384 + Interview Questions in CO-ORDINATION-COMPOUNDS IN GENERAL AWARENESS Page 1 InterviewSolution

1.	Give a ligand which is bidentate and given an example of the complex formed by the ligand..
Answer» `overset(..)NH_(2)-CH_(2)-CH_(2)-overset(..)NH_(2) or(en),[Co(en)_(2)Cl_(2)]NO_(3)`

Discussion

2.	Which of the following represents hexadentate ligand ?A. 2, 2 bipyridylB. DMGC. ethylenediamineD. None of these
Answer» Correct Answer - D None of them can donate six pair of electrons

Discussion

3.	Hypo is used in photography because of itsA. a strong oxidising agentB. a strong reducing agentC. a strong complexing agent nD. None of the above.
Answer» Correct Answer - C Hypo or `Na_(2)S_(2)O_(3)` is a complexing agent and forms soluble complex with AgBr.

Discussion

4.	Which of the following is most likely structure of `CrO_(3).6H_(2)O` if `1//3` of total chlorine of the compound is precipitated by adding `AgNO_(3)` to its aqueous solution ?A. `CrCl_(3).6H_(2)O`B. `[Cr(H_(2)O)_(3)Cl_(3)](H_(2)O)_(3)`C. `[CrCl_(2)(H_(2)O)_(4)]Cl.2H_(2)O`D. `[CrCl.(H_(2)O)_(5)]Cl_(2).H_(2)O`
Answer» Correct Answer - C Out of 3 Cl atoms, olny one Cl atom is ionisable. The other two Cl atoms are part of coordination sphere . Hence its structure is `[CrCl_(2)(H_(2)O_(4)]Cl.2H_(2)O`

Discussion

5.	The oxidation number of Fe in `K_(4)[Fe(CN))(6)]` isA. 3B. 2C. 0D. 1
Answer» Correct Answer - B `x + 6(-1) + 4 = 0 :.` x + 2

Discussion

6.	Which of the following organometallic compound is `sigma` and `pi`-bonded?A. `[Fe(eta^(5)-C_(5)H_(5))_(2)]`B. `[PtCl_(3)(eta^(2)-C_(2)H_(4))]`C. `[Co(CO)_(5)NH_(3)]^(2+)`D. `Al(CH_(3))_(3)`
Answer» Correct Answer - C Co ligand is bonded to the central metal atom through `sigma` and `pi`-bonding .

Discussion

7.	Chemical formula for in iron(III) hexacyanoferrate(II) isA. `Fe[Fe(CN)_(6)]`B. `Fe_(3)[Fe(CN)_(6)]`C. `Fe_(3)[Fe(CN)_(6)]_(4)`D. `Fe_(4)[Fe(CN)_(6)]_(3)`.
Answer» Correct Answer - B `underset("iron (III)")(Fe^(3+))underset("hexacyanoferrate (II)")([Fe(CN)_(6)]^(3-))` or `underset("iron" (III)"hexacyanoferrate(II)")(K_(4)[Fe(CN)_(6)]_(3))`

Discussion

8.	Why is the complex `[CoF_6]^(3-)` less stable than the complex `[Co(en)_3]^(3+)` ?
Answer» In the complex `[Co(en)_(3)]^(3+)` , the ligands en are cheating ligands while in the complex `[CoF_(6)]^(3-)` , the ligands `F^(-)` ions are monodentate in nature . The chelating ligands impart extra stability to the complex .

Discussion

9.	The oxidation number of `Pt` in `[Pt (C_(2)H_(4))Cl_(3))"]"^(ө)` isA. `+1`B. `+2`C. `+3`D. `+4`
Answer» Correct Answer - B Let O.N. of Pt = x O.N. of `C_(2)H_(4)` (ethylene) = 0 `:.` ` x+ 3 (-1) = -1` `x=+2`

Discussion

10.	Draw the structure of `[Pt(Cl_(3))(C_(2)H_(4))]`
Answer» The complex is known as Zeises salt.

Discussion

11.	The questions given below consist of Assertion (A) and Reason (R ) . Use the following key to select the correct answer. Assertion : The ligand `N_3^(-)` is named as nitrido. Reason : It is derived from `NH_3`.A. If both assertion and reason are correct and reason is correct explanation for assertion .B. If both assertion and reason are correct but reason is not correct explanation for assertion .C. If assertion is correct but reason is incorrectD. If both assertion and reason are incorrect
Answer» Correct Answer - d Correct assertion : The ligand `N_(3)^(-)` is named as azido . Correct reason : It is derived from `HN_3` .

