d- and f-Block Elements PYQs Set 4 (PDF)

Set 4 of 15 · Questions 91-120 of 443

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Mere Teacher · Previous Year Questions JEE Main Chemistry · d- and f-Block Elements · Set 4 (Q91-120)
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91. $Which of the following are the example of double salt? (A) F e S O_{4} .(N H_{4})_{2} S O_{4} . 6 H_{2} O (B) C u S O_{4} . 4 N H_{3} . H_{2} O (C) K_{2} S O_{4} . A 1_{2} (S O_{4})_{3} . 24 H_{2} O (D) Fe (C N)_{2} .4KCN Choose the correct answer.$ (1) $A and C only$ (2) $A and B only$ (3) $A, B and D only$ (4) $B and D only$ 92. $How many moles of acidified K_{2} Cr_{2} O_{7} is required to liberate 6 moles of I_{2} from an aqueous solution of I^{-} ?$ (1) $1$ (2) $0.25$ (3) $0.5$ (4) $2$ 93. $General electronic configuration of lanthanides is:$ (1) $(n-2) f1-14 (n - 1)s2 p6 d0-1 ns2$ (2) $(n-2) f10-14 (n - 1)d0-1 ns2$ (3) $(n-2) f0-14 (n - 1) d10 ns2$ (4) $(n-2) d0-1 (n - 1) f1-14 ns2$ 94. $Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO_{2} and a gaseous product. MnO_{2} reacts with NaCl and concentrated H_{2} SO_{4} to give a pungent gas Z . X, Y, and Z, respectively, are :$ (1) $K_{3} MnO_{4}, K_{2} MnO_{4} and Cl_{2}$ (2) $K_{2} MnO_{4}, KMnO_{4} and SO_{2}$ (3) $KMnO_{4}, K_{2} MnO_{4} and Cl_{2}$ (4) $K_{2} MnO_{4}, KMnO_{4} and Cl_{2}$ 95. $Which of the following statements are correct? (A) The M^{3 +} / M^{2 +} reduction potential for iron is greater than manganese. (B) The higher oxidation states of first row d-block elements get stabilized by oxide ion (C) Aqueous solution of C r^{2 +} can liberate hydrogen from dilute acid (D) Magnetic moment of V^{2 +} is observed between 4.4 - 5.2 BM Choose the correct answer from the options given below:$ (1) $(B), (C) only$ (2) $(A), (B), (D) only$ (3) $(C), (D) only$ (4) $(A), (B) only$ 96. $" X " is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in " X^{’ ’} . The color of the potassium salt of X is$ (1) $purple$ (2) $orange$ (3) $yellow$ (4) $green$ 97. $Alkaline oxidative fusion of MnO_{2} gives "A" which on electrolytic oxidation in alkaline solution produces B . A and B respectively are:$ (1) $Mn_{2} O_{7} and MnO_{4}^{-}$ (2) $MnO_{4}^{2 -} and MnO_{4}^{-}$ (3) $Mn_{2} O_{3} and MnO_{4}^{2 -}$ (4) $MnO_{4}^{2 -} and Mn_{2} O_{7}$ 98. $Assertion (A) : Transition metals and their complexes show catalytic activity.Reason (R) : The activation energy of a reaction is lowered by the catalyst.$ (1) $Both (A) and (R) are correct and (R) is the correct explanation of (A) .$ (2) $Both (A) and (R) are correct but (R) is not the correct explanation of (A).$ (3) $(A) is correct but (R) is incorrect.$ (4) $(A) is incorrect but (R) is correct.$ 99. $In context with the transition elements, which of the following statements is incorrect ?$ (1) $In the highest oxidation states, the transition metal show basic character and form cationic complexes.$ (2) $In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.$ (3) $Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.$ (4) $In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.$ 100. $KMnO_{4} acts as an oxidising agent in alkaline medium. When alkaline KMnO_{4} is treated with KI, iodide ion is oxidised to$ (1) $I_{2}$ (2) $IO^{-}$ (3) $IO_{3}^{-}$ (4) $IO_{4}^{-}$ 101. $Match List-I with List-II List-I Species (A) Cr^{+ 2} (B) Mn^{+} (C) Ni^{+ 2} (D) V^{+} List-II Electronic distribution (I) 3 d^{8} (II) 3 d^{3} 4 s^{1} (III) 3 d^{4} (IV) 3 d^{5} 4 s^{1} Choose the correct answer from the options given below:$ (1) $(A)-I, (B)-II, (C)-III, (D)-IV$ (2) $(A)-III, (B) - IV, (C) - I, (D)-II$ (3) $(A)-IV, (B)-III, (C)-I, (D)-II$ (4) $(A)-II, (B)-I, (C)-IV, (D)-III$ 102. $Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured K_{2} MnO_{4} disproportionates in a neutral or acidic medium to give permanganate. E. With increasing oxidation number of transition metal, ionic character of the oxides