d- and f-Block Elements PYQs Set 9 (PDF)

Set 9 of 14 · Questions 241-270 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 9 (Q241-270)
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.
241. $German silver contains which of the following metals?$ (1) $Cu, Zn$ (2) $Fe, Zn$ (3) $Zn, Fe, Ni$ (4) $Cu, Zn, Ni$ 242. $The colour and magnetic nature of manganate ion (MnO_{4}^{2 -}) is$ (1) $green, paramagnetic$ (2) $purple, diamagnetic$ (3) $green, diamagnetic$ (4) $purple, paramagnetic.$ 243. $For decolorization of 1 mole of KMnO4, the moles of H2O2 required is :$ (1) $1/2$ (2) $3/2$ (3) $5/2$ (4) $7/2$ 244. $The oxidation state of chromium in the final product formed in the reaction between KI and acidified K_{2} Cr_{2} O_{7} solution is:$ (1) $+6$ (2) $+3$ (3) $+4$ (4) $+2$ 245. $Consider the hydrated ions of T i^{2 +}, V^{2 +}, T i^{3 +} and S c^{3 +} . The correct order of their spin-only magnetic moments is:$ (1) $V^{2 +} < T^{2 +} < T i^{3 +} < S c^{3 +}$ (2) $S c^{3 +} < Ti^{3 +} < T i^{2 +} < V^{2 +}$ (3) $T i^{3 +} < T i^{2 +} < S c^{3 +} < V^{2 +}$ (4) $S c^{3 +} < T i^{3 +} < V^{2 +} < T i^{2 +}$ 246. $Assertion (A): Mo has the ground state electronic configuration 4 d^{5} 5 s^{1} . Reason (R): Mo has the highest exchange energy among the second row transition elements.The correct option among the following is$ (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) $(A) is false but (R) is true$ 247. $A first-row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM . The atomic number of the metal is$ (1) $26$ (2) $25$ (3) $23$ (4) $22$ 248. $The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is$ (1) $Y3+ < Lu3+ < Eu3+ < La3+$ (2) $Lu3+ < Y3+ < Eu3+ < La3+$ (3) $Lu3+ < Eu3+ < La3+ < Y3+$ (4) $La3+ < Eu3+ < Lu3+ < Y3+$ 249. $Formation of coloured solution is possible when metal ion in the compound contain$ (1) $lone pair of electrons$ (2) $unpaired electrons$ (3) $paired electrons$ (4) $none of these.$ 250. $Name the gas that can readily decolourise acidified K M n O_{4} solution.$ (1) $S O_{2}$ (2) $N O_{2}$ (3) $P_{2} O_{5}$ (4) $C O_{2}$ 251. $Consider ' n' is the number of lone pair of electrons present in the equatorial position of the most stable structure of ClF_{3} . The ions from the following with ' n' number of unpaired electrons are A . V^{3 +} B . Ti^{3 +} C . Cu^{2 +} D. Ni^{2 +} E . Ti^{2 +} Choose the correct answer from the options given below:$ (1) $A and C Only$ (2) $A, D and E Only$ (3) $B and D Only$ (4) $B and C Only$ 252. $Magnetic moment 2.83 BM is given by which of the following ions?. (At.nos.Ti = 22, Cr = 24, Mn = 25, Ni = 28)$ (1) $T i^{3 +}$ (2) $N i^{2 +}$ (3) $C r^{3 +}$ (4) $M n^{2 +}$ 253. $Which of the following sets correctly represents the increase in the paramagnetic property of the ions?$ (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) $Mn^{2 +} < Cu^{2 +} < Cr^{2 +} < V^{2 +}$ 254. $The manganate and permanganate ions are tetrahedral, due to$ (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) $The π -bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese$ 255. $The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :$ (1) $Zn (O H)_{2}$ (2) $ZnO$ (3) $[Zn(OH)_{4}]^{2 -}$ (4) $[Z n O_{2}]^{2 -}$ 256. $Potassium permanganate on heating at 513 K gives a product which is :$ (1) $paramagnetic and colourless$ (2) $diamagnetic and green$ (3) $diamagnetic and colourless$ (4) $paramagnetic and green$ 257. $Which one of the lanthanoids given below is the most stable in divalent form?$ (1) $Ce (Atomic Number 58)$ (2) $Sm (Atomic Number 62)$ (3) $Eu (Atomic Number 63)$ (4) $Yb (Atomic Number 70)$ 258. $The electronic configurations of four elements are given below. Which element does not belong to the same family as others?$ (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) $[A r] 3 d^{10} 4 s^{2}$ 259. $Magnetic moment 2.84 B.M. is given by (At. nos. N i = 28, T i = 22, C r = 24, C o = 27)$ (1) $C r^{2 +}$ (2) $C o^{2 +}$ (3) $N i^{2 +}$ (4) $T i^{3 +}$ 260. $The equation which is balanced and represents the correct product(s) is :$ (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) $CuSO4 + 4KCN \to K2[Cu(CN)4] + K2SO4$ 261. $The ‘‘spin-only’’ magnetic moment [in units of Bohr magneton, (μB) of Ni2+ in aqueous solution would be (atomic number of Ni = 28)$ (1) $2.84$ (2) $4.90$ (3) $0$ (4) $1.73$ 262. $The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is$ (1) $C r^{2 +}$ (2) $M n^{2 +}$ (3) $V^{2 +}$ (4) $T i^{2 +}$ 263. $Find the value of spin only magnetic moment for chromium cation in +2 state.$ (1) $3.87 BM$ (2) $4.90 BM$ (3) $2.84 BM$ (4) $1.73 BM$ 264. $The aqueous solution containing which one of the following ions will be colourless ?$ (1) $Fe2+$ (2) $Mn2+$ (3) $Ti3+$ (4) $Sc3+$ 265. $Copper sulphate dissolves in excess of K C N to give$ (1) $C u (C N)_{2}$ (2) $C u C N$ (3) $[C u (C N)_{4}]^{3 -}$ (4) $[C u (C N)_{4}]^{2 -}$ 266. $Identify the alloy containing a non‐metal as a constituent in it.$ (1) $Invar$ (2) $Steel$ (3) $Bell metal$ (4) $Bronze$ 267. $Which of the following 3d-metal ion will give the lowest enthalpy of hydration when dissolved in water ?$ (1) $C r^{2 +}$ (2) $M n^{2 +}$ (3) $F e^{2 +}$ (4) $C o^{2 +}$ 268. $The aqueous solution containing which one of the following ions will be colourless? (Atomic number: S c = 21, F e = 26, T i = 22, M n = 25)$ (1) $S c^{3 +}$ (2) $F e^{2 +}$ (3) $T i^{3 +}$ (4) $M n^{2 +}$ 269. $What will be the value of x in Fe^{x +}, if the magnetic moment, μ = 24 B.M. ?$ (1) $0$ (2) $+1$ (3) $+2$ (4) $+3$ 270. $Which of the following lanthanoid ions is diamagnetic7. (At.nos.Ce = 58, Sm = 62, Eu = 63, Yb = 70)$ (1) $E u^{2 +}$ (2) $Y b^{2 +}$ (3) $C e^{2 +}$ (4) $S m^{2 +}$