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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Stability of coordination compounds increases with increase in charge density of the metal ions . |
| Answer» Correct Answer - T | |
| 452. |
`Fe(CO)_(5)` has htrigonal bipyramidal geometry . |
| Answer» Correct Answer - T | |
| 453. |
Valence bond theory explains the colour of the coordination compounds . |
| Answer» Correct Answer - F | |
| 454. |
Which of the following is correct ?A. Valence bond theory explains the colour of the coordination compounds .B. `[NiCl_(4)]^(2-)` is diamagnetic in natureC. Ambident ligands can show linkage isomerism .D. A bidentate ligand can have four coordination sites . |
| Answer» Correct Answer - C | |
| 455. |
Spin only magnetic moment of the compound `Hg [C0 (SCN)_(4)]` is |
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Answer» Correct Answer - B |
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| 456. |
The lowest value of paramagnetism is shown byA. `[Co(CN)_(6)]^(3-)`B. `[Fe(CN)_(6)]^(3-)`C. `[Cr(CN)_(6)]^(3-)`D. `[Mn(CN)_(6)]^(3-)` |
| Answer» Correct Answer - A | |
| 457. |
Mark the correct statements regarding the geometry of complex ions . (i) The geometry of the complex ion depends upon the coordination number . (ii) If coordination number is 6 , the complex is octahedral . (iii) If coordination number is 4 , the geometry of the complex may be tetrahedral or square planar .A. (i) , (ii) and (iii)B. (i) and (ii) onlyC. (i) and (iii) onlyD. (ii) and (iii) only . |
| Answer» Correct Answer - A | |
| 458. |
Valence bond theory explains the geometry and magnetic nature of the coordination compounds . |
| Answer» Correct Answer - T | |
| 459. |
Which of the following complex is an outer orbital complex?A. `[Ni(NH_(3))_(6)]^(2+)`B. `[Mn(CN)_(6)]^(4-)`C. `[Co(NH_(3))_(6)]^(3+)`D. `[Fe(CN)_(6)]^(4-)` |
| Answer» Correct Answer - A | |
| 460. |
`[Co(H_(2)O)_(6)]^(3+)` complex isA. a.High spin complexB. b.Having `d^(2)sp^(3)`-hybridizationC. c.Low spin complexD. d.Having octahedral structure . |
| Answer» Correct Answer - B::C::D | |
| 461. |
Structural formula of tetraaquadichloridochromium(III) chlorideA. `[(H_(2)O)_(4)Cl_(2)Cr]Cl`B. `[Cl_(2)(H_(2)O)_(4)Cr]Cl`C. `[Cr(H_(2)O)_(4)Cl_(2)]Cl`D. `[Cr(H_(2)O)_(4)Cl_(3)]` |
| Answer» Correct Answer - C | |
| 462. |
Which of the following is neutral coordination sphere ?A. `K_(4)[Fe(CN)_(6)]`B. `[Co(NH_(3))_(6)]Cl_(3)`C. `[Pt(NH_(3))_(2)Cl_(2)]`D. `[Cu(NH_(3))_(4)]SO_(4)` |
| Answer» Correct Answer - C | |
| 463. |
The total number of electrons on the central atom including those gained by bonding is called the________ abbreviated as_______ . |
| Answer» Correct Answer - Effective atomic number `EAN` | |
| 464. |
The number of ligands attached to the central atom is termed the ___________of the central atom . |
| Answer» Correct Answer - Coordination number | |
| 465. |
Select the true statement from the following for metal carbonyls ?A. `pi` back bonding strengthens M - C bond order as well as CO bond order .B. `pi` back bonding weakens M - C bond order as well as CO bond orderC. `pi` back bonding weakens M - C bond order but strengthens CO bond orderD. `pi` back bonding strengthens M - C bond order and weakens CO bond order . |
