d- and f-Block Elements PYQs Set 11 (PDF)

Set 11 of 14 · Questions 301-330 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 11 (Q301-330)
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.
301. $Identify the incorrect statement.$ (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) $Cr^{2 +} (d^{4}) is a stronger reducing agent than Fe^{2 +} (d^{6}) in water.$ 302. $Which one of these is not known?$ (1) $CuCl_{2}$ (2) $CuF_{2}$ (3) $CuI_{2}$ (4) $CuBr_{2}$ 303. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In aqueous solutions Cr^{2 +} is reducing while Mn^{3 +} is oxidising in nature. Reason (R) : Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration. In the light of the above statement, choose the most appropriate answer from the options given below:$ (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) $(A) is true but (R) is false$ 304. $The colour of K M n O_{4} is due to :$ (1) $M \to L charge transfer transition$ (2) $d - d transition$ (3) $L \to M charge transfer transition$ (4) $σ - σ* transition$ 305. $In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively, are S_{2} O_{3}^{2 -} A g^{+} Clear solution X A g^{+} white precipitate Y with time black precipitate Y$ (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) $[Ag(S O_{3})_{3}]^{3-}, A g_{2} S O_{4},Ags$ 306. $Which of the following statements about the interstitial compounds is incorrect?$ (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) $They are chemically reactive.$ 307. $Hypo is used in photography to$ (1) $reduce AgBr grains to metallic silver$ (2) $convert metallic silver to silver salt$ (3) $remove undecomposed silver bromide as a soluble complex$ (4) $remove reduced silver.$ 308. $Incorrect statement with reference to Ce (Z = 58) .$ (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) $Ce shows common oxidation states of +3 and +4 .$ 309. $A solution of FeCl3 when treated with K_{4} [Fe (C N)_{6}] gives a prussiun blue precipitate due to the formation of$ (1) $K[F e_{2} (C N)_{6}]$ (2) $Fe[Fe (C N)_{6}]$ (3) $F e_{3} [Fe(CN)_{6}]_{2}$ (4) $F e_{4} [Fe(CN)_{6}]_{3}$ 310. $The reaction of H_{2} O_{2} with potassium permanganate in acidic medium leads to the formation of mainly:$ (1) $M n^{2 +}$ (2) $M n^{4 +}$ (3) $M n^{3 +}$ (4) $M n^{6 +}$ 311. $What is the general molecular formula of the products obtained on heating lanthanoids (Ln) with sulphur?$ (1) $LnS$ (2) $LnS_{3}$ (3) $Ln_{3} S_{2}$ (4) $Ln_{2} S_{3}$ 312. $Which one amongst the following are good oxidizing agents? A. S m^{2 +} B. C e^{2 +} C. C e^{4 +} D. T b^{4 +} Choose the most appropriate answer from the options given below :$ (1) $C only$ (2) $D only$ (3) $A and B only$ (4) $C and D only$ 313. $Which of the following processes does not involve oxidation of iron?$ (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) $Decolourisation of blue C u S O_{4} solution by iron.$ 314. $The product of oxidation of I^{-} with MnO_{4}^{-} in alkaline medium is :$ (1) $ΙO3-$ (2) $Ι2$ (3) $ΙO-$ (4) $ΙO4-$ 315. $The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are$ (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) $M n^{2 +}, H_{2} O, O_{2} only$ 316. $The nature of oxides V_{2} O_{3} and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is:$ (1) $X=basic Y=amphoteric$ (2) $X=amphoteric Y=basic$ (3) $X=acidic Y=acidic$ (4) $X=basic Y=basic$ 317. $The element that usually does not show variable oxidation states is:$ (1) $Cu$ (2) $Ti$ (3) $Sc$ (4) $V$ 318. $Which of the following is correct with respect to melting point of a transition element?