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Question Bank No: 1

1. The coordination number and oxidation number of iron in the complex Fe $(CO)_{5}$ are respectively

a)		5,5
b)		5,0
c)		0,5
d)		5,3

2. The complex [Pt( ${NH}_{3}) (Py) (N H_{2} OH) (N O_{2})]$ can form n geometrical isomers. The value of n is

a)		1
b)		2
c)		4
d)		3

3. $K_{3} Co F_{6}$ is a high spin complex. The state of hybridisation of Co in this complex is

a)		$d^{2} {sp}^{3}$
b)		${sp}^{3}$
c)		${sp}^{3} d$
d)		${sp}^{3} d^{2}$

4. Which of the following is antidote for lead poisoning?

a)		Co ${CL}_{3}$
b)		Cis-platin
c)		EDTA
d)		Dmg

5. Which of the following system has maximum unpaired electrons?

a)		$d^{7} (octahedral, high spin)$
b)		$d^{9} (octahedral)$
c)		$d^{6} (tetahedral)$
d)		$d^{4} (octahedral, low spin)$

6. Which of the following is $π$ -acid ligand?

a)		ON $O^{-}$
b)		$C_{2} H_{4}$
c)		${NO}_{2}^{-}$
d)		C $N^{-}$

7. Pick up the correct statement about tetra-chloro-cuprate (I) ion

a)		It has tetrahedral geometry
b)		Copper assumes ds $p^{2}$ hybrid state
c)		It is a trivalent anion
d)		It has unpaired electrons

8. The number of unpaired electrons present in [Cr $(N H_{3})_{6}]^{3 +}$ , an octahedral complex is

a)		2
b)		3
c)		4
d)		5

9. Which of the following complexes is inner orbital complex?

a)		Ni $(CO)_{4}$
b)		[Fe $(CN)_{6}] 4 -$
c)		[Co $F_{6}]^{3 -}$
d)		[Ni $(N H_{3})_{6}]^{2 +}$

10. [Cu ${({NH}_{3})}_{4}]^{2 +}$ is square planar complex? The number of unpaired electrons and hybrid state of copper are respectively

a)		4, ds $p^{2}$
b)		1, ${sp}^{3}$
c)		1, ds $p^{2}$
d)		4, ${sp}^{3}$

11. What is the effective atomic number of Pd in tetrachloropalladium (II) ion?

a)		54
b)		59
c)		55
d)		56

12. In Tollen's reagent, the oxidation number, co-ordination number and effective atomic number of central metal ion are respectively

a)		+1,2,50
b)		+2,2,50
c)		2,+1,50
d)		+1,1,50

13. Which of the following is correct value of X in Cr $(CO)_{x}$ ?

a)		2
b)		4
c)		6
d)		Unpredictable

14. The EAN of Ni in Ni ${(CN)}^{2 -}_{4}$ is

a)		34
b)		35
c)		36
d)		28

15. The correct IUPAC name of M $n_{3} (CO)_{12}$ is

a)		Magnetic dodecylcarbonyl (O)
b)		Dodecacarbonyl manganese (O)
c)		Dodecacarbonyl manganese (II)
d)		Dodecacarbonyl trimanganese (O)

16. The co-ordination number of cobalt in [Co $(en)_{2} {Br}_{2}] C L_{2}$ is

a)		2
b)		4
c)		6
d)		8

17. An octahedral complex is formed when hydrid orbitals of the following type are involved

a)		${Sp}^{3}$
b)		${dsp}^{3}$
c)		${sp}^{3} d^{2}$
d)		${sp}^{3} d$

18. Change in composition of co-ordination sphere yields which type of isomers?

a)		Optical
b)		geometrical
c)		ionization
d)		none of these

19. In octahedral crystal field splitting, the number of orbitals pushed down in energy are

a)		3
b)		2
c)		5
d)		0

20. A group of atoms can function as a ligand only when

a)		It is a small molecule
b)		It has an unshared electron pair
c)		It is an negatively charge ion
d)		It is positively charged ion