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Answer» Correct Answer - D The overlap of a lone pair on the C atom with the empty hybrid metal orbitals forms a metal-to-carbon `pi`-bond . The transition metal atom in a metal carbonyl has filled non-bonding d-orbitals which are of proper symmetry to overlap with the anti-bonding orbitals of CO . The electronic charge is transferred from the filled non-bonding orbitals of the metal to `pi^(**)` orbitals of the ligand CO . This reduces the bond order of CO . The `pi` back-bonding strengthens the M-C bond order , it weakens the C-O bond order . |
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| 466. |
The correct structure of `Fe (CO)_(5)` is ?A. octahedralB. tetrahedralC. square pyramidalD. trigonal bipyramidal . |
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Answer» Correct Answer - D In `Fe(CO)_(5) , Fe` is `sp^(3)` d hybridised and thus trigonal bipyramidal in shape . |
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| 467. |
Which of the following descriptions about `[FeCl_(6)]^(4-)` is correct about the complex ion ?A. `sp^(3) d` , inner orbital complex , diamagneticB. `sp^(3) d^(2)` , outer orbital complex , paramagneticC. `d^(2) sp^(3)` , inner orbital complex , paramagneticD. `d^(2) sp^(3)` , outer orbital complex , diamagnetic . |
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Answer» Correct Answer - B In `[FeCl_(6)]^(4-)` oxidation state of `Fe = + 2 , Fe^(2+) = 3d^(6)` `[FeCl_(6)]^(4-) : Paramagnetic due to presence of four unpaired electrons . |
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| 468. |
How many isomers are possible for complex `[Co(ox)_(2)Cl_(2)]^(+)` ?A. 1B. 3C. 2D. 4 |
| Answer» Correct Answer - B | |
| 469. |
`FeSO_4` solution mixed with `(NH_4)_2SO_4` solution is `1:1` molar ratio gives the test of `Fe^(2+)` ion but `CuSO_4` solution mixed with aqueous ammonia in `1:4` molar ratio does not give the test of `Cu^(2+)` ion. Explain why? |
| Answer» `FeSO_(4)` does not form any complex with `(NH_(4))_(2)SO_(4)` instead , they form a double salt `FeSO_(4)(NH_(4))_(2)sO_(4)6H_(2)O` which dissociates completely into ions but `CuSO_(4)` combines with NH to form the complex `[Cu(NH_(3))_(4)]SO_(4)` in which complex ion , `[Cu(NH_(3))_(4)]^(2+)` does not dissociate to give `Cu^(2+)` ions. | |
| 470. |
`K_(2)SO_(4)` solution mixed with `Cr_(2)(SO_(4))_(3)` solution in 1:1 molar ratio gives the test of `Cr^(3+)` ion but `CuSO_(4)` solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of `Cu^(2+)` ion. Explain why ? |
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Answer» `K_(2)SO_(4).Cr_(2)(SO_(4))_(3) overset(aq)iff2K^(+)(aq)+2Cr^(3+)(aq)+4SO_(4)^(2-)` So chrome alum is double salt. It when dissolved in water gives its constituent ions. Hence it gives the test of `K^(+),Cr^(3+) and SO_(4)^(2-)` ions. `CuSO_(4).4NH_(3)[Cu(NH_(3))_(4)SO_(4) overset(aq)iff[Cu(NH_(3))_(4)]^(2+)(aq)+SO_(4)^(2-)(aq)` As copper (II) is present in coordination sphere it will not given the test of `Cu^(2+)` ion. |
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| 471. |
