QUIZ - COORDINATION COMPOUNDS

SINGLE CORRECT OPTION TYPE

1. Which of the following complex has highest C O bond energy. (A) 2 2 23Cr H O Cl .Br .H O (B) 36Co CO (C) 6Mn CO

(D) 16V CO 2. Cis-trans isomerism is found in square planar complexes of the molecular formula ( when A and B are

monodentate ligands) (A) 4MA (B) 2 2MA B (C) 3MAB (D) 3MA B 3. Which one of the following complex exhibit chirality (A) 3-3Cr(ox) (B) 2cis PtCl (en) (C) 2 3 4cis RhCl (NH ) (D) 2 3Mer Co(NO ) (trien) 4. Which one of the following is correctly matched. (A) 3 4Cu(NH ) Cl is tetrahedral and 2 4Na Co(Cl) is square planar (B) 3 4Cu(NH ) Cl and 2 4Na Co(Cl) are tetrahedral (C) 3 4Cu(NH ) Cl is square planar and 2 4Na Co(Cl) is tetrahedral (D) 3 4Cu(NH ) Cl and 2 4Na Co(Cl) are square planar. 5. Identify the correct order of wavelength of light absorbed for the following complex ions 3- 3- 3+3+2 6 6 6 3

I II III IV[Co(H O) ] ,[Co(CN) ] ,[Co(I) ] ,[Co(en) ]

(A) III>I>IV>II (B) II>IV>I>III (C) III>I>II>IV (D) I>III>IV>II 6. The complexes given below are

A

A

M enen andA

AM

en

en (A) Position isomers (B) Identical (C) Geometrical isomers (D) Optical isomers

7. The number of geometrical isomers for octahedral 4 3 2CoCl (NH ) , square planar 2 2AuBr Cl and 2PtCl (en) are

(A) 2,2,2 (B) 2,2, no geometrical isomerism (C) 3,2,2 (D) 2,3, no geometrical isomerism 8. The EAN of metal atom in 2 2Fe(CO) (NO ) is (A) 34 (B) 36 (C) 37 (D) 35 9. The reaction 2 244 2 2 (aq) 2 (l)(aq) (aq)CoCl (H O) EDTA Co(EDTA) 4Cl 4H O is expected to (A) occur only at high temperature (B) be the feasible because the complex formed is more stable (C) proceed in backward direction due to higher charge on Co (D) to occur only under drastic conditions 10. Consider the complex 2 6 3Cr(H O) Cl , the hydrate isomer of this complex which shows facial form (A) gives 1 mole of AgCl with AgNO3 (B) does not exist (C) has an optically inactive trans form (D) shows reduction in weight on leaving it over conc. H2SO4

QUIZ - COORDINATION COMPOUNDS 11. Among the following, the species that is both paramagnetic and coloured is: (A) 24MnO (B) 26TiCl (C) 34VO (D) 2 2CrO Cl 12. Excess of KI reacts with 4CuSO solution and then 2 2 3Na S O solution is added to it. Which of the

following statements is incorrect for this reaction? (A) Evolved 2I is reduced (B) 2CuI is formed (C) 2 2 3Na S O is oxidized (D) 2 2Cu I is formed 13. Arrange the following in order of decreasing number of unpaired electrons. (I) 22 6Fe H O (II) 36Fe CN (III) 46Fe CN (IV) 32 6Fe H O (A) IV, I, II, III, (B) I, II, III, IV (C) III, II, I, IV (D) II, III, I, IV 14. Consider the following complexes: (I) 3 23 3Co NH NO (II) 3 2 3 24 2 2 4C0 NH NO Co NH NO (III) 3 2 3 25 2 4 2Co NH NO Co NH NO Which of the following is the correct comparison of freezing point of the solution of each complex

containing 24.8 gm. Solute per kg water? 2f H Ok 1.86 c m (A) I II III (B) III II I (C) II I III (D) I II III 15. Number of possible stereoisomers for 2 3 2Pt NO Py NH NH OH ? (A) 2 (B) 3 (C) 4 (D) 5 16. Which of the following will have two only stereoisomeric forms? (I) 3 33 3Cr NO NH (II) 3 3K Fe ox (III) 2 2CoCl en (IV) 32Co Br Cl ox (A) I only (B) I and II (C) III and IV (D) all of these