21. In the complex with formula ${MCl}_{3} . {4 H}_{2} O,$ the coordination number of the metal M is six and there is no molecule of hydration in it.The volume of 0.1 M AgN $O_{3}$ solution needed to precipitate the free chloride ions in 200mL of 0.01 M solution of the complex is

a)		40mL
b)		20mL
c)		60mL
d)		80mL

22. Among the following which are ambidentate ligands?
a. ${NO}_{2}^{-},$ b. ${NO}_{3}^{-},$ c. ${EDTA}^{4 -}$ d. $C_{2} O_{4}^{2 -}$ e. ${SCN}^{-}$ f. $H_{2} {NCH}_{2} {CH}_{2} {NH}_{2}$

a)		a and b
b)		c and d
c)		a and f
d)		a and e

23. Both ${Co}^{3 +}$ and ${Pt}^{4 +}$ have a coordination number of six.Which of the following pairs of complexes will show approximately the same electrical conductance for their 0.001 M acqueous solutions?

a)		${CoCl}_{3} .4 {NH}_{3}$ and ${PtCl}_{4} . 4 {NH}_{3}$
b)		${CoCl}_{3} .3 {NH}_{3}$ and ${PtCl}_{4} .5 {NH}_{3}$
c)		${CoCl}_{3} .6 {NH}_{3}$ and ${PtCl}_{4} .5 {NH}_{3}$
d)		${CoCl}_{3} .6 {NH}_{3}$ and ${PtCl}_{4} .3 {NH}_{3}$

24. Which of the following statements is not correct?

a)		The complexes ${[{NiCl}_{4}]}^{2 -}$ and ${[{Ni (CN)}_{4}]}^{2 -}$ differ in the state of hybridization of nicket
b)		The complexes ${[{NiCl}_{4}]}^{2 -}$ and ${[{Ni (CN)}_{4}]}^{2 -}$ differ in the magnetic properties
c)		The complexes ${[{NiCl}_{4}]}^{2 -}$ and ${[{Ni (CN)}_{4}]}^{2 -}$ differ in geometry
d)		The complexes ${[{NiCl}_{4}]}^{2 -}$ and ${[{Ni (CN)}_{4}]}^{2 -}$ differ in primary valencies of nickel

25. When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to the formation of

a)		${CrO}_{3}$
b)		${C r_{2} O}_{3}$
c)		${CrO}_{5}$
d)		$Cr {O_{4}}^{- 2}$

26. The increasing order of the crystal field splitting power of some common ligands

a)		$H_{2} O < {OH}^{-} < {{Cl}^{-} < F}^{-} < {CN}^{-}$
b)		$H_{2} O < {Cl}^{-} < {OH}^{-} < {CN}^{-} < F^{-}$
c)		${CN}^{-} < H_{2} O < {OH}^{-} < F^{-} < {Cl}^{-}$
d)		${{Cl}^{-} < F}^{-} < {OH}^{-} < {H_{2} O < CN}^{-}$

27. Fac - Mer isomerism is associated with which one of the following complexes? (M=central metal)

a)		$[M {(AA)}_{2}]$
b)		$[M {A_{3} B}_{3}]$
c)		$[M {(AA)}_{3}]$
d)		[MABCD]

28. The correct order of ionic radii of $Y^{3 +} {, La}^{3 +}, {Eu}^{3 +}$ and ${Lu}^{3 +}$ is

a)		$Y^{3 +} {< La}^{3 +} < {Eu}^{3 +}$ ${< Lu}^{3 +}$
b)		${Lu}^{3 +} < {Eu}^{3 +} {< La}^{3 +} < Y^{3 +}$
c)		${La}^{3 +} < {Eu}^{3 +} {< Lu}^{3 +} < Y^{3 +}$
d)		$Y^{3 +} {< Lu}^{3 +} < {Eu}^{3 +}$ ${< La}^{3 +}$