Discussion

12.	The correct IUPAC name of `Fe(C_(5)H_(5))_(2)` isA. cyclopentadienyliron(II)B. bis(cyclopentadienyl)iron(II)C. dicyclopentadienylferrate(II)D. ferrocene
Answer» Correct Answer - B Factual problem based on the rules of nomenclature .

Discussion

13.	IUPAC name of `K_(3)[Fe(CN)_(6)]` isA. potassium hexacyanoferrate (II)B. potassium hexacyanoferrate(III)C. hexacyanoferrate(III)D. potassium ferricyanide
Answer» Correct Answer - B `K_(3)[Fe(CN)_(6)]` potassium hexacyanoferrate (III)

Discussion

14.	The shape of cuprammonium ion isA. OctahedralB. TetrahdralC. TrigonalD. Square planar
Answer» Correct Answer - D Shape of cuprammonium, `[Cu(NH_(3))_(4)]^(2+)` ion is square planar.

Discussion

15.	The coordination number of copper in cuprammonium sulphate isA. 2B. 3C. 4D. 6
Answer» Correct Answer - C `[Cu(NH_(3))_(4)]SO_(4)` cuprammonium sulphate Co-ordinate number of Cu in cuprammonium sulphate is 4.

Discussion

16.	How many ions per molecule should be produced in the solution when potash alum in dissolved in alrge excess of water ?A. 4B. 8C. 6D. 10
Answer» Correct Answer - B `K_(2)SO_(4).(Al_(2))(SO_(4))_(3).24H_(2)Ooverset("water")rarr 2K^(+) + 2Al^(3+) + 4SO_(4)^(2-) + 24H_(2)O`

Discussion

17.	`[Fe(CN)_(6)]^(4-)` and `[Fe(H_(2)O)_(6)]^(2+)` are of different colours in dilute solutions why?
Answer» In both the complexes , Fe is in + 2 oxidation state with `d^(6)` configuration. This means that it has four unoaired electrons. Both `CN^(-)` ion and `H_(2)O` molecules which act as ligands occupy different relative positions in the spectrochemical series. they differ in crystal field spliting energy `(Delta_(0))` . quite obviously , they absorb radiations corresponding to different wavelength/frequencies from the visible region of light. (VIBGYOR) and the transmitted colours are also different. this means that the complexes have different colours in solutions.

Discussion

18.	A solution of potassium ferrocyanide would contain â€¦.ionsA. 2B. 3C. 4D. 5
Answer» Correct Answer - D `K_(4)[Fe(CN)_(6)] (aq) hArr 4K^(+)(aq) + [Fe(CN)_(6)]^(4-) (aq)`

Discussion

19.	In sodium tetrafluorooxochromate (â€¦.), `Na_(3)[Cr(O)F_(4)]` the left out place should be filled with which of the following Roman unmeral?A. VIB. IIIC. IVD. None of these
Answer» Correct Answer - B The left out space should be filled by Roman numeral III because oxidation state of Cr in the compound is `+3`

Discussion

20.	Which of the following is organo-metallic compound ?A. `Ti(C_(2)H_(4))_(4)`B. `Ti(OC_(2)H_(5))_(4)`C. `Ti(OCOCH_(3))_(4)`D. `Ti(OC_(6)H_(5))_(4)`
Answer» Correct Answer - A An organic-metalllic compound has metal-carbon bond. Thus `Ti(C_(2)H_(4))_(4)` is an organometallic compound.

Discussion

21.	Which of the following metals from polynuclear complex ?A. NaB. MgC. MnD. All
Answer» Correct Answer - C Mn forms polynuclear complex, `Mn_(2)(CO)_(10)`.

Discussion

22.	The questions given below consist of Assertion (A) and Reason (R ) . Use the following key to select the correct answer. Assertion : `[Cu(NH_3)_4]^(2+)` is `sp^(3)` hybridised tetrahedral complex . Reason : `[Cu(NH_3)_4]^(2+)` is diamagnetic in nature .A. If both assertion and reason are correct and reason is correct explanation for assertion .B. If both assertion and reason are correct but reason is not correct explanation for assertion .C. If assertion is correct but reason is incorrectD. If both assertion and reason are incorrect
Answer» Correct Answer - d Correct assertion : `[Cu(NH_3)_4]^(2+)` is `dsp^(2) ` hybridised and square planar in nature. Correct reason : `[Cu(NH_3)_4]^(2+)` is paramagnetic in nature.

