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

Set 12 of 14 · Questions 331-360 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 12 (Q331-360)
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.
331. $Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given for Nd = 60,Yb = 70, La = 57,Ce = 58)$ (1) $Nd$ (2) $Yb$ (3) $La$ (4) $Ce$ 332. $The E u^{2 +} ion is a strong reducing agent in spite of its ground state electronic configuration (outermost): [Atomic number of Eu = 63]$ (1) $4 f^{7} 6 s^{2}$ (2) $4 f^{6}$ (3) $4 f^{7}$ (4) $4 f^{6} 6 s^{2}$ 333. $The highest possible oxidation states of uranium and plutonium, respectively, are :$ (1) $6 and 7$ (2) $6 and 4$ (3) $7 and 6$ (4) $4 and 6$ 334. $The statement that is incorrect about the interstitial compounds is:$ (1) $They are chemically reactive$ (2) $They are very hard$ (3) $They have metallic conductivity$ (4) $They have high melting points$ 335. $Mischmetal is an alloy consisting mainly of:$ (1) $lanthanoid and actinoid metals$ (2) $actinoid and transition metals$ (3) $lanthanoid metals$ (4) $actinoid metals$ 336. $The electronic configuration of gadolinium (Atomic No. = 64) is$ (1) $[X e] 4 f^{3} 5 d^{5} 6 s^{2}$ (2) $[X e] 4 f^{6} 5 d^{2} 6 s^{2}$ (3) $[X e] 4 f^{8} 5 d^{9} 6 s^{2}$ (4) $[X e] 4 f^{7} 5 d^{1} 6 s^{2}$ 337. $The transition elements have a general electronic configuration$ (1) $n s^{2} n p^{6} n d^{1 - 10}$ (2) $(n - 1) d^{1 - 10}, n s^{0 - 2}, n p^{0 - 6}$ (3) $(n - 1) d^{1 - 10}, n s^{1 - 2}$ (4) $n d^{1 - 10} n s^{- 2}$ 338. $The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour ?$ (1) $[Mn(H2O)6]2+$ (2) $[Fe(H2O)6]2+$ (3) $[Co(H2O)6]2+$ (4) $[Cr(H2O)6]2+$ 339. $Among the following, which is the strongest oxidizing agent ?$ (1) $M n^{3 +}$ (2) $F e^{3 +}$ (3) $T i^{3 +}$ (4) $C r^{3 +}$ 340. $Which one of the following nitrates will leaves behind a metal on strong heating ?$ (1) $Copper nitrate$ (2) $Manganese nitrate$ (3) $Silver nitrate$ (4) $Ferric nitrate$ 341. $0.05 MCuSO_{4} when treated with 0.01 MK_{2} Cr_{2} O_{7} gives green colour solution of Cu_{2} Cr_{2} O_{7} . The two solutions are separated as shown below : [SPM : Semi Permeable Membrane] Due to osmosis :$ (1) $Molarity of CuSO_{4} solution is lowered.$ (2) $Molarity of K_{2} Cr_{2} O_{7} solution is lowered.$ (3) $Green colour formation observed on side Y.$ (4) $Green colour formation observed on side X.$ 342. $What would happen when a solution of potassium chromate is treated with an excess of dilute H N O_{3} ?$ (1) $C r_{2} O_{7}^{2-} and H_{2} O are formed$ (2) $CrO_{4}^{2-} is reduced to +3 state of Cr$ (3) $CrO_{4}^{2-} is oxidised to +7 state of Cr$ (4) $C r^{3 +} and C r_{2} O_{7}^{2-} are formed$ 343. $Which one of the following statements is correct when S O_{2} is passed through acidified K_{2} C r_{2} O_{7} solution?$ (1) $S O_{2} is reduced.$ (2) $Green C r_{2} (S O_{4})_{3} is formed.$ (3) $The solution turns blue.$ (4) $The solution is decolourised.$ 344. $In which of the following compounds transition metal has zero oxidation state?