d- and f-Block Elements PYQs Set 10 (PDF)

Set 10 of 14 · Questions 271-300 of 399

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Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 10 (Q271-300)
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271. $When C u S O_{4} is electrolysed using platinum electrodes,$ (1) $copper is liberated at cathode, sulphur at anode$ (2) $copper is liberated at cathode, oxygen at anode$ (3) $sulphur is liberated at cathode, oxygen at anode$ (4) $oxygen is liberated at cathode, copper at anode.$ 272. $A transition element X has a configuration [Ar] 3 d^{4} in its + 3 oxidation state. Its atomic number is$ (1) $22$ (2) $19$ (3) $25$ (4) $26$ 273. $The metal ion (in gaseous state) with lowest spin-only magnetic moment value is$ (1) $V^{2 +}$ (2) $N i^{2 +}$ (3) $C r^{2 +}$ (4) $F e^{2 +}$ 274. $K M n O_{4} reacts with oxalic acid according to the equation 2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O Here 20 m L of 0.1 M K M n O_{4} is equivalent to$ (1) $50 m L of 0.5 M C_{2} H_{2} O_{4}$ (2) $20 m L of 0.1 M C_{2} H_{2} O_{4}$ (3) $20 m L of 0.5 M C_{2} H_{2} O_{4}$ (4) $50 m L of 0.1 M C_{2} H_{2} O_{4}$ 275. $Which of the following ions has electronic configuration [Ar] 3 d^{6} ?$ (1) $N i^{3 +}$ (2) $M n^{3 +}$ (3) $F e^{3 +}$ (4) $C o^{3 +} (At. nos. M n = 25, F e = 26, C o = 27, N i = 28)$ 276. $The manganate and permanganate ions are tetrahedral, due to$ (1) $the π ‐bonding involves overlap of d ‐orbitals of oxygen with d ‐orbitals of manganese$ (2) $the π ‐bonding involves overlap of p ‐orbitals of oxygen with d ‐orbitals of manganese$ (3) $there is no n ‐bonding$ (4) $the n ‐bonding involves overlap of p ‐orbitals of oxygen with p ‐orbitals of manganese.$ 277. $When permangnate ion is heated at 513 K, led to the formation of two manganese based products. The physical properties of the product in which manganese with the higher oxidation state than the other are$ (1) $Diamagnetic and colourless$ (2) $Paramagnetic and colourless$ (3) $Paramagnetic and green$ (4) $Diamagnetic and green$ 278. $The number of moles of K M n O_{4} reduced by one mole of KI in alkaline medium is$ (1) $one$ (2) $two$ (3) $five$ (4) $one fifth$ 279. $H g C l_{2} and 1_{2} both when dissolved in water containing I^{-} ions, the pair of species formed is$ (1) $H g I_{2}, I^{-}$ (2) $H g I_{4}^{2 -}, I_{3}^{-}$ (3) $H g_{2} I_{2}, I^{-}$ (4) $H g I_{2}, I_{3}^{-}$ 280. $When calomel reacts with N H_{4} O H, we get$ (1) $H g_{2} O$ (2) $H g O$ (3) $H g N H_{2} C l$ (4) $N H_{2} - H g - H g - C l$ 281. $A compound A is used in paints instead of salts of lead. Compound A is obtained when a white compound B is strongly heated. Compound B is insoluble in water but dissolves in NaOH solution forming a solution of compound C . The compound A on heating with coke gives a volatile metal D and a gas E which burns with a blue flame. Identify the possible species D and C can be respectively?$ (1) $D = Hg, C = Hg (OH)_{2}$ (2) $D = Cd, C = Na_{2} (CdO_{2})$ (3) $D = Zn, C = Na_{2} ZnO_{2}$ (4) $D = Zn, C = Zn (OH)_{2}$ 282. $The electronic configuration of Cr in Cr (CO)_{6} as calculated using crystal field theory is$ (1) $t_{2 g}^{4} e_{g}^{0}$ (2) $t^{3}_{2 g} e^{1}_{g}$ (3) $t_{2 g}^{6} e_{g}^{0}$ (4) $t_{2 g}^{4} e_{g}^{2}$ 283. $During the borax bead test with C u S O_{4}, a blue green colour of the bead was observed in oxidising flame due to the formation of$ (1) $C u_{3} B_{2}$ (2) $Cu$ (3) $Cu (B O_{2})_{2}$ (4) $CuO$ 284. $Acidified K_{2} C r_{2} O_{7} solution turns green when N a_{2} S O_{3} is added to it. This is due to the formation of$ (1) $C r_{2} (S O_{4})_{3}$ (2) $C r O_{4}^{2 -}$ (3) $C r_{2} (S O_{3})_{3}$ (4) $C r S O_{4}$ 285. $The reaction of aqueous K M n O_{4} with H_{2} O_{2} in acidic conditions gives$ (1) $M n^{4 +} and O_{2}$ (2) $M n^{2 +} and O_{2}$ (3) $M n^{2 +} and O_{3}$ (4) $M n^{4 +} and M n O_{2}$ 286. $Which one of the following species is stable in aqueous solution$ (1) $Mn O_{4}^{2 -}$ (2) $Mn O_{4}^{3 -}$ (3) $C u^{+}$ (4) $C r^{2 +}$ 287. $Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in$ (1) $T l^{+}, T l^{3 +}$ (2) $C u^{+}, C u^{2 +}$ (3) $C r^{2 +}, C r^{3 +}$ (4) $V^{2 +}, V O^{2 +}$ 288. $Consider the following statements about manganate and permanganate ions. Identify the correct statements.