Coordination Compounds PYQs Set 3 (PDF)

Set 3 of 18 · Questions 61-90 of 522

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Mere Teacher · Previous Year Questions NEET Chemistry · Coordination Compounds · Set 3 (Q61-90)
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61. $Which complex among the following has the highest value of spin only magnetic moment? (Fe (CN)_{6})^{3 -}, (Fe (CN)_{6})^{4 -}, (Ni (CN)_{4})^{2 -}, (NiCl_{4})^{2 -}$ (1) $(Fe (CN)_{6})^{3 -}$ (2) $(Fe (CN)_{6})^{4 -}$ (3) $(Ni (CN)_{4})^{2 -}$ (4) $(NiCl_{4})^{2 -}$ 62. $Consider the following complex ions, P, Q and R. P = [F e F_{6}]^{3-}, Q = [V(H_{2} O)_{6}]^{2 +} and R = [Fe(H_{2} O)_{6}]^{2 +} . The correct order of the complex ions, according to their spin-only magnetic moment values (in B.M.) is$ (1) $R < Q < P$ (2) $Q < R < P$ (3) $R < P < Q$ (4) $Q < P < R$ 63. $Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?.$ (1) $[N i (N H_{3})_{6}]^{2 +}$ (2) $[Z n (N H_{3})_{6}]^{2 +}$ (3) $[C r (N H_{3})_{6}]^{3 +}$ (4) $[C o (N H_{3})_{6}]^{3 +}$ 64. $The coordination number of The in K_{4} (Th (C_{2} O_{4})_{4} (H_{2} O)_{2}) is: (C_{2} O_{4}^{2 -} = oxalato)$ (1) $14$ (2) $6$ (3) $8$ (4) $10$ 65. $Which one of the following statement is correct for d^{4} ions [P = pairing energy]$ (1) $When Δ_{0} > P, low-spin complex form$ (2) $When Δ_{0} < P, low-spin complex form$ (3) $When Δ_{0} > P, high-spin complex form$ (4) $When Δ_{0} < P, both high-spin and low-spin complexes form$ 66. $The following complexes (CoCl (NH_{3})_{5})^{2 +}, (Co (CN)_{6})^{3 -}, (Co (NH_{3})_{5} (H_{2} O))^{3 +}, (Cu (H_{2} O)_{4})^{2 +} (A) (B) (C) (D) The correct order of A, B, C and D in terms of wavenumber of light absorbed is :$ (1) $C < D < A < B$ (2) $B < C < A < D$ (3) $A < C < B < D$ (4) $D < A < C < B$ 67. $Match List I with List II List I (Complex) A. Ni(CO)_{4} B. [Ni(CN)_{4}]^{2 -} C. [Co(CN)_{6}]^{3 -} D [C o F_{6}]^{3 -} List II (Hybndization) I. s p^{3} II s p^{3} d^{2} III. d^{2} s p^{3} IV. d s p^{2} Choose the correct answer from the options given below:$ (1) $A-IV,B-I,C-III,D-II$ (2) $A-I B-IV,C-III,D-II$ (3) $A-LB-IV,C-II,D-III$ (4) $A-IV, B-I, C-II. D-III$ 68. $Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum structural distortion ? (en-ethylenediamine; H_{2} N- C H_{2} - C H_{2} - N H_{2})$ (1) $[Cu (H_{2} 0)_{6}] S O_{4}$ (2) $[Cu(en) (H_{2} O)_{4}] S O_{4}$ (3) $cis-[Cu(en)_{2} C l_{2}]$ (4) $trans-[Cu(en)_{2} C l_{2}]$ 69. $Number of complex(es) which will exist in cis-trans is/are$ (1) $C o C l_{3} . 4 N H_{3}$ (2) $C o C l_{3} . 5 N H_{3}$ (3) $C o C l_{3} . 6 N H_{3} and$ (4) $CoCl (N O_{3})_{2} . 5 N H_{3}$ 70. $Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C ?