`[Co(Cr_(2)O_(4))_(3)]^(3-)` is aA. `C_(2)O_(4)^(2-)` is strong field ligand hence causes pairing of electronsB. `C_(2)O_(4)^(2-)` is a bidentate ligand hence causes pairing of electronsC. `Co^(3+)` is a strong central atom hence in all complexes of `Co^(3+)` electrons are pairedD. `C_(2)O_(4)^(2-)` is a strong field ligand hence causes splitting of d-orbitals . |
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Answer» Correct Answer - C `[Co(C_(2)O_(4))_(3)]^(3-) |
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| 472. |
Which of the following pairs of isomers is not correctly matched with its type of isomerism ?A. `[Cr(NH_(3))_(6)][Cr(CN)_(6)]` and `[Cr(NH_(3))_(4) (CN)_(2)][Cr(NH_(3))_(2)(CN)_(4)]`- Coordination isomerismB. `[Co(NH_(3))_(5)NO_(2)]Cl_(2) ` and `[Co(NH_(3))_(5)ONO]Cl_(2)`-Linkage isomerismC. `[Co(py)_(2) (H_(2)O)_(2)Cl_(2)]Cl` and `[Co(py)_(2)(H_(2)O)Cl_(3)]H_(2)O` - Coordination isomerismD. `[Pt(NH_(3))_(4) Br_(2) ] Cl_(2)` and `[Pt(NH_(3))_(4) Cl_2]Br_(2)`- Ionisation isomerism |
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Answer» Correct Answer - C `[Co(py)_(2) (H_(2)O)_(2) Cl_(2)]Cl` and `[Co(py)_(2) (H_(2)O)Cl_(3)]H_(2)O` show hydrate isomerism . |
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| 473. |
Which of the following complex will give white ppt. with `BaCl_(2)` solution ?A. `[Co(NH_(3))_(5) SO_(4)]Br`B. `[Co(NH_(3))_(5)Br]SO_(4)`C. `[Co(NH_(3))_(4) (SO_(4))_(2) ]Br`D. `[Co(NH_(3))_(4) Br(SO_(4))]` |
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Answer» Correct Answer - B `[Co(NH_(3))_(5)Br]SO_(4) hArr [Co(NH_(3))_(5) Br]^(2+) + SO_(4)^(2-) ` `SO_(4)^(2-) + BaCl_(2) to underset("white ppt.")(BaSO_(4)) + 2Cl^(-)` |
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| 474. |
The correct statement with respect to the complexes `Ni(CO)_(4) and |Ni(CN)_(4)|^(2-)` isA. Contains Ni atom in same oxidation state in both the complexesB. Possess square planar geometryC. Possess tetrahedral geometryD. Have square planar and tetrahedral geometry respectively |
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Answer» Correct Answer - D The hybridisation of Ni in `[Ni(CN)_(4)]^(2-)` is `dsp ^(2)` therefore , their shape comes out to be square planar . Whereas , `[Ni(CO)_(4)]` contains `SP_(3)` - hybridised Ni- atom due to which its shape comes out to be tetrahedral . |
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| 475. |
One mole of the complex ` CoCl_(3) . 6 H_(2) O` on reaction with excess of ` AgNO_(3) ` agives two moles of white precipitate thus , complex isA. ` [Co (H_(2) O) _(6) ]Cl_(3) `B. `[Co (H_(2) O)_(5) Cl ]Cl_(2) .H_(2) O `C. `[Co (H_(2) O) _(4)Cl_(2) ]Cl.2H_(2) O`D. `[Co(H_(2)O)_(3) Cl_(3)].3H_(2)O` |
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Answer» Correct Answer - B `CoCl_(3) .6H_(2) O +AgNO_(3)to 2"mole of " AgCl` thus two Cl-atoms are outside the coordination sphere `C.N " of" Co=6` thus , `[Co(H_(2)O)_(5)Cl]Cl_(2).H_(2)O.` |
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| 476. |
What is true about ` [Mn Cl_(6) ]^(3-) , [FeF_(6)]^(3-) and [CoF_(6)]^(3-)`? each of these are outer orbital complexes . II. Each of these have ` SP^(3) d^(2)` hybridisation . III . Each of these are paramagnetic . IV . `[MnCl_(6) ]^(3-),[FeF_(6)]^(3-)and [CoF_(6)]^(3-)` have four ,five and four unpaired electrons respectively . Choose the correct statements .A. I,II and IIIB. II,III and IVC. I,III and IVD. I,II ,III and IV |