29. ${KMnO}_{4}$ is a strong oxidizing agent in acid medium. To provide acid medium $H_{2} {SO}_{4}$ is used instead of HCl.This is because

a)		$H_{2} {SO}_{4}$ is a stronger acid that HCl
b)		HCl is oxidized by ${KMnO}_{4}$ to ${Cl}_{4}$
c)		$H_{2} {SO}_{4}$ is a dibasic acid
d)		Rate is faster in the presence of $H_{2} {SO}_{4}$

30. The dark blue colour of the solution formed when excess of ammonia is added to a solution of copper (11) sulphate is due to the presence of the ion

a)		$[Cu {(OH)}_{4} {(H_{2} O)}_{2}]^{2 -}$
b)		$[Cu {(H_{2} O)}_{6}]^{2 +}$
c)		$[Cu {({NH}_{3})}_{2} {(H_{2} O)}_{4}]^{2 +}$
d)		$[Cu {({NH}_{3})}_{4} {(H_{2} O)}_{2}]^{2 +}$

31. The formula of compound which gives violet colour in Lassagine's test for sulphur with sodium nitroprusside is

a)		${Na}_{4}$ $[Fe {(CN)}_{6} S]$
b)		${Na}_{4}$ $[Fe {(CN)}_{5} NCS]$
c)		${Na}_{4}$ $[Fe {(CN)}_{5} NOS]$
d)		${Na}_{2} [Fe {(CN)}_{5} NOS]$

32. ${CrO}_{5}$ has a structure as shown
d&fflock-q29
The oxidation number of chromium in the above compound is

a)		4
b)		5
c)		6
d)		10

33. Match list 1 with 11 and select the correct answer using the codes given below the lists
$\begin{matrix} List 1 : Metal ions \\ 1. {Cr}^{3 +} \\ 2. {Fe}^{2 +} \\ 3. {Ni}^{2 +} \\ 4. {Mn}^{2 +} \end{matrix}$ $\begin{matrix} List 11 : Magnetic moment (B . M) \\ a . \sqrt{35} \\ b . \sqrt{30} \\ c . \sqrt{24} \\ d . \sqrt{15} \\ e . \sqrt{8} \end{matrix}$

a)		1-a, 2-c, 3-e, 4-d
b)		1-b, 2-c, 3-e, 4-a
c)		1-d, 2-c,3-e, 4-a
d)		1-d, 2-e, 3-c, 4-a

34. Which of the following complexes are NOT correctly matched with the hybridization of their central metal ion?
1) $[Ni {(CO)}_{4}] {sp}^{3}$
2) $[Ni {(CN)}_{4}]^{2 -} {sp}^{3}$
3) $[{COF}_{6}]^{3 -} {d^{2} sp}^{3}$
4) $[Fe {(CN)}_{6}]^{3 -} {sp}^{3} d^{2}$
Select the correct answer using the codes given below

a)		1 and 2
b)		1 and 3
c)		2 and 4
d)		2,3 and 4

35. Which of the following has the highest molar conductivity?

a)		Diamminedichloroplatinum(11)
b)		Tetraamminedichlorocobalt (111) chloride
c)		Potassium hexacyanoferrate (11)
d)		Hexaaquochromium (111) bromide

36. When excess ammonia is added to ${CuSO}_{4}$ solution the deep blue complex obtained is

a)		Tetrahedral and Paramagnetic
b)		Tetrahedral and Diamagnetic
c)		Square Planar and Diamagnetic
d)		Square Planar and Paramagnetic

37. Which of the following metals,Fe, Zn, Pb, Ag and Pt. DO NOT give a metal nitrate on treatment with concentrated ${HNO}_{3}$ ?

a)		Fe and Zn
b)		Fe and Pt
c)		Pb,Ag and Pt
d)		Fe,Ag and Pt

38. Which is not true of the coordination compond a) $[Co {(en)}_{2} C l_{2}] Cl ?$

a)		exhibits geometrical isomerism
b)		exhibits optical isomerism
c)		exhibits ionization isomerism
d)		is c cationic complex