$ (1) $CoCl3\cdot4NH3$ (2) $CoCl3\cdot5NH3$ (3) $CoCl3\cdot6NH3$ (4) $CoCl3\cdot3NH3$ 71. $The d- electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is:$ (1) $t_{2}_{g}^{3} e_{g}^{0}$ (2) $t_{2}_{g}^{6} e_{g}^{1}$ (3) $t_{2 g}^{5} e_{g}^{2}$ (4) $e^{4} t_{2}^{3}$ 72. $Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A : In the complex Ni (C O)_{4} and Fe (C O)_{5}, the metals have zero oxidation state. Reason R: Low oxidation states are found when a complex has ligands capable of π -donor character in addition to the σ -bonding. choose the most appropriate answer from the options given below$ (1) $A is correct but R is not correct$ (2) $A is not correct but R is correct$ (3) $Both A and R are correct but R is NOT the correct explanation of A$ (4) $Both A and R are correct and R is the correct explanation of A$ 73. $Identify the correct set of (Co (NH_{3})_{6})^{3 +} ion. (hybridisation of Co^{3 +}, type of complex, number of unpaired electrons in the complex ion respectively)$ (1) $d^{2} sp^{3}, inner orbital complex, zero$ (2) $sp^{3} d^{2}, outer orbital complex, three$ (3) $d^{2} sp^{3}, inner orbital complex, two$ (4) $sp^{3} d^{2}, outer orbital complex, zero$ 74. $The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is : (A) Ni (C O)_{4} (B) [Ni (H_{2} O)_{6}] C l_{2} (C) N a_{2} [Ni (C N)_{4}] (D) P d C l_{2} (P P h_{3})_{2}$ (1) $(A) \approx (C) < (B) \approx (D)$ (2) $(A) \approx (C) \approx (D) < (B)$ (3) $(C) \approx (D) < (B) < (A)$ (4) $(C) < (D) < (B) < (A)$ 75. $Which of the following complexes will exhibit maximum attraction to an applied magnetic field?$ (1) $[N i (H_{2} O)_{6}]^{2 +}$ (2) $[Co(en)_{3}]^{3 +}$ (3) $[Zn(H_{2} O)_{6}]^{2 +}$ (4) $[Co(H_{2} O)_{6}]^{2 +}$ 76. $The correct statements among I to III are: (I) Valence bond theory cannot explain the color exhibited by transition metal complexes. (II) Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes. (III) Valence bond theory cannot distinguish ligands as week and strong field ones.$ (1) $(II) and (III) only$ (2) $(I), (II) and (III)$ (3) $(I) and (III) only$ (4) $(I) and (II) only$ 77. $Which sets of the d -orbitals are directly oriented towards the ligands in octahedral coordination compounds?$ (1) $d_{x^{2} - y^{2}} and d_{xy}$ (2) $d_{z^{2}} and d_{yz}$ (3) $d_{xz} and d_{xy}$ (4) $d_{x^{2} - y^{2}} and d_{z^{2}}$ 78. $If the crystal field splitting energy of a tetrahedral complex (Δ_{t}) of the type (M L_{4})^{n +} is x eV, what is the crystal field splitting energy with respect to an octahedral complex, (M L_{6})^{n +} ?