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Answer» Correct Answer - D All the given statements are true . |
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| 477. |
The complex that shows optical acitivity isA. `trans-[CoCl_(2)(en)_(2)]^(+)`B. `cis-[CoSl_(2)(en)_(2)]^(+)`C. `trans-[PtCl_(2)(NH_(3))_(2)]`D. `[CoCl_(2)(NH_(3))_(2)(en)]^(+)` |
| Answer» Correct Answer - B | |
| 478. |
For `[FeF_(6)]^(3-) and [CoF_(6)]^(3-)`, the statement that is correct is :A. both are colouredB. both are colourlessC. `[FeF_(6)]^(3-)` is colored and `[CoF_(6)]^(3-)` is colorlessD. `[FeF_(6)]^(3-)` is colorless and `[CoF_(6)]^(3-)` is colored |
| Answer» Correct Answer - D | |
| 479. |
Which of the following ligands are correctly represented in an spectrochemical series ? .A. a.`SCN^(Θ), F^(Θ),CN^(Θ) `B. b.`SCN^(Θ),CN^(Θ),F^(Θ)`C. c.`F^(Θ),SCN^(Θ),CN^(Θ)`D. d.`F^(Θ),CN^(Θ),SCN^(Θ)` |
| Answer» Correct Answer - A | |
| 480. |
Which of the following statementss about ammonium cerium (IV) nitrate, `(NH_(4))_(2)[Ce(NO_(3))_(6)]` is false ?A. `NO_(3)^(-)` acts as a monodentate ligandB. The Ce atom has as coordination number of 12C. The shape of the complex ion is icosahedronD. The solution is used as oxidizing agent. |
| Answer» Correct Answer - A | |
| 481. |
The increasing order of the crystal field splitting power of some common ligands isA. `NH_(3) lt Cl^(-) lt CN^(-) lt F^(-) lt CO lt H_(2)O`B. `F^(-) lt Cl^(-) lt NH_(3) lt CN^(-) lt H_(2)O lt CO`C. `Cl^(-) lt F^(-) lt H_(2)O lt NH_(3) lt CN^(-) lt CO`D. `CO lt CN^(-) lt NH_(3) lt H_(2)O lt F^(-) lt Cl^(-)` |
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Answer» Correct Answer - C In general , the ligands can be arranged in a series in the order of increasing field strength as `I^(-) lt Br^(-) lt SCN^(-) lt Cl^(-) lt S^(2-) lt F^(-) lt OH^(-) lt C_(2)O_(4)^(2-) lt H_(2)O lt NCS^(-) lt EDTA^(4-) lt NH_(3) lt en lt NO_(2)^(-) lt CN^(-) lt CO` |
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| 482. |
The increasing of the crystal field splitting power of some common ligands is ? .A. `NH_(3)ltNO_(2)^(Θ)ltCN^(Θ)ltH_(2)O`B. `H_(2)OltNO_(2)^(Θ)ltCN^(Θ)ltNH_(3)`C. `H_(2)OltNH_(3)ltNO_(2)^(Θ)ltCN^(Θ)`D. `H_(2)OltNH_(3)ltCN^(Θ)ltNO_(2)^(Θ)` |
| Answer» Correct Answer - C | |
| 483. |
Which one of the following reactions is correct ?A. `[Fe(CO)_(5)]+2NO to [Fe(CO)_(2)(NO)_(2)]+3CO`B. `[Fe(CO)_(5)]+2NO to [Fe(CO)_(2)(NO)_(2)]+2CO`C. `[Fe(CO)_(5)]+3NO to [Fe(CO)_(2)(NO)_(2)]+3CO`D. `[Fe(CO)_(5)]+3NO to [Fe(CO)_(2)(NO)_(2)]+2CO` |
| Answer» Correct Answer - A | |
| 484. |
In which of the following complexes the metal ion has the lowest ionic radius ?A. `[Ti(H_(2)O)_(6)]^(2+)`B. `[V(H_(2)O)_(6)]^(2+)`C. `[Cr(H_(2)O)_(6)]^(2+)`D. `[Mn(H_(2)O)_(6)]^(2+)` |
| Answer» Correct Answer - B | |
| 485. |
IUPAC name of complex ion `[CrCl_(2)(ox)_(2)]^(3-)` isA. dichlorodioxalatochromium(III)B. dioxalatodichlorochromate(III)C. dichorodioxalatochromate(III)D. bisoxalaeodichlorochromate (III) |
| Answer» Correct Answer - C | |
| 486. |