decreases. Choose the correct answer from the options given below:$ (1) $B, C, D only$ (2) $A, D, E only$ (3) $A, B, C only$ (4) $B, D, E only$ 103. $Correct order of basic strength of metallic hydroxides$ (1) $Ce (OH)_{3} < Lu (OH)_{3} < Eu (OH)_{3}$ (2) $Ce (OH)_{3} < Eu (OH)_{3} < Lu (OH)_{3}$ (3) $Lu (OH)_{3} < Eu (OH)_{3} < Ce (OH)_{3}$ (4) $Lu (OH)_{3} < Ce (OH)_{3} < Eu (OH)_{3}$ 104. $A ⟶ 4 KOH, O_{2} 2 B (Green) + 2 H_{2} O B ⟶ 4 HCl 2 C (Purple) + MnO_{2} + 2 H_{2} O 2 C ⟶ H_{2} O, KI 2 A + KOH + D In the above sequence of reactions, A and D, respectively, are:$ (1) $KI and KMnO_{4}$ (2) $MnO_{2} and KIO_{3}$ (3) $KIO_{3} and MnO_{2}$ (4) $KI and K_{2} MnO_{4}$ 105. $Which of the following pairs has the same size?$ (1) $F e^{2 +}, N i^{2 +}$ (2) $Z r^{4 +}, T i^{4 +}$ (3) $Z r^{4 +}, H f^{4 +}$ (4) $Z n^{2 +}, H f^{4 +}$ 106. $Which of the following statements is incorrect for pair of elements Zr - Hf ?$ (1) $Both possess same number of valence electrons.$ (2) $Both have identical atomic sizes.$ (3) $Both have almost identical ionic radii.$ (4) $Both of these belong to same period of periodic table.$ 107. $Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified K M n O_{4} for complete oxidation?$ (1) $F e S O_{3}$ (2) $F e C_{2} O_{4}$ (3) $F e (N O_{2})_{2}$ (4) $F e S O_{4}$ 108. $Choose the incorrect statement among the following -$ (1) $The chemistry of different lanthanoids is very similar$ (2) $4 f and 5 f-orbitals are equally shielded$ (3) $d-block element show irregular and erratic chemical properties among themselves$ (4) $La and Lu have partially filled d-orbitals and no other partially filled orbitals$ 109. $Identify the correct statements from the following: I. The ionic radius of Pr^{3 +}, Dy^{3 +} and Sm^{3 +} follow the order, Sm^{3 +} > Pr^{3 +} > Dy^{3 +} . II. Eu^{2 +} acts as strong reducing reagent. III. Pu exhibits +7 oxidation state.$ (1) $I, II only$ (2) $I, III only$ (3) $I, II, III$ (4) $II, III only$ 110. $electronic configuration of Cu (II) is 3 d^{9} whereas that of Cu (I) is 3 d^{10} . Which of the following is correct?$ (1) $Stability of Cu (I) and Cu (II) depends on nature of copper salts$ (2) $Cu (II) is more stable$ (3) $Cu (I) and Cu (II) are equally stable$ (4) $Cu (II) is less stable$ 111. $When M n O_{2} is fused with KOH, a coloured compound is formed. The product and its colour is :$ (1) $K_{2} M n O_{4}, green$ (2) $M n_{2} O_{3}, brown$ (3) $M n_{2} O_{4}, black$ (4) $K M n O_{4}, purple$ 112. $The incorrect statement in respect of chromyl chloride test is$ (1) $formation of lead chromate$ (2) $formation of chromyl chloride$ (3) $liberation of chlorine$ (4) $formation of red vapours.$ 113. $Identify the element having highest ionization enthalpy.$ (1) $Ti$ (2) $Sc$ (3) $Zn$ (4) $Ni$ 114. $Lanthanide contraction is due to increase in$ (1) $shielding by 4 f electrons$ (2) $atomic number$ (3) $effective nuclear charge$ (4) $size of 4 f -orbital.$ 115. $The metal that shows highest and maximum number of oxidation state is :$ (1) $Fe$ (2) $Mn$ (3) $Co$ (4) $Ti$ 116. $Observe the following ions V^{2 +}, Zn^{2 +}, Cu^{2 +}, Fe^{2 +}, Fe^{3 +}, Ti^{3 +}, Sc^{3 +}, Ti^{4 +}, Ni^{3 +}, Co^{3 +}, Cu^{+} How many ions in the above list have zero magnetic moment?$ (1) $4$ (2) $3$ (3) $5$ (4) $2$ 117. $The element with highest standard reduction potential (in volt) (M^{2 +} \to M) among the first row of transition elements is$ (1) $Ti$ (2) $Ni$ (3) $Cr$ (4) $Cu$ 118. $The spin only magnetic moment (μ) value (B.M.) of the compound with strongest oxidising power among Mn_{2} O_{3}, TiO and VO is B.M. (Nearest integer).$ 119. $The 'spin only' magnetic moment value of MO_{4}^{2 -} is ______ BM. (Where M is a metal having least metallic radii. among Sc, Ti, V, Cr, Mn and Zn) .(Given atomic number: Sc = 21, Ti = 22, V = 23, Cr = 24, Mn = 25 and Zn = 30)$ 120. $Number of electrons present in 4f orbital of H o^{3 +} ion is (Given Atomic No. of Ho =67)$