Discussion

23.	Calculate the overall complex dissociation equilibrium constant for the `[Cu(NH_3)_4]^(2+)` ion, given that `beta_4` for this complex is `2.1xx10^(13)`
Answer» The dissociation constant is the reciprocal of overall stability constant `beta_(4)` `I_(i) = 1/(beta_(4))= 1/(2.1 xx 10^(13) = 4.7 xx 10^(-14)`

Discussion

24.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. The total number of possible isomers for the complex compound `[Cu(NH_(3))_(4)][PtCl_(4)]` are :A. 3B. 6C. 5D. 4
Answer» Correct Answer - d d) it is the correct answer.

Discussion

25.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. Both geometrical and optical isomerism are shown byA. `[Co(en)_(2)Cl_(2)]^(+)`B. `[Co(NH_(3))_(5)Cl]^(2+)`C. `[Co(NH_(3))_(4)Cl_(2)]`D. `[Cr(OX)_(3)]^(3-)`
Answer» Correct Answer - a The compound shows both geometrical & optical isomerism.

Discussion

26.	Stereoisomerism arises on account of different positions and arrangement of lignads in space around the metal ion . These are classified into two types : (i) Geometrical isomerism is exhibited by octahedral and square planar complexes . (ii) Optical isomerism is shown when mirror images are non superimposable. The compound(s) that exhibi(s) geometrical isomerism is(are) :A. `[Pt(en)Cl_(2)]`B. `[Co(OH_(2))_(4)Cl_(2)]Cl`C. `[Pt(en)_(2)Cl_(2)]Cl_(2)`D. `[Pt(NH_(3))_(2).Cl_(2)]`
Answer» Correct Answer - c,d Both show geometrical isomerism.

Discussion

27.	When 0.01 mole of a cobalt complex is treated with excess of silver nitrate solution 4.035 g of silver chloride is precipitated. The formula of the complex is :A. `[Co(NH_(3))_(3)Cl_(3)]`B. `[Co(NH_(3))_(5)Cl]Cl_(2)`C. `[Co(NH_(3))_(6)]Cl_(3)`D. `[Co(NH_(3))_(4)Cl_(2)]NO_(3)`
Answer» Correct Answer - C Molar mass of AgCl = 143.5 g`mol^(-)` No . Of moles of AgCl precipitated = (4.305 g) / (143.4 g`mol^(-)`) = 0.03 mol 0.01 mole of complex precipitates AgCl = 0.03 mol 1.0 mole of complex precipitates AgCl = 3 mol This means that the complex provides three `Cl^(-)` ions in solution `therefore` Formula of complex = `[C0(NH_3)_6]Cl_3`

Discussion

28.	Which complex gives three chloride ions per formula unit ?A. `CrCl_(3).6H_(2)O`B. `CrCl_(3).5H_(2)O`C. `CrCl_(3).4H_(2)O`D. All of these
Answer» Correct Answer - A The three `Cl^(-)` ions represent primary valencies and are ionisable.

Discussion

29.	Write the formula of i) tetraamminedichloridochromium (III) Chloride (ii) pentaamminechloridoplatinum (IV) chloride.
Answer» i) `[Cr(NH_(3))_(4)Cl_(2)]Cl` ii) `[Pt(NH_(3))_(5)Cl]Cl_(3)`

Discussion

30.	`PbCl_(2)` is insoluble in cold water. Addition of HCl increases its solubility due toA. formation of soluble complex anions like ``B. oxidation of Pb(II) to Pb(IV)C. formation of ``D. formation of polymeric lead complexes .
Answer» Correct Answer - A Addition of `Cl^(-)` ions to a of suspension `PbCl_2` gives rise to soluble complex ions : `PbCl_2`(s) + `Cl^(-)`(aq) `` `[PbCl_3]^(-)`(aq) `PbCl_2`(s) + `2Cl^(-)`(aq) `` `[PbCl_4]^(2-)`(aq) .

Discussion

31.	Give the shape and behaviour of the following complexes: i) `[Co(NH_(3))_(6)]^(3+)` ii) `[Ni(CN)_(4)]^(2-)`
Answer» i) It is octahedral and diamagnetic. ii) it is square planar and paramagnetic.

