d- and f-Block Elements PYQs Set 13 (PDF)

Set 13 of 14 · Questions 361-390 of 399

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Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 13 (Q361-390)
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361. $Which of the following element is responsible for oxidation of water to O_{2} in biological processes?$ (1) $Cu$ (2) $Mo$ (3) $Fe$ (4) $Mn$ 362. $Magnetic moment 2.83 BM is given by which of the following ions? (At.nos.Ti=22,Cr=24, Mn=25, Ni=28)$ (1) $Ti3+$ (2) $Ni2+$ (3) $Cr3+$ (4) $Mn2+$ 363. $The transition metal ions responsible for color in ruby and emerald are, respectively$ (1) $C r^{3 +} and C r^{3 +}$ (2) $C o^{3 +} and C o^{3 +}$ (3) $C o^{3 +} and C r^{3 +}$ (4) $C r^{3 +} and C o^{3 +}$ 364. $The electronic configuration of_{59} Pr (praseodimium) is$ (1) $(_{54} Xe) 4 f^{2} 5 d^{1} 6 s^{2}$ (2) $(_{54} Xe) 4 f^{1} 5 d^{1} 6 s^{2}$ (3) $(_{54} Xe) 4 f^{3} 6 s^{2}$ (4) $(_{54} Xe) 4 f^{3} 5 d^{2}$ 365. $The transition element that has lowest enthalpy of atomisation, is:$ (1) $V$ (2) $Fe$ (3) $Zn$ (4) $Cu$ 366. $The electronic configuration of Gd^{2 +} is (at. no. of Gd is 64)$ (1) $[Xe] 4 f^{7}$ (2) $[Xe] 4 f^{7} 5 d^{I}$ (3) $[Xe] 4 f^{8}$ (4) $[Xe] 4 f^{7} 5 d^{1} 6 s^{2}$ 367. $Which of the following exhibit only + 3 oxidation state ?$ (1) $U$ (2) $Th$ (3) $Ac$ (4) $Pa$ 368. $Identify the element for which electronic configuration in +3 oxidation state is [A r]^{3} d^{5} :$ (1) $Ru$ (2) $Mn$ (3) $Co$ (4) $Fe$ 369. $The elements in which electrons are progressively filled in 4 f orbital are called$ (1) $actinoids$ (2) $transition elements$ (3) $lanthanoids$ (4) $halogens.$ 370. $The correct order of decreasing second ionization enthalpy of Ti (22), V (23), Cr (24) and Mn (25) is :$ (1) $Cr > Mn > V > Ti$ (2) $V > Mn > Cr > Ti$ (3) $Mn > Cr > Ti > V$ (4) $Ti > V > Cr > M$ 371. $The percentage of lanthanides and iron, respectively, in misch metal are$ (1) $50,50$ (2) $75,25$ (3) $90,10$ (4) $95,5$ 372. $Chloro compound of Vanadium has only spin magnetic moment of 1.73 BM. This Vanadium chloride has the formula : (at. no. of V = 23)$ (1) $V C l_{2}$ (2) $V C l_{4}$ (3) $V C l_{3}$ (4) $V C l_{5}$ 373. $Which of the following configuration is correct for iron$ (1) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{7}$ (2) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5}$ (3) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5}$ (4) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{6}$ 374. $Which of the following forms a colourless solution in aqueous medium?$ (1) $Cr^{3 +}$ (2) $V^{3 +}$ (3) $Sc^{3 +}$ (4) $Ti^{3 +}$ 375. $Gadolinium belongs to 4 f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium7$ (1) $[X e] 4 f^{9} 5 s^{1}$ (2) $[X e] 4 f^{7} 5 d^{1} 6 s^{2}$ (3) $[X e] 4 f^{6} 5 d^{2} 6 s^{2}$ (4) $[X e] 4 f^{8} 6 d^{2}$ 376. $Copper becomes green when exposed to moist air for a long period. This is due to :$ (1) $the formation of a layer of cupric oxide on the surface of copper.$ (2) $the formation of a layer of basic carbonate of copper on the surface of copper.$ (3) $the formation of a layer of cupric hydroxide on the surface of copper.$ (4) $the formation of basic copper sulphate layer on the surface of the metal.$ 377. $Which of the following oxidation states is common for all lanthanides?