PA SEK teon es Q. 90, Select and write the most appropriate answer from the given alternatives for each subquestion (1 mark each) +1. The oxidation state of cobalt ion in the complex [Co(NH,),Br]SO, is (@) +2 &) +3 @ +1 @ +4 * 2. TUPAC name of the complex [Pt(en),(SCN),]* is (a) bis(ethylenediamine)dithiocyanatoplatinum(1V) ion (©) cbis(ethylenediamine)dithiocyantoplatinate(IV) ion (©) dicyanatobis(ethylenediamine)platinate(IV) ion (@) bis(ethylenediammine)dithiocynatoplatinate(IV) ion 3. Formula for the compound sodium hexacyno- ferrate(II) is @) [NaFe(CN),] _(b) Na,{Fe(CN) (©) Na[Fe(CN),J] — (d) Na,[Fe(CN),] * 4. Which of the following complexes exist as cis and trans isomers ? (2) [CrQNH),CL)- 2) [CowNH,),Br* (3) [PtCl,Br,}*~ (square planar) (4) [FeCl(NCS),]° (tetrahedral) (@) Land 3 (b) 2and3 (©) Land2 (@) 4only % 5. Which of the following complexes are chiral ? ) [Cofen),C1, 2) [Peenjch] 3) [CHC,0,),?~ (4) [Co(NH,),Cl)" (@) 1and3 (b) 2and3 (©) land 4 @ 2and4 + 6. On the basis of CFT predict the number of unxpaired electrons in [CrF,}~ . @1 2 ©3 @4 = ° 11, L 2 B . When an excess of AgNO, is added to the comp? one mole of AgCl is precipitated. The formula of je complex is (a) [CoCL(NH,),JCL (b) [CoClONH,),JCl, (©) [CoCl(NH,)3] (4) [Co(NH,),JC, The sum of coordination number and oxidation number of M in [M(en),C,0,]Clis (a) 6 )7 @9® @8 The coordination number of cobalt in the comple, [Co(en),Br,]Cl, is @4 5 ©6 @7 EDTA combines with cations to form (a) chelates (©) polymers (©) clathrates (d) non-stoichiometrie compounds Which one of the following compounds can exhibit coordination isomerism ? (a) [(Co(en),C1,]Br (b) [CoWH,)J [CHCN),] (©) [Cofen),]C1, @ [Co(NH,).NO,ICL, . Which of the following compounds can exhibit linkage isomerism ? (a) [Cofen),JCl, (©) [Co(en),NO,BrIC1 (®) [Co(en),CI,]CI (@ [Co(NH,),CUBr, . Oxidation number of cobalt in K[CoCl,] is @ +1 ® -1 © +3 @-3 The correct structure of [Cr(H,O),]* is ... (@) octahedral (b) tetrahedral (©) square pyramidal (@) trigonal bipyramidal Amongst the following ions which one has the high- est paramagnetism ? @) [Cr(H,0)* © [CuH,O)* (©) [Fe(H,0),7* @) [2nH,0),*16, 17. 18. 19. 20. 2. 22. 23. ‘The ycometry of [Ni 'N),}' and [NiCI,}°? are (a) both tetrahedral (b) both square planar () tetrahedral and square planar respectively (d) square planar and tetrahedral respectively The complex cis-[P(NH,),CI,] is used in treatment of cancer under the name. (b) Eqanit (4) tansplatin (a) Aspirin (©) cisplatin [Co(NH,),) is an in nature. orbital complex and is .... (a) inner, paramagnetic (b) inner, dimagnetic (6) outer, paramagnetic (d) outer, dimagnetic ‘The IUPAC name of [Ni(Co),] is (a) tetra carbonyl nickel (O) (b) tetra carbonyl nickel (II) (c) tetra carbonyl nickelate (O) (d) tetra carbonyl nickelate (11) The number of ions produced by the complex [Co(NH,),CI,] Cl is @! 