Discussion

32.	The correct statement with respect to the complexes `Ni(CO)_(4)` and `[Ni(CN)_(4))^(2-)` is :A. nickel is in same oxidation state in bothB. both have tetrahedral geometryC. both have square planar geometryD. have square planar and tetrahedral geometry respectively
Answer» For more details consult section 9.10

Discussion

33.	The complexes `[Co(NH_(3))_(6)][Cr(CN)_(6)]` and `[Cr(NH_(3))_(6)][Co(CN)_(6)]` are the examples of which type of isomerism ?A. Linkage isomerismB. Ionization isomerismC. Co-ordination isomerismD. Geometrical isomerism .
Answer» Correct Answer - C It is the correct answer.

Discussion

34.	In the formation of complex entity, the central metal atom/ion acts asA. Lewis baseB. Bronsted baseC. Lewis acidD. Bronsted acid.
Answer» Correct Answer - C It is a Lewis acid as it accepts pait of electrons from the ligands thereby forming coordinate bond

Discussion

35.	Which of the following is a negative ligand ?A. thiocarbonylB. carbonylC. cyclopentadienylD. nitrosyl .
Answer» Correct Answer - C Cyclopentadienyl is a negative ligand `(C_(5)H_(5)^(-))` while other ligands are neutral ligands.

Discussion

36.	A solution containing 2.675 g of `CoCl_(3).6NH_(3)` (molar mass = 267.5 g `mol^(-1)` is passed through a cation exchanger. The chloride ions obtained in solution are treated with excess of `AgNO_(3)` to give 4.78 g of AgCl (molar mass = 143.5 g `mol^(-1)` ). The formula of the complex is (At.mass of Ag = 108 u ) .A. `[CoCl(NH_(3))_(5)]Cl_(2)`B. `[Co(NH_(3))_(6)]Cl_(3)`C. `[CoCl_(2)(NH_(3))_(4)Cl`D. `[CoCl_(3)(NH_(3))_(3)]`
Answer» Correct Answer - B No. of moles of `CoCl^(2).6NH_(3)` `= ("Mass of complex") /("Molar mass")` `= (2.675 g) / 267.5 gmol^(-)` = 0.01 mol No. of moles `=("Mass of AgCl")/("Molar mass") = (4.78 g) / (143.5 g mol^(-1))` = 0.033 mol Since 1 mole of the complex `CoCl_(2).6Nh_(3)` gives three molecules of AgCl, this means that the comples has three ionisation Cl atoms. Therefore, its formula as : `[Co(NH)_3(6)]`

Discussion

37.	Which one of the following forms with an excess of `CN^(-)` (Cyanide) a complex having coordination number twoA. `Cu^(2+)`B. `Ag^(+)`C. `Ni^(2+)`D. `Fe^(2+)`
Answer» Correct Answer - B `Ag^(+) + 2CN^(-)ltimplies[Ag(CN)_(2)]^(-)`

Discussion

38.	`d^(2)sp(3)` hybridisation of the atomic orbital gives :A. Square planar complexB. Triangular structureC. Tetrahedral structureD. Octahedral structure.
Answer» Correct Answer - D The structure is octahedral as it has a planar of symmetry.

Discussion

39.	The compound having tetrahedral geometry isA. `[Ni(CN)_(4)]^(2-)`B. `[Pd(CN)_(4)]^(2-)`C. `[PdCl_(4)]^(2-)`D. `[NiCl_(4)]^(2-)`
Answer» Correct Answer - d `[NiCl_4]^(2+)` has tetrahedral geometry .

Discussion

40.	Magnesium is an important component of which biomolecule occuring extensively in living world?A. HaemoglobinB. ChlorophyllC. FlorigenD. ATP
Answer» Correct Answer - B Chlorophyll contains Mg.

Discussion

41.	Please write the name of this the compound and list the rules used for naming the same.
Answer» [Be₄O(CH₃COO^-)₆] Hexa - \(\mu\) - acetato (0, 0') - \(\mu^4\) - OXO - tetra beryllium (11)

41.

Please write the name of this the compound and list the rules used for naming the same.