$ (1) $+2$ (2) $+3$ (3) $+4$ (4) $+5$ 378. $Match the catalyst with the process: Catalyst Process (i) V_{2} O_{5} (p) The oxidation of ethyne to ethanal (ii) T i C l_{4} + A l (C H_{3})_{3} (q) Polymerisation of alkynes (iii) P d C l_{2} (r) Oxidation of S O_{2} in the manufacture of H_{2} S O_{4} (iv) Nickel complexes (s) Polymerisation of ethylene Which of the following is the correct option?.$ (1) $(i) - (r), (ii) - (s), (iii) - (p), (i v) - (q)$ (2) $(i) - (p), (ii) - (q), (iii) - (r), (i v) - (s)$ (3) $(i) - (p), (ii) - (r), (iii) - (q), (i v) - (s)$ (4) $(i) - (r), (ii) - (p), (iii) - (s), (i v) - (q)$ 379. $A white crystalline salt A reacts with dilute HCl to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute H_{2} SO_{4} to a green coloured solution C, A, B and C are respectively$ (1) $Na_{2} SO_{3}, SO_{2}, Cr_{2} (SO_{4})_{3}$ (2) $Na_{2} S_{2} O_{3}, SO_{2}, Cr_{2} (SO_{4})_{3}$ (3) $Na_{2} S, SO_{2}, Cr_{2} (SO_{4})_{3}$ (4) $Na_{2} SO_{4}, SO_{2}, Cr_{2} (SO_{4})_{3}$ 380. $Which of the following statements is wrong?$ (1) $In highest oxidation states, the transition metals show acidic character.$ (2) $Mn^{3 +} and Co^{3 +} are oxidising agents in aqueous solution.$ (3) $Metals in highest oxidation states are more stable in oxides than in fluorides.$ (4) $All elements of 3 d series exhibit variable oxidation states.$ 381. $a MnO_{4}^{-} + b S_{2} O_{3}^{2 -} + H_{2} O \to x MnO_{2} + y SO_{4}^{2 -} + z OH^{-} a and y respectively are$ (1) $8; 3$ (2) $8; 6$ (3) $3; 6$ (4) $8; 8$ 382. $When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH_{3} to give an explosive compound (C). The compounds A, B and C are$ (1) $A = MnO_{2}, B = Cl_{2}, C = NCl_{3}$ (2) $A = MnO, B = Cl_{2}, C = NH_{3} Cl$ (3) $A = Mn_{3} O_{4}, B = Cl_{2}, C = NCl_{3}$ (4) $A = MnO_{3}, B = Cl_{2}, C = NCl_{2}$ 383. $Highest oxidation state of Mn is exhibited in M n_{2} O_{7} . The correct statements about M n_{2} O_{7} are (A) Mn is tetrahedrally surrounded by oxygen atoms (B) Mn is octahedrally surrounded by oxygen atoms (C) Contains Mn-O-Mn bridge (D) Contains Mn-Mn bond. Choose the correct answer from the options given below$ (1) $A and C only$ (2) $A and D only$ (3) $B and D only$ (4) $B and C only$ 384. $Number of electrons transferred in each case when K M n O_{4} acts as an oxidising agent to give M n O_{2}, M n^{2 +}, Mn (O H)_{3} and MnO_{4}^{2-} are respectively :$ (1) $3, 5, 4 and 1$ (2) $4, 3, 1 and 5$ (3) $1, 3, 4 and 5$ (4) $5, 4, 3 and 1$ 385. $When X O_{2} is fused with an alkali metal hydroxide in presence of an oxidizing agent such as K N O_{3}; a dark green product is formed which disproportioates in acidic solution to afford a dark purple solution. X is :$ (1) $Mn$ (2) $Cr$ (3) $V$ (4) $Ti$ 386. $During the qualitative analysis of S O_{3}^{2 -} using dilute H_{2} S O_{4}, S O_{2} gas is evolved which turns K_{2} C r_{2} O_{7} solution (acidified with dilute H_{2} S O_{4}):$ (1) $Black$ (2) $Red$ (3) $Green$ (4) $Blue$ 387. $For the reaction, Cr_{2} O_{7}^{2 -} pH = x CrO_{4}^{2 -} pH = y Cr_{2} O_{7}^{2 -} pH values 'x' and 'y' can be$ (1) $4 and 5$ (2) $4 and 8$ (3) $8 and 4$ (4) $8 and 9$ 388. $Preparation of potassium permanganate from MnO_{2} involves two step process in which the 1st step is a reaction with KOH and KNO_{3} to produce$ (1) $K_{3} MnO_{4}$ (2) $K_{4} (Mn (OH)_{6})$ (3) $KMnO_{4}$ (4) $K_{2} MnO_{4}$ 389. $An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is ;$ (1) $C u^{2 +}$ (2) $C o^{2 +}$ (3) $Fe$ (4) $N i^{2 +}$ 390. $The manganate and permanganate ions are tetrahedral, due to:$ (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) $There is no π-bonding.$ (4) $The π-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese.$