Coordination Compounds PYQs Set 9 (PDF)

Set 9 of 18 · Questions 241-270 of 522

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Mere Teacher · Previous Year Questions NEET Chemistry · Coordination Compounds · Set 9 (Q241-270)
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241. $Secondary valences of the following complexes based on their reactions with excess AgNO_{3} are Formula of the Moles of AgCl precipitated Complexes per mole of complex (I) CoCl_{3} \cdot 6 H_{2} O 3 (II) NiCl_{3} \cdot 6 H_{2} O 2 (III) Co (SO_{4}) Br \cdot 5 NH_{3} 1 I II III$ (1) $4 6 6$ (2) $6 4 4$ (3) $6 4 6$ (4) $6 6 6$ 242. $The correct order of the following complexes in terms of their crystal field stabilization energies is:$ (1) $(Co (NH_{3})_{4})^{2 +} < (Co (NH_{3})_{6})^{2 +} < (Co (en)_{3})^{3 +} < (Co (NH_{3})_{6})^{3 +}$ (2) $(Co (NH_{3})_{6})^{2 +} < (Co (NH_{3})_{6})^{3 +} < (Co (NH_{3})_{4})^{2 +} < (Co (en)_{3})^{3 +}$ (3) $(Co (en)_{3})^{3 +} < (Co (NH_{3})_{6})^{3 +} < (Co (NH_{3})_{6})^{2 +} < (Co (NH_{3})_{4})^{2 +}$ (4) $(Co (NH_{3})_{4})^{2 +} < (Co (NH_{3})_{6})^{2 +} < (Co (NH_{3})_{6})^{3 +} < (Co (en)_{3})^{3 +}$ 243. $Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27]$ (1) $(Cr (H_{2} O)_{6})^{2 +}$ (2) $(Fe (H_{2} O)_{6})^{2 +}$ (3) $(Co (H_{2} O)_{6})^{2 +}$ (4) $(Mn (H_{2} O)_{6})^{2 +}$ 244. $Which complex among the following gives a white precipitate on treatment with an aqueous solution of barium chloride?$ (1) $(Pt (NH_{3})_{4} Br_{2}) Cl_{2}$ (2) $(Co (NH_{3})_{5} SO_{4}) NO_{2}$ (3) $(Co (NH_{3})_{5} NO_{2}) SO_{4}$ (4) $(Pt (NH_{3})_{4} Cl_{2}) Br_{2}$ 245. $Which of the following complex has a possibility to exist as meridional isomer?$ (1) $[Co (N H_{3})_{3} (N O_{2})_{3}]$ (2) $[Pt (N H_{3})_{2} C 1_{2}]$ (3) $[Co(en)_{2} C l_{2}]$ (4) $[Co (e n)_{3}]$ 246. $Identify the correct trend given below: (Atomic No.: Ti = 22, Cr = 24 and Mo = 42)$ (1) $Δo of [Cr(H2O)6]2+ < [Mo(H2O)6]2+ and Δo of [Ti(H2O)6]3+ < [Ti(H2O)6]2+$ (2) $Δo of [Cr(H2O)6]2+ > [Mo(H2O)6]2+ and Δo of [Ti(H2O)6]3+ > [Ti(H2O)6]2+$ (3) $Δo of [Cr(H2O)6]2+ > [Mo(H2O)6]2+ and Δo of [Ti(H2O)6]3+ < [Ti(H2O)6]2+$ (4) $Δo of [Cr(H2O)6]2+ < [Mo(H2O)6]2+ and Δo of [Ti(H2O)6]3+ > [Ti(H2O)6]2+$ 247. $The number of complexes from the following with no electrons in the t_{2} orbital is TiCl_{4}, (MnO_{4})^{-}, (FeO_{4})^{2 -}, (FeCl_{4})^{-}, (CoCl_{4})^{2 -}$ (1) $1$ (2) $4$ (3) $3$ (4) $2$ 248. $An octahedral complex is formed when hybrid orbitals of the following type are involved$ (1) $d^{2} s p^{3}$ (2) $s p^{3}$ (3) $s p^{2} d^{2}$ (4) $ds p^{2}$ 249. $The spin only magnetic moment value (in Bohr magneton units) of Cr (C O)_{6} is :$ (1) $0$ (2) $2.84$ (3) $4.90$ (4) $5.92$ 250. $On treatment of 100 mL of 0.1 M solution of C o C l_{3} . 