d- and f-Block Elements PYQs Set 12 (PDF)

Set 12 of 15 · Questions 331-360 of 443

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Mere Teacher · Previous Year Questions JEE Main Chemistry · d- and f-Block Elements · Set 12 (Q331-360)
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331. $Diamagnetic Lanthanoid ions are:$ (1) $Nd^{3 +} and Eu^{3 +}$ (2) $La^{3 +} and Ce^{4 +}$ (3) $Nd^{3 +} and Ce^{4 +}$ (4) $Lu^{3 +} and Eu^{3 +}$ 332. $Lanthanides are :$ (1) $14 elements in the sixth period (At. No. 90 to 103) that are filling 4f sublevel.$ (2) $14 elements in the seventh period (At. No. 90 to 103) that are filling 5f subshell.$ (3) $14 elements in the sixth period (At. No. 58 to 71) that are filling the 4f subshell$ (4) $14 elements in the seventh period (At. No. 58 to 71) that are filling the 4f subshell.$ 333. $Mercury is a liquid metal because$ (1) $it has a completely filled d -orbital that prevents d - d overlapping of orbitals$ (2) $it has a completely filled d -orbital that causes d - d overlapping$ (3) $it has a completely filled s -orbital$ (4) $it has a small atomic size.$ 334. $Which of the following statements are incorrect? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in Sc_{2} O_{3} to Mn_{2} O_{7} . C. Basic character increases from V_{2} O_{3} to V_{2} O_{4} to V_{2} O_{5} . D. V_{2} O_{4} dissolves in acids to give VO_{4}^{3 -} salts. E. CrO is basic but Cr_{2} O_{3} is amphoteric. Choose the correct answer from the options given below:$ (1) $B and C only$ (2) $A and E only$ (3) $B and D only$ (4) $C and D only$ 335. $Which of the following statements are correct about Zn, Cd and Hg ? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. Zn and Cd do not show variable oxidation state while Hg shows + I and + II. C. Compounds of Zn, Cd and Hg are paramagnetic in nature. D. Zn, Cd and Hg are called soft metals. Choose the most appropriate from the options given below:$ (1) $B, D only$ (2) $B, C only$ (3) $A, D only$ (4) $C, D only$ 336. $The colour of KMnO4 is due to :$ (1) $M \to L charge transfer transition$ (2) $d - d transition$ (3) $L \to M charge transfer transition$ (4) $σ - σ* transition$ 337. $Identify the incorrect statement.$ (1) $The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.$ (2) $Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.$ (3) $The oxidation states of chromium in CrO_{4}^{2 -} and Cr_{2} O_{7}^{2 -} are not the same.$ (4) $Cr^{2 +} (d^{4}) is a stronger reducing agent than Fe^{2 +} (d^{6}) in water.$ 338. $Which one of these is not known?$ (1) $CuCl_{2}$ (2) $CuF_{2}$ (3) $CuI_{2}$ (4) $CuBr_{2}$ 339. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In aqueous solutions Cr^{2 +} is reducing while Mn^{3 +} is oxidising in nature. Reason (R) : Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration. In the light of the above statement, choose the most appropriate answer from the options given below:$ (1) $Both (A) and (R) are true and (R) is the correct explanation of (A)$ (2) $Both (A) and (R) are true but (R) is not the correct explanation of (A)$ (3) $(A) is false but (R) is true$ (4) $(A) is true but (R) is false$ 340. $The colour of K M n O_{4} is due to :$ (1) $M \to L charge transfer transition$ (2) $d - d transition$ (3) $L \to M charge transfer transition$ (4) $σ - σ* transition$ 341. $In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively, are S_{2} O_{3}^{2 -} A g^{+} Clear solution X A g^{+} white precipitate Y with time black precipitate Y$ (1) $[Ag (S_{2} O_{3})_{2}]^{3 -}, A g_{2} S_{2} O_{3}, A g_{2} S$ (2) $[Ag(S_{2} O_{3})_{3}]^{5-}, A g_{2} S O_{3}, A g_{2} S$ (3) $[Ag(S O_{3})_{2}]^{3-}, A g_{2} S_{2} O_{3}, Ag$ (4) $[Ag(S O_{3})_{3}]^{3-}, A g_{2} S O_{4},Ags$ 342. $Which of the following statements about the interstitial compounds is incorrect?$ (1) $They are much harder than the pure metal.$ (2) $They have higher melting points than the pure metal.$ (3) $They retain metallic conductivity.$ (4) $They are chemically reactive.