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

Set 7 of 14 · Questions 181-210 of 399

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Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 7 (Q181-210)
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181. $Z r (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of$ (1) $Diagonal relationship$ (2) $Lanthanoid contraction$ (3) $Having similar chemical properties$ (4) $Belonging to same group$ 182. $The most basic hydroxide from the following is$ (1) $Pr (OH)_{3} (Z = 59)$ (2) $Sm (OH)_{3} (Z = 62)$ (3) $Ho (OH)_{3} (Z = 67)$ (4) $La (OH)_{3} (Z = 57)$ 183. $Which one of the following elements constitutes a major impurity in pig iron$ (1) $Sulphur$ (2) $Oxygen$ (3) $Silicon$ (4) $Carbon$ 184. $Among the following the incorrect statement about transition metals is$ (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) $They show variable oxidation states$ 185. $The colour of light absorbed by an aqueous solution of C u S O_{4} is :$ (1) $organge-red$ (2) $blue-green$ (3) $yellow$ (4) $violet$ 186. $Arrange the following elements in the increasing order of number of unpaired electrons in it.(A) Sc (B) Cr (C) V(D) Ti (E) Mn Choose the correct answer from the options given below :$ (1) $(A) < (D) < (C) < (B) < (E)$ (2) $(C) < (E) < (B) < (A) < (D)$ (3) $(A) < (D) < (C) < (E) < (B)$ (4) $(B) < (C) < (D) < (E) < (A)$ 187. $Identify all the correct statements for Lanthanide contraction.(A) The covalent properties of the Lanthanide metal hydroxides increases from La to Lu.(B) The chemical reactivity decreases from La to Lu.(C) La (OH)_{3} is more basic than Lu (OH)_{3} (D) Zr and Hf have about the same radius.(E) Separation of Lanthanides from one another is easy.$ (1) $A, B, C, E only$ (2) $A, B, C, D only$ (3) $A, B, C only$ (4) $B, C, D only$ 188. $The incorrect statement among the following is$ (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) $Actinoid contraction is greater for element to element that Lanthanoid contraction$ 189. $Among the following, the coloured compound is :$ (1) $CuCl$ (2) $K_{3} [Cu (C N)_{4}]$ (3) $C u F_{2}$ (4) $[Cu (C H_{3} C N)_{4}] B F_{4}$ 190. $The element which shows only one oxidation state other than its elemental form is :$ (1) $Cobalt$ (2) $Titanium$ (3) $Nickel$ (4) $Scandium$ 191. $Choose the correct option having all the elements with d^{10} electronic configuration from the following:$ (1) $^{27} Co,^{28} Ni,^{26} Fe,^{24} Cr$ (2) $^{29} Cu,^{30} Zn,^{48} Cd,^{47} Ag$ (3) $^{46} Pd,^{28} Ni,^{26} Fe,_{2}^{24} Cr$ (4) $^{28} Ni,^{24} Cr,^{26} Fe,^{29} Cu$ 192. $Gadolinium has a low value of third ionisation enthalpy because of$ (1) $High basic character$ (2) $Small size$ (3) $High exchange enthalpy$ (4) $Hight electronegativity$ 193. $Identify a 'Chemical twin' among the following:$ (1) $Zr - Ta$ (2) $Nb - Tc$ (3) $Hf-Re$ (4) $Nb - Ta$ 194. $The electronic configuration of transition elements is exhibited by$ (1) $n s^{1}$ (2) $n s^{2} n p^{5}$ (3) $n s_{(}^{2} n - 1_{)} d^{1 - 10}$ (4) $n s_{(}^{2} n - 1_{)} d^{10}$ 195. $Which among the following cations produces colourless aqueous solution in their respective oxidation state?