6 H_{2} O with excess A g N O_{3}; 1.2 \times 1 0^{22} ions are precipitated. The complex is :$ (1) $[Co(H_{2} O)_{3} C l_{3}]. 3 H_{2} O$ (2) $[Co (H_{2} O)_{6}] C l_{3}$ (3) $[Co (H_{2} O)_{5} Cl] C l_{2} . H_{2} O$ (4) $[Co(H_{2} O)_{4} C l_{2}]Cl. 2 H_{2} O$ 251. $Match List I with List II List I Coordination entity A. [CoCl(N H_{3})_{5}]^{2 +} B. [Co(N H_{3})_{6}]^{3 +} C. [Co(CN)_{6}]^{3 -} D. [Cu(H_{2} O)_{4}]^{2 +} List II Wavelength of light absorbed in nm I. 310 II. 475 III. 535 IV. 600 Choose the correct answer from the options given below :-$ (1) $A-IV, B-I, C-III, D-II$ (2) $A-III, B-II, C-I, D-IV$ (3) $A-III, B-I, C-II, D-IV$ (4) $A- II, B-III, C-IV, D-I$ 252. $The complex with highest magnitude of crystal field splitting energy (_{0}^{∆}) is$ (1) $[T i (O H_{2}) 6]^{3 +}$ (2) $[Cr(O H_{2})_{6}]^{3 +}$ (3) $[Mn(O H_{2})_{6}]^{3 +}$ (4) $[Fe(O H_{2})_{6}]^{3 +}$ 253. $A magnetic moment of 1.73 BM will be shown by one among the following :$ (1) $[Ni(CN)4]2-$ (2) $TiCl4$ (3) $[CoCl6]4-$ (4) $[Cu(NH3)4]2+$ 254. $Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The spin only magnetic moment value for [Fe(CN)_{6}]^{3 -} is 1.74 BM, whereas for [Fe(H_{2} O)_{6}] [Fe (H_{2} O)_{6}]^{3 +} is 5.92 BM. Reason B: In both complexes, Fe is present in +3 oxidation state. choose the correct answer from the options given below:$ (1) $A is false but R is true$ (2) $A is true but R is false$ (3) $Both A and R are true but R is NOT the correct explanation of A$ (4) $Both A and R are true and R is the correct explanation of A$ 255. $The pair having the same magnetic moment is : [At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]$ (1) $[Cr(H2O)6]2+ and [Fe(H2O)6]2+$ (2) $[Mn(H2O)6]2+ and [Cr(H2O)6]2+$ (3) $[CoCl4]2- and [Fe(H2O)6]2+$ (4) $[Cr(H2O)6]2+ and [CoCl4]2-$ 256. $In an octahedral structure, the pair of d orbitals involved in d^{2} s p^{3} hybridisation is$ (1) $d_{x^{2} - y^{2}}, d_{z^{2}}$ (2) $d_{x z}, d_{x^{2} - y^{2}}$ (3) $d_{z^{2}}, d_{x z}$ (4) $d_{x y}, d_{y z}$ 257. $Match List I with List II List I Complex (A) [Cu(N H_{3})_{6}]^{2 +} (B) [Ti(H_{2} O)_{6}]^{3 +} (C) [Fe(CN)_{6}]^{3 -} (D) [N i F_{6}]^{4 -} List II CFSE (_{0}^{∆}) (I) -0.6 (II) -2.0 (III) -1.2 (IV) -0.4 Choose the correct answer from the options given below:$ (1) $A(III), B(IV), C(I), D(II)$ (2) $A(I), B(IV), C(II), D(III)$ (3) $A(I), B(II), C(IV), D(III)$ (4) $A(II), B(III), C(I), D(IV)$ 258. $The covalency and oxidation state respectively of boron in [BF_{4}]^{-}, are$ (1) $3 and 5$ (2) $3 and 4$ (3) $4 and 4$ (4) $4 and 3$ 259. $For a d^{4} metal ion in an octahedral field, the correct electronic configuration is :$ (1) $t_{2 g}^{4} e_{g}^{0} When Δ_{0} < P$ (2) $t_{2 g}^{3} e_{g}^{1} When Δ_{0} > P$ (3) $e_{g}^{2} t_{2 g}^{2} When Δ_{0} < P$ (4) $t_{2 g}^{3} e_{g}^{1} When Δ_{0} < P$ 260. $Which of the following will be able to show geometrical isomerism?