$ (1) $N O C l O_{4}$ (2) $N H_{2} N H_{2}$ (3) $C r O_{5}$ (4) $[F e (C O)_{5}]$ 345. $Four successive members of the first series ofthe transition metals are listed below. For which one of them the standard potential (E_{M^{2 +} / M}^{o}) value has a positive sign?.$ (1) $C o_{(} Z = 2 7_{)}$ (2) $N i_{(} Z = 2 8_{)}$ (3) $C u_{(} Z = 2 9_{)}$ (4) $F e_{(} Z = 2 6_{)}$ 346. $In neutral or faintly alkaline medium, K M n O_{4} being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :$ (1) $5$ (2) $1$ (3) $0$ (4) $3$ 347. $In the structure of the dichromate ion, there is a :$ (1) $linear symmetrical Cr - O - Cr bond.$ (2) $non-linear symmetrical Cr - O - Cr bond.$ (3) $linear unsymmetrical Cr - O - Cr bond.$ (4) $non-linear unsymmetrical Cr - O - Cr bond.$ 348. $Which of the following statements is false ?$ (1) $N a_{2} C r_{2} O_{7} is less soluble than K_{2} C r_{2} O_{7}$ (2) $N a_{2} C r_{2} O_{7} is primary standard in volumetry$ (3) $Cr O_{4}^{2 -} is tetrahedral in shape$ (4) $C r_{2} O_{7}^{2 -} has a Cr-O-Cr bond$ 349. $The correct order of atomic radii is:$ (1) $N>Ce>Eu>Ho$ (2) $Ho>N>Eu>Ce$ (3) $Ce>Eu>Ho>N$ (4) $Eu>Ce>Ho>N$ 350. $Dihydrogen reacts with CuO to give$ (1) $C u H_{2}$ (2) $Cu$ (3) $C u_{2} O$ (4) $Cu (O H)_{2}$ 351. $Which is least stable in aqueous medium$ (1) $F e^{+ 2}$ (2) $C o^{+ 2}$ (3) $N i^{+ 2}$ (4) $M n^{+ 2}$ 352. $When sulphur dioxide is passed in an acidified K_{2} Cr_{2} O_{7} solution, the oxidation state of sulphur is changed from$ (1) $+4 to +6$ (2) $+6 to +4$ (3) $+4 to 0$ (4) $+4 to +2$ 353. $The catalytic activity of transition metals and their compounds is ascribed mainly to$ (1) $their magnetic behaviour$ (2) $their unfilled d ‐orbitals$ (3) $their ability to adopt variable oxidation states$ (4) $their chemical reactivity$ 354. $Silver iodide is used for producing artificial rain because AgI$ (1) $is easy to spray at high altitude$ (2) $is easy to synthesize$ (3) $has crystal structure similar to ice$ (4) $is insoluble in water.$ 355. $Which of the following has the maximum number of unpaired d electrons?$ (1) $Ni^{3 +}$ (2) $Cu^{+}$ (3) $Zn^{2 +}$ (4) $Fe^{2 +}$ 356. $MSO_{4} \to NH_{4} OH X ↓ \to NH_{4} OH Excess white Y \to H_{2} S ZL Here M and Z are$ (1) $Zn, ZnS$ (2) $Al, Al_{2} S_{3}$ (3) $Cu, ZnS$ (4) $Fe, FeS$ 357. $The only radioactive element among the lanthanoids is$ (1) $gadolinium$ (2) $holmium$ (3) $promethium$ (4) $neodymium.$ 358. $Aqueous solution of a salt (A) forms a dense white precipitate with BaCl_{2} solution. The precipitate dissolves in dilute HCl to produce a gas (B) which decolourises acidified KMnO_{4} solution. A and B respectively are$ (1) $BaSO_{4}, H_{2} S$ (2) $BaSO_{4}, SO_{2}$ (3) $BaSO_{3}, H_{2} S$ (4) $BaSO_{3}, SO_{2}$ 359. $The number of element from the following that do not belong to lanthanoids is Eu, Cm, Er, Tb, Yb and Lu$ (1) $3$ (2) $4$ (3) $1$ (4) $5$ 360. $Which one of the following exhibits the largest number of oxidation states?$ (1) $Ti (22)$ (2) $V(23)$ (3) $Cr (24)$ (4) $Mn (25)$