d- and f-Block Elements PYQs Set 6 (PDF)

Set 6 of 14 · Questions 151-180 of 399

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Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 6 (Q151-180)
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151. $Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being.$ (1) $lesser energy difference between 5f and 6d than between 4f and 5d orbitals$ (2) $more energy difference between 5f and 6d than between 4f and 5d orbitals$ (3) $more reactive nature of the actinoids than the lanthanoids$ (4) $4f orbitals more diffused than the 5f orbitals$ 152. $Which of the following does not represent property stated against it?$ (1) $Co^{2 +} < Fe^{2 +} < Mn^{2 +} - Ionic size$ (2) $Ti < V < Mn - Number of oxidation states$ (3) $Cr^{2 +} < Mn^{24} < Fe^{24} - paramagnetic behaviour$ (4) $none of the above$ 153. $The spin only magnetic moment of Fe^{2 x} ion (in B.M.) is approximately$ (1) $4$ (2) $7$ (3) $5$ (4) $6$ 154. $What is the stock notation of Manganese dioxide?$ (1) $Mn (I) O_{2}$ (2) $Mn (II) O_{2}$ (3) $Mn (III) O_{2}$ (4) $Mn (IV) O_{2}$ 155. $Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce 58, Eu = 63, Tb = 65, Lu = 71)$ (1) $Eu^{2 +}$ (2) $Tb^{4 +}$ (3) $Lu^{3 +}$ (4) $Ce^{3 +}$ 156. $Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Size of Bk^{3 +} ion is less than Np^{3 +} ion. Reason R : The above is a consequence of the lanthanoidcontraction. choose the correct answer from the options given below:$ (1) $A is false but R is true$ (2) $Both A and R are true but R is not the correct explanation of A$ (3) $Both A and R are true and R is the correct explanation of A$ (4) $A is true but R is false$ 157. $Amongst T i F_{6}^{2 -}, C o F_{6}^{3 -}, C u_{2} C l_{2} and N i C l_{4}^{2 -}, which are the colourless species? (Atomic number of T i = 22, C o = 27, C u = 29, N i = 28)$ (1) $C o F_{6}^{3 -} and N i C l_{4}^{2 -}$ (2) $T i F_{6}^{2 -} and C u_{2} C l_{2}$ (3) $C u_{2} C l_{2} and N i C l_{4}^{2 -}$ (4) $T i F_{6}^{2 -} and C o F_{6}^{3 -}$ 158. $The correct set of ions (aqueous solution) with same colour from the following is:$ (1) $Sc^{3 +}, Ti^{3 +}, Cr^{2 +}$ (2) $V^{2 +}, Cr^{3 +}, Mn^{3 +}$ (3) $Ti^{4 +}, V^{4 +}, Mn^{2 +}$ (4) $Zn^{2 +}, V^{3 +}, Fe^{3 +}$ 159. $Which of the following is the common oxidation state for 'transition' elements?$ (1) $+3$ (2) $+1$ (3) $+2$ (4) $+4$ 160. $Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?$ (1) $C u C l_{2}$ (2) $AgCl$ (3) $ZnCl$ (4) $C u_{2} C l_{2}$ 161. $The incorrect statement(s) among (a) - (c) is (are) A. W(VI) is more stable than Cr (VI) B. In presence f HCl, permanganate titrations provide satisfactory results. C. Some lanthanoid oxides can be used as phosphors.$ (1) $(A) and (B) only$ (2) $(A) only$ (3) $(B) and (C) only$ (4) $(B) only$ 162. $Match List - I with List - II. List -I (A) Bronze (B) Brass (C) UK silvercoin (D) Stainlesssteel List -II (I) Cu, Ni (II) Fe, Cr, Ni, C (III) Cu, Zn (IV) Cu, Sn Choose the correct answer from the options given below:$ (1) $(A)-(IV), (B)- (II), (C)- (III), (D)- (I)$ (2) $(A)-(IV), (B)- (III), (C)- (I), (D)- (II)$ (3) $(A)- (III), (B)-(IV), (C)- (II), (D)- (I)$ (4) $(A)- (III), (B)- (I), (C)-(IV), (D)- (II)$ 163. $Which one of the following has a magnetic monent of 1.75 B.M?$ (1) $Ti^{3 +}$ (2) $V^{3 +}$ (3) $Cr^{3 +}$ (4) $Fe^{3 +}$ 164. $While preparing crystals of Mohr's salt, dil H_{2} SO_{4} is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H_{2} SO_{4} is added here to :$ (1) $prevent the hydrolysis of ferrous sulphate$ (2) $prevent the hydrolysis of ammonium sulphate$ (3) $make the medium strongly acidic$ (4) $increase the rate of formation of crystals$ 165. $When neutral or faintly alkaline K M n O_{4} is treated with potassium iodide, iodide ion is converted into‘ X ’ . ‘X’ is$ (1) $I_{2}$ (2) $I O_{4}^{-}$ (3) $I O_{3}^{-}$ (4) $I O^{-}$ 166. $Which of the following is an amphoteric oxide?