MULTIPLE CORRECT OPTION TYPE

17. In the separation of 2+Cu and 2+Cd in second group of qualitative analysis of cations, tetramine copper (II) sulphate and tetramine cadmium (II) sulphate react with KCN to form corresponding cyano complexes. Which one of the following option(s) of the complexes and their relative stability enables the separation 2+Cu and 2+Cd

(A) 3 4K Cu(CN) is less stable (B) 3 4K Cu(CN) is more stable (C) 2 4K Cd(CN) is more stable (D) 2 4K Cd(CN) is less stable 18. In the following IUPAC name of complexes is/are not correctly matched. (A) 3 5Na Fe(CN) NO -sodiumpentacyanonitrosylferrate(II) (B) 3 3Cr(en) Cl -Tris(ethylenediamine) Chromium (II) Chloride (C) 2 4 2Cr(H O) Cl Cl-TetraquodichloroChromium (I) Chloride (D) 3 5 4Co(ONO)(NH ) SO -nitropentamminecobalt(II) Sulphate 19. A complex of molecular formula 3 2CoCl .6H O can show geometrical isomerism. It can be rightly

represented as (A) 2 2 24Co H O Cl Cl.2H O (B) 2 36Co H O Cl (C) 2 2 25Co H O Cl Cl .H O (D) 2 3 23Co H O Cl 3H O 20. Which of the following complexes is/are achiral (A) cis- 3 22Pt NH Cl (B) 2 22Zn H O Cl -Tetrahedral (C) 42 4 3Pt C O (D) Tras- 23 4Pt NH BrCl

QUIZ - COORDINATION COMPOUNDS 21. Which of the following is correct (A) The order of the wavelength of light absorbed in visible region 3 3 32 3 5 3 6 6Co(H O)(NH ) Co(NH ) Co(CN) (B) The order of stability of the complex in aqueous solution 1 2 24 3 4 2 4Cu(CN) Cu(NH ) Co(H O) (C) 33 6Cr(NH ) is a inner orbital complex (D) Pd(+II), Pt(+II) and Au(+III) form square planar complex both with strong and weak field ligands 22. Which of the following statement(s) is/are correct. (A) Most of the four co-ordinated complexes of 2Ni ion are square planar rather than tetrahedral (B) The 32 6Fe H O ion is more paramagnetic than the 36Fe CN ion (C) Square planar complexes are more stable than octahedral complexes for Pt+2 (D) The 46Fe CN ion is paramagnetic but 36Fe CN is diamagnetic

INTEGER TYPE

23. A metal complex of formula 2 2 2Ma b c where a, b and c are unidentate can show several geometrical isomeric forms. The total number of such isomers are

24. A complex salt of formula 3 a b 2Cr(NH ) Cl .cH O has molar mass 277.5. When 1.388 g of it is treated with

excess of NaOH liberated NH3 which neutralizes 10mL of 1 M HCl. What is the value of a. 25. How many isomers are possible for the complex 3 2 2Pt(NH ) (SCN) 26. The complex 2 2Rh(NO )(SCN)(en) can exist in total number of isomers. If isomers are X. Then, the

value of X/2 27. Total number of unpaired electrons in the following complexes is 2 2 6 2 6K Ba Co(NO ) and Na FeF 28. Find out the number of 3d electrons occupied in 2gt orbitals of hydrated 3+Cr ion (octahedral) 29. A substance is found to have a magnetic moment of 3.9 BM. How many unpaired electrons does it

contain? 30. How many short Cr O bonds are present in dichromate ion? 31. The geometrical isomers shown by 33Co(ox) is A and that of 3 3 3CoCl (NH ) is B. The value of A +

B. Comprehension-1 The coordination number of 2Ni is 4

2NiCl KCN excess A cyanocomplex 2NiCl conc.HCl excess B chlorocomplex

Based on this passage answer the following: 32. Predict the magnetic nature of A and B (A) Both are diamagnetic (B) A is diamagnetic and B is paramagnetic with one unpaired electron (C) A is diamagnetic and B is paramagnetic with two unpaired electrons (D) Both are paramagnetic 33. The hybridization of A and B are (A) 2 3dsp ,sp (B) 3 3sp ,sp (C) 2 2dsp ,dsp (D) 3 2 3sp d ,sp

