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

Set 10 of 15 · Questions 271-300 of 443

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Mere Teacher · Previous Year Questions JEE Main Chemistry · d- and f-Block Elements · Set 10 (Q271-300)
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271. $Assertion (A): Mo has the ground state electronic configuration 4 d^{5} 5 s^{1} . Reason (R): Mo has the highest exchange energy among the second row transition elements.The correct option among the following is$ (1) $(A) is true, (R) is true and (R) is the correct explanation for (A)$ (2) $(A) is true, (R) is true but (R) is not the correct explanation for (A)$ (3) $(A) is true but (R) is false$ (4) $(A) is false but (R) is true$ 272. $A first-row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM . The atomic number of the metal is$ (1) $26$ (2) $25$ (3) $23$ (4) $22$ 273. $The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is$ (1) $Y3+ < Lu3+ < Eu3+ < La3+$ (2) $Lu3+ < Y3+ < Eu3+ < La3+$ (3) $Lu3+ < Eu3+ < La3+ < Y3+$ (4) $La3+ < Eu3+ < Lu3+ < Y3+$ 274. $Formation of coloured solution is possible when metal ion in the compound contain$ (1) $lone pair of electrons$ (2) $unpaired electrons$ (3) $paired electrons$ (4) $none of these.$ 275. $Name the gas that can readily decolourise acidified K M n O_{4} solution.$ (1) $S O_{2}$ (2) $N O_{2}$ (3) $P_{2} O_{5}$ (4) $C O_{2}$ 276. $Consider ' n' is the number of lone pair of electrons present in the equatorial position of the most stable structure of ClF_{3} . The ions from the following with ' n' number of unpaired electrons are A . V^{3 +} B . Ti^{3 +} C . Cu^{2 +} D. Ni^{2 +} E . Ti^{2 +} Choose the correct answer from the options given below:$ (1) $A and C Only$ (2) $A, D and E Only$ (3) $B and D Only$ (4) $B and C Only$ 277. $Magnetic moment 2.83 BM is given by which of the following ions?. (At.nos.Ti = 22, Cr = 24, Mn = 25, Ni = 28)$ (1) $T i^{3 +}$ (2) $N i^{2 +}$ (3) $C r^{3 +}$ (4) $M n^{2 +}$ 278. $Which of the following sets correctly represents the increase in the paramagnetic property of the ions?$ (1) $Cu^{2 +} < V^{2 +} < Cr^{2 +} < Mn^{2 +}$ (2) $Cu^{2 +} < Cr^{2 +} < V^{2 +} < Mn^{2 +}$ (3) $Mn^{2 +} < V^{2 +} < Cr^{2 +} < Cu^{2 +}$ (4) $Mn^{2 +} < Cu^{2 +} < Cr^{2 +} < V^{2 +}$ 279. $The manganate and permanganate ions are tetrahedral, due to$ (1) $The π -bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese$ (2) $There is no π -bonding$ (3) $The π -bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese$ (4) $The π -bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese$ 280. $The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :$ (1) $Zn (O H)_{2}$ (2) $ZnO$ (3) $[Zn(OH)_{4}]^{2 -}$ (4) $[Z n O_{2}]^{2 -}$ 281. $Potassium permanganate on heating at 513 K gives a product which is :$ (1) $paramagnetic and colourless$ (2) $diamagnetic and green$ (3) $diamagnetic and colourless$ (4) $paramagnetic and green$ 282. $Which one of the lanthanoids given below is the most stable in divalent form?