2 ©3 @4 ‘The dimagnetic species is (a) [N(CN),F> —_(b) (NIC (©) (CoCl,~ (d) [CoFP~ Which one of the following is an inner orbital complex as well as dimagnetic in behaviour (Atomic no. Zn = 30, Cr = 24, Co = 27, Ni = 28) (a) [Zn(NH,),}* —(b) [CH(NH)* (©) [Co(NH,)F* — (@) (Ni(NH,),J" ‘Among [Ni(Co),], [Ni(CN),P°~s [NIC Po Species, the hybridisation states at the Nickel atom are respectively (a) sp’, dsp?, sp? (b) sp, dsp?, dsp? (©) dsp’, sp’, sp? (d) sp*, sp?, dsp* 30, 31. 32, 33. 34, 35. The complex which viola |. ‘The strongest ligand in the following is, (a) CN” (by Br (e) HO™ (a) FH Magnetic moment of (NH,), (MnBr,) is... BM (a) 5.91 (by 4.91 (6) 3.91 (4) 2.91 es EAN rule is, (a) Fe(CO), (c) Ni(CO), (b) [Fe(CN),P (d) (Zn(NH,),ICl, EDTA is a ligand of the type (a) bidenta (b) tridentate (c) tetradentate—(d) hexadentate . The cationic complex among the following is (a) K,[Fe(CN),] (b) Ni(CO), () KyHtel, (A) [CoiNH,) JCI, If Z is the atomic number of a metal, X is number of electrons lost forming metal ion and Y is the number of electrons from the ligands then EAN is (@Z+X+Y (bt) X-Z+Y¥ () Z-X4+Y — @) X#Z-Y Octahedral complex has hybridisation, (a) dsp? (b) d’sp> (©) ap? (A) asp? Inner complex has hybridisation, (a) dsp? (b) sp’? (0) sp'd (A) spd? The number of unpaired electrons in [Co(NH, "is @o @®1 ©2 @4 ‘The number of unpaired electrons in [NiCI,~ and [Ni(CN),}°~ are respectively, @ 22 (20 ©0,0 (1.2 ‘Among the following complexes, the highest magnitude of erystal field stabilisation energy will be for [Co(H,O),]"", (Co(CN),}°”. [CoONH,),}**. [(CoF.] (@) [Co(H,0),?* —_(b) [Co(CN),P~ © [COWNH,)" — @) [CoFP~ The number of unpaired electrons in a low spin octahedral complex ion of d” is @o ®t! @2 @3 snuanrnnine 4736. The number of unpaired electrons in a high spin : octahedral complex ion of d? is (a) 0 (b) 1 (c) 2 (d) 3 37. Ligand used in the estimation of hardness of water (a) EDTA (b) DBG (c) chloride (d) bromo 38. Which of the following complexes will give a white precipitate on treatment with a solution of barium nitrate ? {a) [Cr(NH,),SO,] Cl () [Co(NH,),Ci,] NO, (©) [Cr(NH,),Cl,] SO, (@) [CrCl,(4,0),] C1 39. What is effective atomic number of Fe (z = 26) in [Fe(CN),J*- 2 (@) 12) () 30 ©) 26 =) 36 40. Cisplatin compound is used in the treatment of (@) malaria (b)}-eaticer (©) Alps (d) yellow fever Answers 1. () +3 2. (a) bis(ethylenediamine)dithiocyanatoplatinum(IV) ion 3. (@) Na,fFe(CN),] 4. (a) Land 3 5. (a) Land3 6. (c) 3 7. (a) [CoCl,QNH,),JCL 7. 8. () & 9.65 6 10. (a) chelates » (b) [Co(NH,),] [Cr(CN),] 12. (c) [Co(en),NO,BrICl 13. (b) —1 14, (a) octahedral 15. (b) [Fe(H,0),* 16. (d) square planar and tetrahedral Fespectively 17. (c) cisplatin 18, (b) inner, dimagnetic 19. (a) tetra carbony! nickel (0) (b) 2 (a) [N(CN),P~ (6) [Co(NH,)* (a) sp, dsp*, sp* (a) CN- 25, (a) 5.91 (©) [Fe(CN)* (@) hexadentate 28, (d) [Co(NH,),JCL, (©) Z-X+Y 30. (4) dsp? 31. (a) dsp? 32. (a) 0 33. (b) 2,0 34, (b) [Co(CN),]°- . (b) (d) 3 . (a) EDTA . (c) [Cr(NH,),Cl,] SO, . (d) 36 . (b) cancer Be