Answer»

[Be₄O(CH₃COO^-)₆]

Hexa - \(\mu\) - acetato (0, 0') - \(\mu^4\) - OXO - tetra beryllium (11)

Discussion

42.	Which compounds used to estimate the hardness of water volumetrically ?
Answer» EDTA is used for the purpose.

Discussion

43.	Describe a simple test that will allow you to distinguish between the compounds: `[Co(NH_(3))_(5)Br]SO_(4)` and `[Co(NH_(3))_(5)SO_(4)]Br.`
Answer» i) Treat both the isomers separately with aqueous `BaCl_(2)` solution. The isomer which gives a white precipitate is `[Co(NH_(3))_(5)Br]SO_(4)`. ii) Treat both the isomes separately with aqueous `AgNO_(3)` solutions. The isomer which gives a light yellow precipate is `[Co(NH_(3))_(5)SO_(4)]Br`.

Discussion

44.	From the stability constant (hypothetical vlues ) , given below, predict which is the most stable complex ?A. `Cu^(2+)+ 4NH_(3)hArr[Cu(NH_(3))_(4)]^(2+)` `K = 4.5xx10^(11)`B. `Cu^(2+)+4CNhArr[Cu(CN)_(4)]^(2-)` `K = 2.0xx10^(27)`C. `Cu^(2+)+2enhArr[Cu(en)_(2)]^(2+)` `K = 3.0xx10^(15)`D. `Cu^(2+)+4H_(2)OhArr[Cu(H_(2)O)_(4)]^(2+)` `K=9.5xx10^(8)`
Answer» Correct Answer - D A complex having highest value of stability constant in most stable.

Discussion

45.	Hardness of water is estimated by simple tirtration withA. Conductivity methodB. EDTA methodC. Titrimetric methodD. Distillation method.
Answer» Correct Answer - B EDTA method (EDTA forms complexes with `Ca^(2+) and Mg^(2+)` ions present in hard water)

Discussion

46.	Amongst `Ni(CO)_(4),[Ni(CN)_(4)]^(2-)` and `[NiCl_(4)]^(2-)`A. `[Ni(CO)_(4)] and [NiCl_(4)]^(2-)` are diamagnetic and `[Ni(CN)_(4)]^(2-)` is paramagneticB. `[NiCl_(4)]^(2-) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `[Ni(CO)_(4)]` is paramagneticC. `[Ni(CO)_(4)] and [Ni(CN)_(4)]^(2-)` are diamagnetic and `[NiCl_(4)]^(2-)` is paramagneticD. `[Ni(CO)_(4)]` is diamagnetic and `[NiCl_(4)]^(2-) and [Ni(CN)_(4)]^(2-)` are paramagnetic .
Answer» Correct Answer - C `[Ni(CO)_(4)] and [Ni(CN)_(4)]^(2-)` are both diamagnetic with no unpaired electrons `[NiCl_(4)]^(2-)` is paramagnetic with two unpaired electrons.

Discussion

47.	(i) Write the geometrical isomer of the complex `[Co(en)_(2)Cl_(2)]^(+)` . (ii) `[NiCl_(4)]^(2-)` is paramagnetic while `[Ni(CN)_(4)]^(2-)` is diamagnetic through both are tetrahedral . Why ?
Answer» (ii) In `[NiCl_(4)]^(2-)` , the `Cl^(-)` ion being a weak ligand does not cause the pairing of 3d electrons . Therefore , `[NiCl_(4)]^(2-)` is paramagnetic while `[Ni(CN)_(4)]^(2-)` IS DIAMAGNETIC IN NATURE .

Discussion

48.	(a) What type of isomerism is shown by the complex `[Co(NH_(3))_(5)(SCN)]^(2+)`? (b) why is `[NiCl_(4)]^(2-)` paramagnetic while `[Ni(CN)_(4)]^(2-)` is diamagnetic ? (Atomic number of Ni=28) (c) Why are low spin tetrahedral complexes rarely observed?
Answer» (a) It exhibits linkage isomerism . For details, consult section 6 . (b) For answer, consult sectiuon 10 . (c) In tetrahedral complexes , unpaired electrons exits as odd electrons since electrons pairing is distablised. Infact, they have weak splittting since none of the ligands lie within the plane of the orbitals. as a result , tetrahedral complexes generally exist as high spin complexes .