$ (1) $V_{2} O_{5}, Cr_{2} O_{3}$ (2) $CrO, V_{2} O_{5}$ (3) $Mn_{2} O_{7}, Cr_{2} O_{3}$ (4) $V_{2} O_{5}, V_{2} O_{4}$ 167. $Which one of the following does not correctly represent the correct order of the property indicated against it?$ (1) $Ti < V < Cr < Mn : increasing number of oxidation states$ (2) $T i^{3 +} < V^{3 +} < C r^{3 +} < M n^{3 +} : increasing magnetic moment$ (3) $Ti < V < Cr < Mn : increasing melting points$ (4) $Ti < V < Mn < Cr : increasing 2nd ionization enthalpy$ 168. $When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral F e C l_{3}, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains$ (1) $S O_{3}^{2 -} & C H_{3} C O O^{-}$ (2) $C H_{3} C O O^{-} & N O_{3}^{-}$ (3) $S O_{3}^{2 -} & C_{2} O_{4}^{2 -}$ (4) $C_{2} O_{4}^{2 -} & N O_{3}^{-}$ 169. $The bivalent metal ion having maximum paramagnetic behaviour among the first transition series elements is$ (1) $Mn^{2 +}$ (2) $Cu^{2 +}$ (3) $Sc^{2 +}$ (4) $Cu^{+}$ 170. $Cu_{2} Cl_{2} and CuCl_{2} in aqueous medium$ (1) $stability of Cu_{2} Cl_{2} is equal to stability of CuCl_{2}$ (2) $both are unstable$ (3) $Cu_{2} Cl_{2} is more stable than CuCl_{2}$ (4) $CuCl_{2} is more stable than Cu_{2} Cl_{2},$ 171. $Which one of the following statements concerning lanthanides is false?$ (1) $Most characteristic oxidation state of lanthanides is +3 .$ (2) $The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.$ (3) $All lanthanides are dense metals.$ (4) $Lanthanides are separated from one another by ion exchange methods.$ 172. $The correct statement about Cr^{2 +} and Mn^{3 +} among the following is (Given, atomic number of Cr = 24 and Mn = 25)$ (1) $Cr^{2 +} is a reducing agent.$ (2) $Mn^{3 +} is a reducing agent.$ (3) $Both Cr^{2 +} and Mn^{3 +} exhibit d^{5} outer electronic configuration.$ (4) $When Cr^{2 +} is used as reducing agent, it attains d^{5} configuration.$ 173. $The orange colour of K_{2} Cr_{2} O_{7} and purple colour of KMnO_{4} is due to$ (1) $Charge transfer transition in both.$ (2) $d\tod transition in KMnO_{4} and charge transfer transitions in K_{2} Cr_{2} O_{7} .$ (3) $d\tod transition in K_{2} Cr_{2} O_{7} and charge transfer transitions in KMnO_{4} .$ (4) $d \to d transition in both.$ 174. $The common positive oxidation states for an element with atomic number 24, are :$ (1) $+ 2 to +6$ (2) $+ 1 and + 3 to + 6$ (3) $+ 1 and + 3$ (4) $+ 1 and + 6$ 175. $Identify the element that forms amphoteric oxide.$ (1) $Carbon$ (2) $Zinc$ (3) $Calcium$ (4) $Sulphur$ 176. $When C u^{2 +} ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y respectively are$ (1) $X = C u_{2} I_{2} Y= N a_{2} S_{4} O_{5}$ (2) $X= C u_{2} I_{2} Y= N a_{2} S_{4} O_{6}$ (3) $X= C u I_{2} Y= N a_{2} S_{4} O_{3}$ (4) $X= C u I_{2} Y= N a_{2} S_{4} O_{6}$ 177. $Given below are two statementsAssertion (A): All Cu (II) halides are known except the iodideReason (R): Cu^{2 +} oxidizes I^{-} to I_{2} The correct answer is$ (1) $Both (A) and (R) are correct and (R) is the correct explanation of (A)$ (2) $Both (A) and (R) are correct and (R) is the correct but (R) is not the correct explanation of (A)$ (3) $(A) is correct but (R) is not correct$ (4) $(A) is not correct but (R) is correct$ 178. $The main products formed when copper metal is reacted with concentrated HNO_{3} are$ (1) $Cu (NO_{3})_{2} : NO$ (2) $Cu (NO_{3})_{2} : H_{2}$ (3) $Cu (NO_{3})_{2} : NO_{2}$ (4) $Cu (NO_{3}) : NO$ 179. $Identify the correctly matched pairs i. Ti O_{2} - pigment industry ii. Mn O_{2} - dry battery cells iii. Cu/Ni alloy - UK 'copper' coins$ (1) $i, ii, iii$ (2) $ii, iii only$ (3) $i, ii only$ (4) $i, iii only$ 180. $The calculated spin only magnetic moment of Cr^{2 +} ion is$ (1) $4.90 BM$ (2) $5.92 BM$ (3) $2.84 BM$ (4) $3.87 BM$