$ (1) $M A_{2} B_{2} -Tetrahedral$ (2) $MABCD -Tetrahedral$ (3) $M A_{3} B -Square planar$ (4) $MABCD -Square planar$ 261. $The ionization isomer of [Cr (H_{2} O)_{4} Cl (N O_{2})]Cl is :$ (1) $[Cr (H_{2} O)_{4} (O_{2} N)] C l_{2}$ (2) $[Cr(H_{2} O)_{4} C l_{2}](N O_{2})$ (3) $[Cr (H_{2} O)_{4} Cl(ONO)]Cl$ (4) $[Cr(H_{2} O)_{4} C l_{2} (N O_{2})]. H_{2} O$ 262. $The correct order of magnetic moments (only spin value in BM) among is :$ (1) $Fe(CN)_{6}^{4-} > [C o C l_{4}]^{2-} > [M n C l_{4}]^{2-}$ (2) $[M n C l_{4}]^{2-} > [Fe(CN)_{6}]^{4-} > [C o C l_{4}]^{2-}$ (3) $[Fe(CN)_{6}]^{4-} > [M n C l_{4}]^{2-} > [C o C l_{4}]^{2-}$ (4) $[M n C l_{4}]^{2-} > [C o C l_{4}]^{2-} > [Fe(CN)_{6}]^{4-}$ 263. $The 'spin only' magnetic moment (in units of Bohr magneton, μ_{B}) of N i^{2 +} in aqueous solution would be (atomic number Ni = 28)$ (1) $2.84$ (2) $4.80$ (3) $0$ (4) $1.73$ 264. $Two complexes (Cr (H_{2} O)_{6}) Cl_{3} (A) and (Cr (NH_{3})_{6}) Cl_{3} (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is:$ (1) $Δ_{0} values of (A) and (B) are calculated from the energies of violet and yellow light, respectively.$ (2) $both are paramagnetic with three unpaired electrons.$ (3) $both absorb energies corresponding to their complementary colors.$ (4) $Δ_{0} value for (A) is less than that of (B)$ 265. $The formula of tris (ethane - 1, 2- diamine) cobalt (III) sulphate is:$ (1) $(Co (H_{2} NCH_{2} CH_{2} NH_{2})_{3}) SO_{4}$ (2) $(Co (H_{2} NCH_{2} CH_{2} NH_{2})_{3})_{3} (SO_{3})_{2}$ (3) $(Co (CH_{3} CH_{2} NHNH_{2})_{3})_{2} (SO_{4})_{3}$ (4) $(Co (H_{2} NCH_{2} CH_{2} NH_{2})_{3})_{2} (SO_{4})_{3}$ 266. $Which of the following metal ions has a calculated magnetic moment value of 24 BM ?$ (1) $Mn^{2 +}$ (2) $Fe^{2 +}$ (3) $Fe^{3 +}$ (4) $Co^{2 +}$ 267. $An excess of A g N O_{3} is added to 100 m L of a 0.01 M solution of dichlorotetraaqua‐ chromium (III) chloride. The number of moles of A g C l precipitated would be$ (1) $0.003$ (2) $0.01$ (3) $0.001$ (4) $0.002$ 268. $The number of unpaired d-electrons in (Co (H_{2} O)_{6})^{3 +} is$ (1) $2$ (2) $1$ (3) $0$ (4) $4$ 269. $Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: Mn = 25; Fe = 26) (A) [F e F_{6}]^{3 -} (B) [Fe(CN)_{6}]^{3 -} (C) [M n C l_{6}]^{3 -} (high spin) (D) [Mn(CN)_{6}]^{3 -}$ (1) $A<B<D<C$ (2) $B<D<C<A$ (3) $A<C<D<B$ (4) $B<D<A<C$ 270. $Which of the following complex ions is expected to absorb visible light? (At. no Zn = 30, Sc = 21, Ti = 22, Cr = 24)$ (1) $[Sc(H2O)3(NH3)3]3+$ (2) $[Ti(en)2(NH3)2]4+$ (3) $[Cr(NH3)6]3+$ (4) $[Zn(NH3)6]2+$