Discussion

49.	Among `\|Ni(CO)_(4)\|, \|Ni(CN)_(4)\|^(2-), \|NiCl_(4)\|^(2-)` species, the hybridisation state at Ni atom are respectively ]Atomic number of Ni = 28]A. `sp^(3),dsp^(3), dsp^(2)`B. `sp^(3), dsp^(2), sp^(3)`C. `sp^(3), sp^(3), dsp^(2)`D. `dsp^(2), dsp^(2), sp^(3)`.
Answer» Correct Answer - B

Discussion

50.	Amongst `[NiCl_(4)]^(2-), [Ni(H_(2)O)_(6)]^(2+), [Ni(PPh_(3))_(2)Cl_(2)], [Ni(CO)_(4)]` and [Ni(CN)^(2-)` the paramagnetic species areA. `[NiCl_(4)]^(2-), [Ni(H_(2)O)_(6)]^(2+), [Ni(PPh_(3))_(2)Cl_(2)]`B. `[Ni(CO)_(4)], [Ni(PPh_(3))_(2)Cl_(2)], [NiCl_(4)]^(2-)`C. `[Ni(CN)_(4)]^(2-), [Ni(H_(2)O)_(6)](2+), [NiCl_(4)]^(2-)`D. `[Ni(PPh_(3))_(2)Cl_(2)], [Ni(CO)_(4)], [Ni(CN)_(4)]^(2-)`
Answer» Correct Answer - A

Discussion

Explore topic-wise InterviewSolutions in .

Give a ligand which is bidentate and given an example of the complex formed by the ligand..

Which of the following represents hexadentate ligand ?A. 2, 2 bipyridylB. DMGC. ethylenediamineD. None of these

Hypo is used in photography because of itsA. a strong oxidising agentB. a strong reducing agentC. a strong complexing agent nD. None of the above.

The oxidation number of Fe in `K_(4)[Fe(CN))(6)]` isA. 3B. 2C. 0D. 1

Which of the following organometallic compound is `sigma` and `pi`-bonded?A. `[Fe(eta^(5)-C_(5)H_(5))_(2)]`B. `[PtCl_(3)(eta^(2)-C_(2)H_(4))]`C. `[Co(CO)_(5)NH_(3)]^(2+)`D. `Al(CH_(3))_(3)`

Chemical formula for in iron(III) hexacyanoferrate(II) isA. `Fe[Fe(CN)_(6)]`B. `Fe_(3)[Fe(CN)_(6)]`C. `Fe_(3)[Fe(CN)_(6)]_(4)`D. `Fe_(4)[Fe(CN)_(6)]_(3)`.

Why is the complex `[CoF_6]^(3-)` less stable than the complex `[Co(en)_3]^(3+)` ?

The oxidation number of `Pt` in `[Pt (C_(2)H_(4))Cl_(3))"]"^(ө)` isA. `+1`B. `+2`C. `+3`D. `+4`

Draw the structure of `[Pt(Cl_(3))(C_(2)H_(4))]`

The correct IUPAC name of `Fe(C_(5)H_(5))_(2)` isA. cyclopentadienyliron(II)B. bis(cyclopentadienyl)iron(II)C. dicyclopentadienylferrate(II)D. ferrocene

IUPAC name of `K_(3)[Fe(CN)_(6)]` isA. potassium hexacyanoferrate (II)B. potassium hexacyanoferrate(III)C. hexacyanoferrate(III)D. potassium ferricyanide

The shape of cuprammonium ion isA. OctahedralB. TetrahdralC. TrigonalD. Square planar

The coordination number of copper in cuprammonium sulphate isA. 2B. 3C. 4D. 6

How many ions per molecule should be produced in the solution when potash alum in dissolved in alrge excess of water ?A. 4B. 8C. 6D. 10

`[Fe(CN)_(6)]^(4-)` and `[Fe(H_(2)O)_(6)]^(2+)` are of different colours in dilute solutions why?

A solution of potassium ferrocyanide would contain â€¦.ionsA. 2B. 3C. 4D. 5

In sodium tetrafluorooxochromate (â€¦.), `Na_(3)[Cr(O)F_(4)]` the left out place should be filled with which of the following Roman unmeral?A. VIB. IIIC. IVD. None of these

Which of the following is organo-metallic compound ?A. `Ti(C_(2)H_(4))_(4)`B. `Ti(OC_(2)H_(5))_(4)`C. `Ti(OCOCH_(3))_(4)`D. `Ti(OC_(6)H_(5))_(4)`

Which of the following metals from polynuclear complex ?A. NaB. MgC. MnD. All

Calculate the overall complex dissociation equilibrium constant for the `[Cu(NH_3)_4]^(2+)` ion, given that `beta_4` for this complex is `2.1xx10^(13)`