$ (1) $V > Cr$ (2) $Cr > Mn$ (3) $Mn > Fe$ (4) $Ti > V$ 319. $The catalytic activity of transition metals and their compounds is ascribed mainly to :$ (1) $their magnetic behaviour$ (2) $their unfilled d-orbitals$ (3) $their ability to adopt variable oxidation state$ (4) $their chemical reactivity$ 320. $In the given chemical reaction, colors of the F e^{2 +} and F e^{3 +} ions, are respectively : 5 F e^{2 +} + M n O_{4}^{-} + 8 H^{+} \to M n^{2 +} + 4 H_{2} O + 5 F e^{3 +}$ (1) $Yellow, Orange$ (2) $Yellow, Green$ (3) $Green, Orange$ (4) $Green, Yellow$ 321. $The only lanthanoid which is radioactive$ (1) $promethium$ (2) $praseodymium$ (3) $lanthanum$ (4) $cerium.$ 322. $Consider the following reactions: NaCl + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to (A) + side products (conc.) (A) + NaOH \to (B) + Side products (B) + H_{2} S O_{4} + H_{2} O_{2} \to (C) + Side products (dilute) The sum of the total number of atoms in one molecule each of (A), (B) and (C) is______$ (1) $18$ (2) $32$ (3) $36$ (4) $12$ 323. $Given below are two statements : Statement (I) : The 4 f and 5 f - series of elements are placed separately in the Periodic table to preserve the principle of classification. Statement (II) :S-block elements can be found in pure form in nature. In the light of the above statements, choose the most appropriate answer from the options given below :$ (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) $Both Statement I and Statement II are false$ 324. $The electronic configurations of bivalent europium and trivalent cerium are respectively : (atomic number : Xe = 54, Ce = 58, Eu = 63)$ (1) $[Xe] 4 f^{4} and [Xe] 4 f^{9}$ (2) $[Xe] 4 f^{7} and [Xe] 4 f^{1}$ (3) $[Xe] 4 f^{7} 6 s^{2} and [Xe] 4 f^{2} 6 s^{2}$ (4) $[Xe] 4 f^{2} and [Xe] 4 f^{7}$ 325. $Which element is not present in Nessler's reagent ?$ (1) $Mercury$ (2) $Potassium$ (3) $Iodine$ (4) $Oxygen$ 326. $Which of the following processes does not involve oxidation of iron ?$ (1) $Decolourization of blue CuSO4 solution by iron$ (2) $Formation of Fe (CO)5 from Fe$ (3) $Liberation of H2 from steam by iron at high temperature$ (4) $Rusting of iron sheets$ 327. $Match the following: Column-I (Reaction) A. 4 FeCl_{3} + 3 K_{4} (Fe (CN)_{6}) \to B. ZnCl_{2} + 4 NaOH \to C. 2 FeCl_{3} + H_{2} S \to Column-II (Main product) 1. Fe_{4} (Fe (CN)_{6})_{3} 2. FeCl_{2} 3. Zn (OH) Cl 4. Fe_{3} (Fe (CN)_{6})_{3} 5. Na_{2} ZnO_{2} 6. FeS The correct match is Codes: A B C$ (1) $136$ (2) $152$ (3) $452$ (4) $436$ 328. $Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii?. (Numbers in the parenthesis are atomic numbers)$ (1) $Z r_{(} 4 0_{)} and H f_{(} 7 2_{)}$ (2) $Z r_{(} 4 0_{)} and Ta (73)$ (3) $Ti (22) andZr(40)$ (4) $Zr(40)and Nb (41)$ 329. $The 7 1^{s t} electron of an element X with an atomic number of 71 enters into the orbital:$ (1) $6s$ (2) $5d$ (3) $4f$ (4) $6p$ 330. $The incorrect statement is:$ (1) $Manganate and permanganate ions are paramagnetic$ (2) $Manganate and permanganate ions are tetrahedral$ (3) $Manganateion is green in colourand permanganate ion in purple in colour$ (4) $In Manganate and permanganate, the π - bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese.$