$ 343. $Hypo is used in photography to$ (1) $reduce AgBr grains to metallic silver$ (2) $convert metallic silver to silver salt$ (3) $remove undecomposed silver bromide as a soluble complex$ (4) $remove reduced silver.$ 344. $Incorrect statement with reference to Ce (Z = 58) .$ (1) $Ce^{4 +} is a reducing agent.$ (2) $Ce in +3 oxidation state is more stable than in +4 .$ (3) $Atomic size of Ce is more than that of Lu.$ (4) $Ce shows common oxidation states of +3 and +4 .$ 345. $A solution of FeCl3 when treated with K_{4} [Fe (C N)_{6}] gives a prussiun blue precipitate due to the formation of$ (1) $K[F e_{2} (C N)_{6}]$ (2) $Fe[Fe (C N)_{6}]$ (3) $F e_{3} [Fe(CN)_{6}]_{2}$ (4) $F e_{4} [Fe(CN)_{6}]_{3}$ 346. $The reaction of H_{2} O_{2} with potassium permanganate in acidic medium leads to the formation of mainly:$ (1) $M n^{2 +}$ (2) $M n^{4 +}$ (3) $M n^{3 +}$ (4) $M n^{6 +}$ 347. $What is the general molecular formula of the products obtained on heating lanthanoids (Ln) with sulphur?$ (1) $LnS$ (2) $LnS_{3}$ (3) $Ln_{3} S_{2}$ (4) $Ln_{2} S_{3}$ 348. $Which one amongst the following are good oxidizing agents? A. S m^{2 +} B. C e^{2 +} C. C e^{4 +} D. T b^{4 +} Choose the most appropriate answer from the options given below :$ (1) $C only$ (2) $D only$ (3) $A and B only$ (4) $C and D only$ 349. $Which of the following processes does not involve oxidation of iron?$ (1) $Formation of F e (C O)_{5} from Fe.$ (2) $Liberation of H_{2} from steam by iron at high temperature.$ (3) $Rusting of iron sheets.$ (4) $Decolourisation of blue C u S O_{4} solution by iron.$ 350. $The product of oxidation of I^{-} with MnO_{4}^{-} in alkaline medium is :$ (1) $ΙO3-$ (2) $Ι2$ (3) $ΙO-$ (4) $ΙO4-$ 351. $The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are$ (1) $M n^{4 +}, H_{2} O only$ (2) $M n^{2 +}, H_{2} O only$ (3) $M n^{4 +}, H_{2} O, O_{2} only$ (4) $M n^{2 +}, H_{2} O, O_{2} only$ 352. $The nature of oxides V_{2} O_{3} and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is:$ (1) $X=basic Y=amphoteric$ (2) $X=amphoteric Y=basic$ (3) $X=acidic Y=acidic$ (4) $X=basic Y=basic$ 353. $The element that usually does not show variable oxidation states is:$ (1) $Cu$ (2) $Ti$ (3) $Sc$ (4) $V$ 354. $Which of the following is correct with respect to melting point of a transition element?$ (1) $V > Cr$ (2) $Cr > Mn$ (3) $Mn > Fe$ (4) $Ti > V$ 355. $The catalytic activity of transition metals and their compounds is ascribed mainly to :$ (1) $their magnetic behaviour$ (2) $their unfilled d-orbitals$ (3) $their ability to adopt variable oxidation state$ (4) $their chemical reactivity$ 356. $In the given chemical reaction, colors of the F e^{2 +} and F e^{3 +} ions, are respectively : 5 F e^{2 +} + M n O_{4}^{-} + 8 H^{+} \to M n^{2 +} + 4 H_{2} O + 5 F e^{3 +}$ (1) $Yellow, Orange$ (2) $Yellow, Green$ (3) $Green, Orange$ (4) $Green, Yellow$ 357. $The only lanthanoid which is radioactive$ (1) $promethium$ (2) $praseodymium$ (3) $lanthanum$ (4) $cerium.$ 358. $Consider the following reactions: NaCl + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to (A) + side products (conc.) (A) + NaOH \to (B) + Side products (B) + H_{2} S O_{4} + H_{2} O_{2} \to (C) + Side products (dilute) The sum of the total number of atoms in one molecule each of (A), (B) and (C) is______$ (1) $18$ (2) $32$ (3) $36$ (4) $12$ 359. $Given below are two statements : Statement (I) : The 4 f and 5 f - series of elements are placed separately in the Periodic table to preserve the principle of classification. Statement (II) :S-block elements can be found in pure form in nature. In the light of the above statements, choose the most appropriate answer from the options given below :$ (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) $Both Statement I and Statement II are false$ 360. $A transition metal ' M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spinonly magnetic moment value of M^{+} ion is__________BM (Near integer) (Given atomic number Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)$