When 0.01 mole of a cobalt complex is treated with excess of silver nitrate solution 4.035 g of silver chloride is precipitated. The formula of the complex is :A. `[Co(NH_(3))_(3)Cl_(3)]`B. `[Co(NH_(3))_(5)Cl]Cl_(2)`C. `[Co(NH_(3))_(6)]Cl_(3)`D. `[Co(NH_(3))_(4)Cl_(2)]NO_(3)`

Which complex gives three chloride ions per formula unit ?A. `CrCl_(3).6H_(2)O`B. `CrCl_(3).5H_(2)O`C. `CrCl_(3).4H_(2)O`D. All of these

Write the formula of i) tetraamminedichloridochromium (III) Chloride (ii) pentaamminechloridoplatinum (IV) chloride.

`PbCl_(2)` is insoluble in cold water. Addition of HCl increases its solubility due toA. formation of soluble complex anions like ``B. oxidation of Pb(II) to Pb(IV)C. formation of ``D. formation of polymeric lead complexes .

Give the shape and behaviour of the following complexes: i) `[Co(NH_(3))_(6)]^(3+)` ii) `[Ni(CN)_(4)]^(2-)`

The correct statement with respect to the complexes `Ni(CO)_(4)` and `[Ni(CN)_(4))^(2-)` is :A. nickel is in same oxidation state in bothB. both have tetrahedral geometryC. both have square planar geometryD. have square planar and tetrahedral geometry respectively

The complexes `[Co(NH_(3))_(6)][Cr(CN)_(6)]` and `[Cr(NH_(3))_(6)][Co(CN)_(6)]` are the examples of which type of isomerism ?A. Linkage isomerismB. Ionization isomerismC. Co-ordination isomerismD. Geometrical isomerism .

In the formation of complex entity, the central metal atom/ion acts asA. Lewis baseB. Bronsted baseC. Lewis acidD. Bronsted acid.

Which of the following is a negative ligand ?A. thiocarbonylB. carbonylC. cyclopentadienylD. nitrosyl .

Which one of the following forms with an excess of `CN^(-)` (Cyanide) a complex having coordination number twoA. `Cu^(2+)`B. `Ag^(+)`C. `Ni^(2+)`D. `Fe^(2+)`

`d^(2)sp(3)` hybridisation of the atomic orbital gives :A. Square planar complexB. Triangular structureC. Tetrahedral structureD. Octahedral structure.

The compound having tetrahedral geometry isA. `[Ni(CN)_(4)]^(2-)`B. `[Pd(CN)_(4)]^(2-)`C. `[PdCl_(4)]^(2-)`D. `[NiCl_(4)]^(2-)`

Magnesium is an important component of which biomolecule occuring extensively in living world?A. HaemoglobinB. ChlorophyllC. FlorigenD. ATP

Please write the name of this the compound and list the rules used for naming the same.

Which compounds used to estimate the hardness of water volumetrically ?

Describe a simple test that will allow you to distinguish between the compounds: `[Co(NH_(3))_(5)Br]SO_(4)` and `[Co(NH_(3))_(5)SO_(4)]Br.`

Hardness of water is estimated by simple tirtration withA. Conductivity methodB. EDTA methodC. Titrimetric methodD. Distillation method.

(i) Write the geometrical isomer of the complex `[Co(en)_(2)Cl_(2)]^(+)` . (ii) `[NiCl_(4)]^(2-)` is paramagnetic while `[Ni(CN)_(4)]^(2-)` is diamagnetic through both are tetrahedral . Why ?

(a) What type of isomerism is shown by the complex `[Co(NH_(3))_(5)(SCN)]^(2+)`? (b) why is `[NiCl_(4)]^(2-)` paramagnetic while `[Ni(CN)_(4)]^(2-)` is diamagnetic ? (Atomic number of Ni=28) (c) Why are low spin tetrahedral complexes rarely observed?

Among `|Ni(CO)_(4)|, |Ni(CN)_(4)|^(2-), |NiCl_(4)|^(2-)` species, the hybridisation state at Ni atom are respectively ]Atomic number of Ni = 28]A. `sp^(3),dsp^(3), dsp^(2)`B. `sp^(3), dsp^(2), sp^(3)`C. `sp^(3), sp^(3), dsp^(2)`D. `dsp^(2), dsp^(2), sp^(3)`.