$ (1) $Ti^{3 +}$ (2) $V^{3 +}$ (3) $Sc^{3 +}$ (4) $Cu^{2 +}$ 196. $The lanthanoid that does NOT show +4 oxidation state is$ (1) $Tb$ (2) $Dy$ (3) $Ce$ (4) $Eu$ 197. $The correct order of basicity of oxides of vanadium is$ (1) $V_{2} O_{3} > V_{2} O_{4} > V_{2} O_{5}$ (2) $V_{2} O_{3} > V_{2} O_{5} > V_{2} O_{4}$ (3) $V_{2} O_{5} > V_{2} O_{4} > V_{2} O_{3}$ (4) $V_{2} O_{4} > V_{2} O_{3} > V_{2} O_{5}$ 198. $From the list given below, the number of lanthanides which exhibit +4 state in their oxides is Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy$ (1) $5$ (2) $4$ (3) $6$ (4) $2$ 199. $In the neutral or faintly alkaline medium, KMnO_{4} oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from$ (1) $+6 to +5$ (2) $+7 to +4$ (3) $+6 to +4$ (4) $+7 to +3$ 200. $Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. Fe^{3 +} oxidises the iodide ion B. Fe^{3 +} oxidises the persulphate ion C. Fe^{2 +} reduces the iodide ion D. Fe^{2 +} reduces the persulphate ion Choose the most appropriate answer from the options given below:$ (1) $B only$ (2) $A only$ (3) $B and C only$ (4) $A and D only$ 201. $Give below are two statements: Statement I : The higher oxidation states are more stable down the group among transition elements unlike p block elements. Statement II : Copper can not liberate hydrogen from weak acids. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Both Statement I and Statement II are true$ (2) $Statement I is false but Statement II is true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is true but Statement II is false$ 202. $All Cu (II) halides are known, except iodide, the reason for it is that$ (1) $Cu^{2 +} has much more negative hydration enthalpy$ (2) $Cu^{2 +} ion has smaller size$ (3) $iodide is bulky ion$ (4) $Cu^{2 +} oxidises iodide to iodine.$ 203. $The order of melting points of Cr, Mo and W is$ (1) $Cr > Mo > W$ (2) $Mo > Cr > W$ (3) $W > Mo > Cr$ (4) $W > Cr > Mo$ 204. $Among V, Cr, Zn, Fe, the metal having lowest enthalpy of atomization is$ (1) $V$ (2) $Cr$ (3) $Zn$ (4) $Fe$ 205. $Given below are two statements: Statement I : Potassium permanganate on heating at 573 K forms potassium manganate. Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic innature. choose the most appropriate answer from the options given below:$ (1) $Statement I is true but statement II is false$ (2) $Both statement I and statement II are true$ (3) $Statement I is false but statement II is true$ (4) $Both statement I and statement II are false$ 206. $Pair of transition metal ions having the same number of unpaired electrons is$ (1) $Ti^{3 +}, Mn^{2 +}$ (2) $Ti^{2 +}, Co^{2 +}$ (3) $Fe^{3 +}, Cr^{2 +}$ (4) $V^{2 +}, Co^{2 +}$ 207. $What is the effect of lanthanoid contraction in lanthanoid series of elements with increasing atomic number?$ (1) $Decreases in atomic radii$ (2) $Increases in atomic radii$ (3) $Decreases in melting point$ (4) $Increases in melting point$ 208. $The pair of compounds having metals in their highest oxidation state is :$ (1) $M n O_{2}, F e C l_{3}$ (2) $[M n O_{4}]^{-}, C r O_{2} C l_{2}$ (3) $[Fe(CN)_{6}]^{2-}, [Co(CN)_{6}]^{3-}$ (4) $[N i C l_{4}]^{2-}, [Ni (C O)_{4}].$ 209. $The compound with more covalent character in the following is$ (1) $FeF_{3}$ (2) $VF_{5}$ (3) $VF_{2}$ (4) $TiF_{2}$ 210. $Which of the following is Baeyer's reagent?$ (1) $alkaline KMnO_{4}$ (2) $alkaline Na_{2} Cr_{2} O_{7}$ (3) $acidic K_{2} Cr_{2} O_{7}$ (4) $MnO_{2}$