Which of the given metal ion form high tendency to complex with CO ?A. `Sc^(+3)`B. `Ti^(+3)`C. `Mn^(+2)`D. `Fe^(+2)` |
| Answer» Correct Answer - D | |
| 487. |
Which of the following compounds has the least tendency to form hydrogen bonds between molecules ?A. `NH_(3)`B. `H_(2)NOH`C. `HF`D. `CH_(3)F` |
| Answer» Correct Answer - D | |
| 488. |
The bond order for a species with the configuration `sigma1s^(2)sigma^(***)1s^(2)sigma2s^(2)sigma^(**)2s^(2)sigmapx^(1)` will beA. 1B. `1//2`C. zeroD. `3//2` |
| Answer» Correct Answer - B | |
| 489. |
Which of the following molecules`(s)is//are` not showing optical isomerism ? .A. `a.[Co(NH_(3))_(3)Br_(3)]`B. `b.[Co(en)Br_(2)(NH_(3))_(2)]^(o+)`C. `c.[Co(en)_(3)]^(3+)`D. `d.[Co(en)_(2)Br_(2)]^(o+)` |
| Answer» Correct Answer - B::C::D | |
| 490. |
Which of the following complex`(s)`is//are an example of homolepic complex .A. `a)[Co(NH_(3))_(6)]^(3+)`B. `b)[Cr(H_(2)O)_(6)]^(3+)`C. `c)[Ni(NH_(3))_(6)]^(2+)`D. `d)[Ni(NH_(3))_(4)CI_(2)]` |
| Answer» Correct Answer - A::B::C | |
| 491. |
Which of the following represent the correct sequence of indicated property ? .A. `a.Mn^(2+)ltNi^(2+)ltCo^(2+)ltFe^(2+)`: magnetic momentB. `b.FeOgtCoOgtNiO`:basic characterC. `c.ScltTiltCrltMn`: number of oxidation statesD. `d.1.73mu:` one unpaired electrons |
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Answer» Correct Answer - B::C::D The number of unpired electrons of the ions in the give choices are `Mn^(2+) (n=5),Ni^(2+) (n=2),Co^(2+) (n=3)` and `Fe^(2+)(n =4)` . |
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| 492. |
Which of the pair of complex compounds are tettrahedral as well as diamagnetic ? .A. a.`[CoCl_(4)]^(Θ)` and `[Co(CO)_(4)]^(Θ)`B. b.`[Ag(SCN)_(4)]^(2-)` and `[NiCl_(4)]^(2-)`C. c.`[Co(CO)_(4)]^(Θ)` and `[Ni(CN)_(4)]^(4-)`D. d.`[PdCl_(4)]^(2-)` and `[Ni(CN)_(4)]^(2-)` |
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Answer» Correct Answer - C Refer to Solution of `Q.14 part d (Multiple Correct Answer Type). |
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| 493. |
What is the co-ordination number of `Cr` in `K_3[Cr(Ox)_3]`A. (a) `6`B. (b) `4`C. (c) `3`D. (d) `2` |
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Answer» Correct Answer - A `Ox` is bidentate ligand. |
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| 494. |
In the complex ions , `[Fe(C_(2)O_(4))_(3)]^(3+)` the coordination number of Fe and Co is 6 becauseA. `C_(2)O_(4)^(2-)` and ethane -1,2 dimaine are didentable ligandsB. `C_(2) O_(4) ^(2-) ` and ethane -1,2,- dimamine are ambidentate ligandsC. `C_(2) O_(4)^(2-)` and ethane -1,2 - dimamine are polydentate ligandsD. None of the these |
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Answer» Correct Answer - A In the complex ion , `[Fe (C_(2) O_(4))_(3)]^(3-) and Co (en) _(3)]^(3+)` , the coordination number of Fe and Co is because ` C_(2) O_(4)^(2-)` and ethane `-1,2-` diamine are didentate ligands . |
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| 495. |
Among the properties `(A)` reducing`(B)` oxidising `(C )` complexing the set of properties shown by `CN^(Θ)`ion towards metal species is .A. `B,C`B. `A,B,C`C. `C,A`D. `A,B` |