$ (1) $\frac{9 x}{4} eV$ (2) $\frac{9 x}{8} eV$ (3) $\frac{4 x}{9} eV$ (4) $\frac{4 x}{5} eV$ 79. $Match the following List-I (Complex) (A) [Co F_{6}]^{3 -} (B) [Co (C_{2} O_{4})_{3}]^{3 -} (C) [Fe F_{6}]^{3 -} (D) [Mn (CN)_{6}]^{3 -} List-II (Spin only Magnetic moment) (I) 0 (II) 24 (III) 8 (IV) 35 (V) 15 The correct answer is:$ (1) $A-V, B-II, C-IV, D-I$ (2) $A-II, B-I, C-IV, D-III$ (3) $A-II, B-I, C-V, D-III$ (4) $A-III, B-II, C-I, D-V$ 80. $The correct order of the number of unpaired electrons in the given complexes is (A)[Fe(CN)_{6}]^{3 -} (B) [F e F_{6}]^{3 -} (C) [C o F_{6}]^{3 -} (D) [Cr( oxalate )_{3}]^{3 -} (E) [Ni(CO)_{4}] Choose the correct answer from the options given below:$ (1) $E<A<D<C<B$ (2) $E<A<B<D<C$ (3) $A < E, C < B < D$ (4) $A<E<D<C<B$ 81. $In Fe (C O)_{5}, the Fe - C bond possesses :$ (1) $π-character only$ (2) $both σ and π characters$ (3) $ionic character only$ (4) $σ-character only$ 82. $Which formula and name combination is incorrect?$ (1) $K_{3} (Al (C_{2} O_{4})_{3}) - Potassium trioxalatoaluminate (II)$ (2) $(Pt (NH_{3})_{2} Cl (NO_{2})) - Diamminechloridonitrito-N-platinum(II)$ (3) $(CoCl_{2} (en)_{2}) Cl - Dichloridodiethylenediammine cobalt(II) chloride$ (4) $(Co (NH_{3})_{4} (H_{2} O) Cl) Cl_{2} - Tetraammineaquachloridocobalt(III)chloride$ 83. $The set which does not have ambidentate ligand(s) is$ (1) $C_{2} O_{4}^{2 -}, ethylene diammme, H_{2} O$ (2) $E D T A^{4 -}, N C S^{-}, C_{2} O_{4}^{2 -}$ (3) $N O_{2}^{-}, C_{2} O_{4}^{2 -}, E D T A^{4 -}$ (4) $C_{2} O_{4}^{2 -}, N O_{2}^{-}, N C S^{-}$ 84. $' X ' is the number of acidic oxides among VO_{2}, V_{2} O_{3}, CrO_{3}, V_{2} O_{5} and Mn_{2} O_{7} . The primary valency of cobalt in (Co (H_{2} NCH_{2} CH_{2} NH_{2})_{3})_{2} (SO_{4})_{3} is Y. The value of X + Y is .$ (1) $3$ (2) $4$ (3) $2$ (4) $5$ 85. $Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :$ (1) $Tetraanionic complex with coordination number six$ (2) $Neutral complex with coordination number four$ (3) $Dianionic complex with coordination number six$ (4) $Dianionic complex with coordination number four$ 86. $Mixture X = 0.02 mole of [Co(N H_{3})_{5} S O_{4}]Br and 0.02 mole of [Co (N H_{3})_{5} Br] S O_{4} was prepared in 2L of solution 1 L of mixture X + excess A g N O_{3} —\to Y 1 L of mixture X + excess B a C l_{2} —\to Z Number of moles Y and Z are$ (1) $0.03, 0.02$ (2) $0.01, 0.01$ (3) $0.02, 0.01$ (4) $0.02, 0.02$ 87. $Which of the following complex is octahedral, diamagnetic and the most stable?$ (1) $N a_{3} [C o C l_{6}]$ (2) $[Ni (N H_{3})_{6}] C l_{2}$ (3) $K_{3} [Co (C N)_{6}]$ (4) $[Co (H_{2} O)_{6}] C l_{2}$ 88. $Which one of the following has the highest molar conductivity?$ (1) $Diammine dichloroplatinum (II)$ (2) $Tetraamminedichlorocobalt (III) chloride$ (3) $Potassium hexacyano ferrate (II)$ (4) $Hexa aquo chromium (III) chloride$ 89. $The IUPAC name for ((CO)_{5} Mn - Mn (CO)_{5}) is$ (1) $bis(pentacarbonylmanganate)(VII)$ (2) $bis(pentacarbonyl dimanganese)$ (3) $bis(pentacarbonyl manganese)$ (4) $decacarbonyldimanganate(VII).$ 90. $Which one of the following is tris (ethane-1,2-diammine) cobalt (III) sulphate?$ (1) $(Co (en)_{2})_{2} (SO_{4})_{3}$ (2) $(Co (en)_{2} SO_{4})$ (3) $(Co (en)_{3}) SO_{4}$ (4) $(Co (en)_{3})_{2} (SO_{4})_{3}$