d- and f-Block Elements PYQs Set 7 (PDF)

Set 7 of 15 · Questions 181-210 of 443

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Mere Teacher · Previous Year Questions JEE Main Chemistry · d- and f-Block Elements · Set 7 (Q181-210)
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181. $Match List - I with List - II. List -I (A) Bronze (B) Brass (C) UK silvercoin (D) Stainlesssteel List -II (I) Cu, Ni (II) Fe, Cr, Ni, C (III) Cu, Zn (IV) Cu, Sn Choose the correct answer from the options given below:$ (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) $(A)- (III), (B)- (I), (C)-(IV), (D)- (II)$ 182. $Which one of the following has a magnetic monent of 1.75 B.M?$ (1) $Ti^{3 +}$ (2) $V^{3 +}$ (3) $Cr^{3 +}$ (4) $Fe^{3 +}$ 183. $While preparing crystals of Mohr's salt, dil H_{2} SO_{4} is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H_{2} SO_{4} is added here to :$ (1) $prevent the hydrolysis of ferrous sulphate$ (2) $prevent the hydrolysis of ammonium sulphate$ (3) $make the medium strongly acidic$ (4) $increase the rate of formation of crystals$ 184. $When neutral or faintly alkaline K M n O_{4} is treated with potassium iodide, iodide ion is converted into‘ X ’ . ‘X’ is$ (1) $I_{2}$ (2) $I O_{4}^{-}$ (3) $I O_{3}^{-}$ (4) $I O^{-}$ 185. $Which of the following is an amphoteric oxide?$ (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) $V_{2} O_{5}, V_{2} O_{4}$ 186. $Which one of the following does not correctly represent the correct order of the property indicated against it?$ (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) $Ti < V < Mn < Cr : increasing 2nd ionization enthalpy$ 187. $When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral F e C l_{3}, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains$ (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) $C_{2} O_{4}^{2 -} & N O_{3}^{-}$ 188. $The bivalent metal ion having maximum paramagnetic behaviour among the first transition series elements is$ (1) $Mn^{2 +}$ (2) $Cu^{2 +}$ (3) $Sc^{2 +}$ (4) $Cu^{+}$ 189. $Cu_{2} Cl_{2} and CuCl_{2} in aqueous medium$ (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) $CuCl_{2} is more stable than Cu_{2} Cl_{2},$ 190. $Which one of the following statements concerning lanthanides is false?$ (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) $Lanthanides are separated from one another by ion exchange methods.$ 191. $The correct statement about Cr^{2 +} and Mn^{3 +} among the following is (Given, atomic number of Cr = 24 and Mn = 25)$ (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) $When Cr^{2 +} is used as reducing agent, it attains d^{5} configuration.$ 192. $The orange colour of K_{2} Cr_{2} O_{7} and purple colour of KMnO_{4} is due to$ (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) $d \to d transition in both.$ 193. $The common positive oxidation states for an element with atomic number 24, are :$ (1) $+ 2 to +6$ (2) $+ 1 and + 3 to + 6$ (3) $+ 1 and + 3$ (4) $+ 1 and + 6$ 194. $Identify the element that forms amphoteric oxide.$ (1) $Carbon$ (2) $Zinc$ (3) $Calcium$ (4) $Sulphur$ 195. $When C u^{2 +} ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y respectively are$ (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) $X= C u I_{2} Y= N a_{2} S_{4} O_{6}$ 196. $Given below are two statementsAssertion (A): All Cu (II) halides are known except the iodideReason (R): Cu^{2 +} oxidizes I^{-} to I_{2} The correct answer is$ (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) $(A) is not correct but (R) is correct$ 197. $The main products formed when copper metal is reacted with concentrated HNO_{3} are$ (1) $Cu (NO_{3})_{2} : NO$ (2) $Cu (NO_{3})_{2} : H_{2}$ (3) $Cu (NO_{3})_{2} : NO_{2}$ (4) $Cu (NO_{3}) : NO$ 198. $Identify the correctly matched pairs i. Ti O_{2} - pigment industry ii. Mn O_{2} - dry battery cells iii. Cu/Ni alloy - UK 'copper' coins$ (1) $i, ii, iii$ (2) $ii, iii only$ (3) $i, ii only$ (4) $i, iii only$ 199. $The calculated spin only magnetic moment of Cr^{2 +} ion is$ (1) $4.90 BM$ (2) $5.92 BM$ (3) $2.84 BM$ (4) $3.87 BM$ 200. $Z r (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of$ (1) $Diagonal relationship$ (2) $Lanthanoid contraction$ (3) $Having similar chemical properties$ (4) $Belonging to same group$ 201. $The most basic hydroxide from the following is$ (1) $Pr (OH)_{3} (Z = 59)$ (2) $Sm (OH)_{3} (Z = 62)$ (3) $Ho (OH)_{3} (Z = 67)$ (4) $La (OH)_{3} (Z = 57)$ 202. $Which one of the following elements constitutes a major impurity in pig iron$ (1) $Sulphur$ (2) $Oxygen$ (3) $Silicon$ (4) $Carbon$ 203. $Among the following the incorrect statement about transition metals is$ (1) $Cr, Mo and W have high melting points$ (2) $With increase in number of unpaired electrons melting point increases$ (3) $Mn^{3 +} is more stable than Mn^{2 +}$ (4) $They show variable oxidation states$ 204. $The colour of light absorbed by an aqueous solution of C u S O_{4} is :$ (1) $organge-red$ (2) $blue-green$ (3) $yellow$ (4) $violet$ 205. $Arrange the following elements in the increasing order of number of unpaired electrons in it.(A) Sc (B) Cr (C) V(D) Ti (E) Mn Choose the correct answer from the options given below :$ (1) $(A) < (D) < (C) < (B) < (E)$ (2) $(C) < (E) < (B) < (A) < (D)$ (3) $(A) < (D) < (C) < (E) < (B)$ (4) $(B) < (C) < (D) < (E) < (A)$ 206. $Identify all the correct statements for Lanthanide contraction.(A) The covalent properties of the Lanthanide metal hydroxides increases from La to Lu.(B) The chemical reactivity decreases from La to Lu.(C) La (OH)_{3} is more basic than Lu (OH)_{3} (D) Zr and Hf have about the same radius.(E) Separation of Lanthanides from one another is easy.$ (1) $A, B, C, E only$ (2) $A, B, C, D only$ (3) $A, B, C only$ (4) $B, C, D only$ 207. $The incorrect statement among the following is$ (1) $Most of the trivalent Lanthanoid ions are colorless in the solid state$ (2) $Lanthanoids are good conductors of heat and electricity$ (3) $Actinoids are highly reactive metals, especially when finely divided$ (4) $Actinoid contraction is greater for element to element that Lanthanoid contraction$ 208. $Among the following, the coloured compound is :$ (1) $CuCl$ (2) $K_{3} [Cu (C N)_{4}]$ (3) $C u F_{2}$ (4) $[Cu (C H_{3} C N)_{4}] B F_{4}$ 209. $The molar mass of the water insoluble product formed from the fusion of chromite ore (FeCr_{2} O_{4}) with Na_{2} CO_{3} in presence of O_{2} is gmol^{- 1} .$ 210. $Niobium (Nb) and ruthenium (Ru) have " x " and " y " number of electrons in their respective 4 d orbitals. The value of x + y is -.$