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Answer» Correct Answer - C `CN^(Θ)` acts a ligands and reducing agent . |
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| 496. |
How many mloes of of `AgCI` would be obtained when `100mL` of `0.1 M Co(NH_(3))_(5)CI_(3)` is treated with excess of `AgNO_(3)` ? (a) 0.01 (b) `0.02` (c ) `0.03` (d )None of these . |
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Answer» Correct Answer - b `CN` of `Co^(3+) =6` . So, formula of complex and reaction are as follows `{:([Co(NH_(3))_(5)CI]CI_(2)+2underset(darr)AgNO_(3),,,,),(2AgCI+[Co(NH_(3))_(5)CI](NO_(3))_(2),,,,):}` m moles of complex `= 100mL xx 0.1 M = 10 m` moles. :. 1 m mole of complex `implies2` m moles of `AgCI` :.10m mole of complex `implies` 20m moles of `AgCI` `implies 20 xx 10^(-3) = 0.02` moles . |
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| 497. |
Which of the following has longest `C-O` bond length? (Free `C-O` bond length in CO is `1.128Å`).A. `[Mn(CO)_(6)]^(+)`B. `Ni(CO)_(4)`C. `[Co(CO)_(4)]^(-)`D. `[Fe(CO)_(4)]^(2-)` |
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Answer» Correct Answer - D Due to back bonding (i.e. the flow of electrons from the metal to carbon of CO) the bond length in CO molecule decreases. Thus, greater the back bonding, the shorter the `C-O` bond length. In carbonyl (4), the central metal atom exhibits maximum back bonding due to maximum electron density on account of maximum -ve charge. |
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| 498. |
An excess of `AgNO_(3)` is added to `100mL` of a `0.01M` solution of dichlorotetraaquachromium(III) chloride The number of moles of `AgCI` precipitated would be .A. `0.002`B. `0.003`C. `0.01`D. `0.001` |
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Answer» Correct Answer - D `[Cr(H_(2)O)_(4)C1_(2)]C1 implies 1` mol AgC1 1 mol no of mooles = (Molarity)(Vol. of soln. in litres) `= (0.01 M) (0.1 L)` `= 0.001` Thus, `0.001` mol of complex will yield `0.001` mol of AgC1 |
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| 499. |
Jahn - Teller effect is not observed in high spin complexes ofA. `d^(7)`B. `d^(8)`C. `d^(4)`D. 2-)` |
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Answer» Correct Answer - B Jahn-Teller effect is tetragonal distortion of octahedral complexes which arises whenever the `e_(g)` orbitals `(d_(x^(2)-y^(2))` and `d_(z^(2))` orbitals) are unequally occupied (an asymmetrical arrangement of d electrons). Thus Jahn - Teller effect is observed in `d^(4)` (high - spin complexes), `d^(7)` (low-spin complex) and `d^(9)` (strong or weak field complex). Jahn-Teller effect is not observed in `d^(8)` (strong or weak field complex) as it has symmetrical electronic arrangement: `t_(2g)^(6)e_(g)^(2)` . |
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| 500. |
Most of the metal carbonyls obey inert gas rule which states the the compounds in which the central metal atom appears to have attained the configuration of a noble gas either by the sharing or by the transfer of electrons tend to be more stable Which of the following has highest `C-O` bond length ? (a) `[mn(CO)_(6)]^(o+)` (b) `[Co(CO)_(4)]^(Θ)` (c) `[Fe(CO)_(4))]^(2-)` (d) `[Ni(CO)_(4)]` . |
| Answer» Correct Answer - C | |