QUIZ - COORDINATION COMPOUNDS Comprehension-2 In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligand bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin paired complexes except for vanadium metal. 34. The increase in bond length in CO as compared to carbon monoxide is due to (A) The donation of lone pair of electrons on the carbon into a vacant orbital of the metal atom (B) The donation of pair of electrons from a filled d-orbital of metal into the vacant antibonding

* orbital of carbon monoxide. (C) Electron pairs are only donated from CO to metal (D) Due to small size of carbon atom which is donor atom in it. 35. Which one of the following metal carbonyls involves the 2 3d sp hybridisation for the formation of metal

carbon -bonds and is paramagnetic. (A) 6Cr(CO) (B) 6V(CO) (C) 6Mo(CO) (D) 6W(CO) Comprehension-3 36. If P for 36Co CN then (A) high spin arrangement has low energy (B) low spin arrangement has high energy (C) high spin arrangement has high energy (D) none of these. 37. Which of the following is low spin complex? (A) 36Co CN (B) 36CoF (C) Both (a) and (b) (D) None of these 38. For which of the following P ? (A) 36CoF ( B) 36Co CN (C) Both of these (D) None of these Comprehension-4

In coordination chemistry there are a variety of methods applied to find out the structures of complexes. One method involves treating the complex with known reagents and from the nature of reaction, the formula of the complex can be predicted. An isomer of the complex Co(en)2(H2O)Cl2Br, on reaction with conc.H2SO4 it suffers loss in weight and on reaction with AgNO3 solution it gives a white precipitate which is soluble in excess of NH3 solution

39. The correct formula of the complex is (A) 2 2 2CoCl (en) .BrH O (B) 2 2CoCl(en) H O BrCl (C) 2 2 2CoBr(en) H O Cl (D) 2 2CoClBr(en) Cl.H O 40. If all the ligands in the coordination sphere of the above complex be replaced by SCN-, then the paramagnetic moment of the complex (due to spin only) will be

(A) 2.8 BM (B) 5.9 BM (C) 4.9 BM (D) 1.73 BM

41. If one mole of original complex is treated with excess Pb(NO3)2 solution, then the number of moles of white precipitate formed will be

(A) 0.5 (B) 1.0 (C) 1.5 (D) 3.0

QUIZ - COORDINATION COMPOUNDS

MATRIX-MATCH TYPE

42. Column-I Column-II

(A) 3 3 2CoBr .5NH .H O p) In one of the isomeric forms, the metal satisfied its secondary valences by only neutral molecules

(B) 4 3CoClSO .5NH q) Show Ionisation isomerism

(C) 3 2CrCl .6H O r) Show Hydrate isomerism

(D) 2 2Co(CNO) .6H O s) Show linkage isomerism

43

.Column-I Column-II A) [Pt(gly) ]2 p) Geometrical isomerism B) [Co(en) Cl ]Cl2 2 q) Optical isomerism C) [Cr(NH ) (py) (NO ) ]Cl3 2 2 2 2 r) Ionization isomerism D) [Pt(NH )(PH )Cl(SCN)]3 3 s) Linkage isomerism

44.

Column-I Column-II A) 2 5 2[Cr(H O) Cl]Cl p) Ionisation isomerism B) 2 2 2 4Na [Mn(H O) Cl ] q) Geometrical isomerism C) 3 2 2Pt(NH ) Cl(NO ) r) Outer orbital complex D) 4[Ni(CO) ] s) Oxidation number of central metal ion -0

t) sp3 hybridisation

QUIZ - COORDINATION COMPOUNDS

COORDINATION COMPOUNDS KEY 1. B 2 B 3. A 4. C 5. A 6. B 7. B 8. B 9. B 10. D

11. A 12. B 13. A 14. D 15. B 16 B

17. B, D 18. B, C, D 19. A, D 20. A,B,D 21. A,B,C,D 22 ABC 23. 5 24. 7 25. 6 26. 6 27. 7 28 3 29 3 30 6 31 2

32 C 33 A 34 B 35 B

36. D 37. A 38. A 39. D 40. C 41. A 42 A p, r; B q; C p, r ; D p, r, s 43. A- p; B- p,q; C- p,q,r,s; D- p,s 44. A- r; B- q,r ; C- q; D- s,t