39. a) $K_{4}$ $[Fe {(CN)}_{6}]$ b) $K_{3}$ $[Cr {(CN)}_{6}]$ c) $K_{3}$ $[Co {(CN)}_{6}]$ d) $K_{2}$ $[Ni {(CN)}_{4}] .$ Select the complexes which are diamagnetic

a)		a,b and c
b)		b,c and d
c)		a,c and d
d)		a,b and d

40. Effective magnetic moment of ${Sc}^{3 +}$ ion is

a)		1.73
b)		0
c)		5.92
d)		2.83

41. The blue colour obtained in the Lassaigne test is due to formation of the compound

a)		${Na}_{4}$ $[Fe {(CN)}_{6}]$
b)		${Fe}_{3}$ $[Fe {(CN)}_{6}]_{4}$
c)		${Fe}_{4}$ $[Fe {(CN)}_{6}]_{3}$
d)		${Fe}_{4} [Fe {(CN)}_{6}]$

42. The number of chloride ion/s produced by complex Tetraamminedichloroplatinum (1V) chloride in an aqueous solution is

a)		four
b)		two
c)		one
d)		three

43. Match the lists 1 ans 11 and pick the correct matching from the codes given below
$\begin{matrix} List 1 & List 11 \\ (Complex) & (Structure & Magnetic moment) \\ a . {[Ag {(CN)}_{2}]}^{-} & 1. Square planar and 1.73 B \\ b . {[Cu {(CN)}_{4}]}^{3 -} & 2. linear ans O \\ c . {[Fe {(CN)}_{6}]}^{3 -} & 3 . octahectral and O \\ d . {[Cu {(N H_{3})}_{4}]}^{2 +} & 4. tetrahedral and O \\ e . {[Fe {(CN)}_{6}]}^{-} & 5. octahectral and 1.73 BM \end{matrix}$

a)		a-2, b-4, c-5, d-1, e-3
b)		a-5, b-4, c-1, d-3, e-2
c)		a-1, b-3, c-4, d-2, e-3
d)		a-4, b-5, c-2, d-1, e-3

44. Which of the following forms colourless compounds?

a)		${Sc}^{3 +}$
b)		$V^{3 +}$
c)		${Ti}^{3 +}$
d)		${Cr}^{3 +}$

45. In Nessler's reagent for the setection of ammonia the active species is

a)		${Hg}_{2} C l_{2}$
b)		${Hg}^{2 +}$
c)		${Hg}_{2} l_{2}$
d)		${Hg l_{4}}^{2 -}$

46. Development of a photographic plate involves the use of

a)		an oxidizing agent
b)		a complexing agent
c)		a precipitating agent
d)		a reducing agent

47. In the silver plating of copper, K[Ag(C ${N)}_{2}]$ is used instead of AgN $O_{3} .$ The reason is

a)		A thin layer of Ag is formed on Cu
b)		More voltage is required
c)		${Ag}^{+}$ ions are completely removed from solution
d)		Less availability of ${Ag}^{+}$ ions, as Cu cannot displace Ag from [Ag (CN $)_{2}]^{-}$ ion

48. Consider the following complex [Co( ${{NH}_{3})}_{5} C O_{3}] C {lO}_{4}$
The coordination number, oxidation number, number of d-electrons and number of unpaired d-electrons on the metal are respectively

a)		6,3,6,0
b)		7,2,7,1
c)		7,1,6,4
d)		6,2,7,3

49. The effective atomic number of iron in [Fe(C ${N)}_{6}]^{3 -}$

a)		34
b)		36
c)		37
d)		35

50. The IUPAC name of $K_{3}$ [Ir( $C_{2} O_{4})_{3}]$ is

a)		Potassium trioxalatoiridium (111)
b)		Potassium trioxalatoiridate (111)
c)		Potassium tris(oxalato)iridium (111)
d)		Potassium tris(oxalato)iridate (111)