = 64) is x and in +2 oxidation state of Ytterbium (Z = 70) is y . The sum of x and y is$ (1) $13$ (2) $20$ (3) $18$ (4) $21$ 58. $The pair of metal ions that can give a spin-only magnetic moment of 3.9 BM for the complex$ (1) $C r^{2 +} and M n^{2 +}$ (2) $V^{2 +} and C o^{2 +}$ (3) $V^{2 +} and F e^{2 +}$ (4) $C o^{2 +} and F e^{2 +}$ 59. $The metal ions that have the calculated spin only magnetic moment value of 4.9 B.M. are : (A) Cr^{2 +} (B) Fe^{2 +} (C) Fe^{3 +} (D) Co^{2 +} (E) Mn^{3 +} Choose the correct answer from the options given below:$ (1) $A, D and E Only$ (2) $A, B and E Only$ (3) $A, C and E Only$ (4) $B and E Only$ 60. $What is the oxidation state of Cr, when the pH of the aqueous solution of potassium dichromate changes from acidic to basic?$ (1) $+5$ (2) $+4$ (3) $+6$ (4) $+3$