(A) The geometry of both manganate and permanganate ions is tetrahedral.(B) The oxidation states of Mn in manganate and permanganate are +7 and +6 , respectively.(C) Oxidation of Mn (II) salt by peroxodisulphate gives manganate ion as the final product.(D) Manganate ion is paramagnetic and permanganate ions is diamagnetic.(E) Acidified permanganate ion reduces oxalate, nitrite and iodide ions. Choose the correct answer from the options given below:$ (1) $(A) (C) and (D) Only$ (2) $(A) and (D) Only$ (3) $(A) (D) and (E) Only$ (4) $(A) (B) and (C) Only$ 289. $Given below are two statements: Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3 . (Sc^{3 +}, Ti^{3 +}), (Mn^{2 +}, Cr^{2 +}), (Cu^{2 +}, Zn^{2 +}) and (Ni^{2 +}, Ti^{4 +}) Statement II: Th^{4 +} is the strongest reducing agent among Th^{4 +}, Ce^{4 +}, Gd^{3 +} and Eu^{2 +} . In the light of the above statements, choose the correct answer from the options given below$ (1) $Both Statement I and Statement II are false$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is false but Statement II is true$ (4) $Statement I is true but Statement II is false$ 290. $Reason of lanthanoid contraction is$ (1) $negligible screening effect of f ’‐orbitals$ (2) $increasing nuclear charge$ (3) $decreasing nuclear charge$ (4) $decreasing screening effect.$ 291. $What among the following is coloured?$ (1) $CuCl$ (2) $ScCl_{3}$ (3) $CuCl_{2}$ (4) $TiCl_{4}$ 292. $The transition metals are mostly$ (1) $diamagnetic$ (2) $paramagnetic$ (3) $neither diamagnetic nor paramagnetic$ (4) $both diamagnetic and paramagnetic$ 293. $Identify the correct statement$ (1) $Yb^{2 +} is an oxidant$ (2) $Lu^{3 +} is paramagnetic$ (3) $CrO is basic$ (4) $Brass is an alloy of Cu, Sn$ 294. $Lanthanoids are$ (1) $14 elements in the sixth period (atomic no. 90 to 103) that are filling 4 f sublevel$ (2) $14 elements in the seventh period (atomic number = 90 to 103) that are filling 5 f sublevel$ (3) $14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4 f sublevel$ (4) $14 elements in the seventh period (atomic number = 50 to 71) that are filling 4 f sublevel.$ 295. $Diamagnetic Lanthanoid ions are:$ (1) $Nd^{3 +} and Eu^{3 +}$ (2) $La^{3 +} and Ce^{4 +}$ (3) $Nd^{3 +} and Ce^{4 +}$ (4) $Lu^{3 +} and Eu^{3 +}$ 296. $Lanthanides are :$ (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) $14 elements in the seventh period (At. No. 58 to 71) that are filling the 4f subshell.$ 297. $Mercury is a liquid metal because$ (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) $it has a small atomic size.$ 298. $Which of the following statements are incorrect? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in Sc_{2} O_{3} to Mn_{2} O_{7} . C. Basic character increases from V_{2} O_{3} to V_{2} O_{4} to V_{2} O_{5} . D. V_{2} O_{4} dissolves in acids to give VO_{4}^{3 -} salts. E. CrO is basic but Cr_{2} O_{3} is amphoteric. Choose the correct answer from the options given below:$ (1) $B and C only$ (2) $A and E only$ (3) $B and D only$ (4) $C and D only$ 299. $Which of the following statements are correct about Zn, Cd and Hg ? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. Zn and Cd do not show variable oxidation state while Hg shows + I and + II. C. Compounds of Zn, Cd and Hg are paramagnetic in nature. D. Zn, Cd and Hg are called soft metals. Choose the most appropriate from the options given below:$ (1) $B, D only$ (2) $B, C only$ (3) $A, D only$ (4) $C, D only$ 300. $The colour of KMnO4 is due to :$ (1) $M \to L charge transfer transition$ (2) $d - d transition$ (3) $L \to M charge transfer transition$ (4) $σ - σ* transition$