$ (1) $Ce (Atomic Number 58)$ (2) $Sm (Atomic Number 62)$ (3) $Eu (Atomic Number 63)$ (4) $Yb (Atomic Number 70)$ 283. $The electronic configurations of four elements are given below. Which element does not belong to the same family as others?$ (1) $[X e] 4 f^{4} 5 d^{10} 6 s^{2}$ (2) $[K r] 4 d^{10} 5 s^{2}$ (3) $[N e] 3 s^{2} 3 p^{5}$ (4) $[A r] 3 d^{10} 4 s^{2}$ 284. $Magnetic moment 2.84 B.M. is given by (At. nos. N i = 28, T i = 22, C r = 24, C o = 27)$ (1) $C r^{2 +}$ (2) $C o^{2 +}$ (3) $N i^{2 +}$ (4) $T i^{3 +}$ 285. $The equation which is balanced and represents the correct product(s) is :$ (1) $Li2O + 2KCl \to 2LiCl + K2O$ (2) $[CoCl(NH3)5]+ + 5H+ \to Co2+ + 5NH4+ + Cl-$ (3) $[Mg(H_{2} O)_{6}]^{2 +} + (EDTA)^{4-} [Mg(EDTA)]^{2 +} + 6 H_{2} O$ (4) $CuSO4 + 4KCN \to K2[Cu(CN)4] + K2SO4$ 286. $The ‘‘spin-only’’ magnetic moment [in units of Bohr magneton, (μB) of Ni2+ in aqueous solution would be (atomic number of Ni = 28)$ (1) $2.84$ (2) $4.90$ (3) $0$ (4) $1.73$ 287. $The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is$ (1) $C r^{2 +}$ (2) $M n^{2 +}$ (3) $V^{2 +}$ (4) $T i^{2 +}$ 288. $Find the value of spin only magnetic moment for chromium cation in +2 state.$ (1) $3.87 BM$ (2) $4.90 BM$ (3) $2.84 BM$ (4) $1.73 BM$ 289. $The aqueous solution containing which one of the following ions will be colourless ?$ (1) $Fe2+$ (2) $Mn2+$ (3) $Ti3+$ (4) $Sc3+$ 290. $Copper sulphate dissolves in excess of K C N to give$ (1) $C u (C N)_{2}$ (2) $C u C N$ (3) $[C u (C N)_{4}]^{3 -}$ (4) $[C u (C N)_{4}]^{2 -}$ 291. $Identify the alloy containing a non‐metal as a constituent in it.$ (1) $Invar$ (2) $Steel$ (3) $Bell metal$ (4) $Bronze$ 292. $Which of the following 3d-metal ion will give the lowest enthalpy of hydration when dissolved in water ?$ (1) $C r^{2 +}$ (2) $M n^{2 +}$ (3) $F e^{2 +}$ (4) $C o^{2 +}$ 293. $The aqueous solution containing which one of the following ions will be colourless? (Atomic number: S c = 21, F e = 26, T i = 22, M n = 25)$ (1) $S c^{3 +}$ (2) $F e^{2 +}$ (3) $T i^{3 +}$ (4) $M n^{2 +}$ 294. $What will be the value of x in Fe^{x +}, if the magnetic moment, μ = 24 B.M. ?$ (1) $0$ (2) $+1$ (3) $+2$ (4) $+3$ 295. $Which of the following lanthanoid ions is diamagnetic7. (At.nos.Ce = 58, Sm = 62, Eu = 63, Yb = 70)$ (1) $E u^{2 +}$ (2) $Y b^{2 +}$ (3) $C e^{2 +}$ (4) $S m^{2 +}$ 296. $Among, Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is BM (in nearest integer).$ 297. $The number of f electrons in the ground state electronic configuration of Np(Z = 93) is ____. (Nearest integer)$ 298. $Consider the following reactions A + NaCl Little amount + H_{2} SO_{4} \to CrO_{2} Cl_{2} + Side Products CrO_{2} Cl_{2 (Vapour)} + NaOH \to B + NaCl + H_{2} O B + H^{+} \to C + H_{2} O The number of terminal ' O' present in the compound 'C' is .$ 299. $The number of terminal oxygen atoms present in the product B obtained from the following reaction is F e C r_{2} O_{4} + N a_{2} C 0_{3} + O_{2} \to A + F e_{2} O_{3} + C O_{2} A + H^{+} \to B+ H_{2} O + N a^{+}$ 300. $Among C o^{3 +}, T i^{2 +}, V^{2 +} and C r^{2 +} ions, one if used as a reagent cannot liberate H_{2} from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is......B.M. (Nearest integer)$