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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.
| 1. |
The secondary valence of `Co^(-3)` is 6. Calculate the number of moles of AgCl precipitated, when excess of `AgNO_(3)` solution is added to 1.5 lit of 0.2 M. `CoCl_(3). 5 NH_(3)` solution |
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Answer» SV of `Co^(+3)` is 6 and it will be satisfied by five `NH_(3)` and one `Cl^(-)` the remaining `2Cl^(-)` ions satisfy IV so formula is `[CoCl(NH_(3))_(5)]Cl_(2)`. 1 mole of this complex of this complex gives 2 mole of `Cl^(-)` ions `1.5xx0.2` mole gives how many moles of `Cl^(-)` ions. `(1.5xx0.2)/(1)xx2 = 0.6`moles. |
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| 2. |
On treatment of 10 ml of 1M solution of the complex `CrCl_(3).6H_(2)O` with excess of `AgNO_(3)`, 4.305 g of AgCl was obtained. The complex isA. `[CrCl_(3)(H_(2)O)_(3)].3H_(2)O`B. `[CrCl_(2)(H_(2)O)_(4)]Cl.2H_(2)O`C. `[CrCl(H_(2)O)_(5)]Cl_(2).H_(2)O`D. `[Cr(H_(2)O)_(6)]Cl_(3)` |
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Answer» Correct Answer - D no. moles of `Cl^(-)` = no. of moles of AgCl `:.` The possible complex is `[Cr(H_(2)O)_(6)]Cl_(3)` |
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| 3. |
The no. of moles of AgCl precipitated when excess of `AgNO_(3)` is mixed with one mole of `[Cr(NH_(3))_(3)Cl_(3)]` isA. `0`B. `1`C. `2`D. `3` |
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Answer» Correct Answer - 1 In `[Cr(NH_(3))_(3)Cl_(3)]`, no primary velencies which are ionisable |
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| 4. |
Which is anionic complex?A. Ferrous ammonium sulphateB. CarnalliteC. Potassium ferrocyaniodeD. Gypsum |
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Answer» Correct Answer - 3 `K_(4)[Fe(CN)_(6)]` |
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| 5. |
The transition metals have a strong tendency to form complaexes because of (i) smaller sizes of the metal ions (ii) variable oxidation states (iii) high ionic charges of metal ions (iv) availability of vacant d-orbitals for bond formation.A. I onlyB. ii onlyC. I & iiD. I,ii,iii |
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Answer» Correct Answer - 4 All are responsible for the complex formation. |
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| 6. |
Which of the following is most likely structrure of `CrCI_(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. `[CrCLl_(3)(H_(2)O)_(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` |
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Answer» Correct Answer - C I.e. The complex consist of one free `Cl^(-)` ion. |
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| 7. |
Coordination number of Cr is six. A complex with ligands `C_(2)O_(4)^(2-)`, en and superoxide will be in the ratio to make complex `[Cr(C_(2)O_(4))_(x)(en)_(y)(O_(2))_(z)]^(Θ)` .A. `1:1:2`B. `1:1:1`C. `1:2:2`D. `2:1:1` |
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Answer» Correct Answer - 1 `C_(2)O_(4)^(-2)` and en are bidentate ligands `O_(2)^(-)` is monodentate ligand. |
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| 8. |
Which of the following statement(s) is (are) correct with reference to the ferrous and ferric ions ?A. `Fe^(3+)` gives brown colour solution with potassium ferricyanide.B. gives blue precipitate with potassium ferricyanide.C. `Fe^(3+)` gives red colour solution with potassium sulphocyanide.D. `Fe^(2+)` gives brown colour solution with potassium sulphocyanide. |
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Answer» Correct Answer - A,B,C A,B,C are correct. D is colourless. |
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| 9. |
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)`A. `4.7xx10^(-14)`B. `2.1xx10^(-13)`C. `2.1xx10^(13)`D. `4.7xx10^(14)` |
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Answer» Correct Answer - 1 The overall dissociation constant to the reciprocal of over all stability constant i.e., `(1)/(beta_(4)) = (1)/(2.1xx10^(13)) = 4.7xx10^(-14)` |
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| 10. |
The hybridization of the d-block element sodium nitropruside is |
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Answer» Correct Answer - 6 `Na_(2)[Fe(CN)_(5)(NO)]` |
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| 11. |
The oxidation state amnd coordination number of the metal in Wilkinson catalyst are +x and y respectively. (x+y) is |
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Answer» Correct Answer - 5 `[RhCl(PPh_(3))_(3)] , 1 + 4 = 5` |
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| 12. |
The coordination number of the metal in the Wilkinson catalyst is `+x`,x is |
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Answer» Correct Answer - 4 `[Ir(Cl)(CO) (PPh_(3))_(2)]` |
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| 13. |
Which of the following statements is/are true?A. In metal carbonyl complexes d increases compared to that in CO moleculeB. The pair of compounds `[Cr(H_(2)O)_(6)]Cl_(3)" and "[CrCl_(3)(H_(2)O)_(3)].3H_(2)O` shows hydration isomerismC. `d_(z^(2))` orbital of central metal atom/ion is used in `dsp^(2)` hybridisationD. Facial and meridional isomers associated with `[Ma_(3)b_(3)]^(npm)` type complex compound, both are optically inactive |
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Answer» Correct Answer - a,d Water of hydration exists in ionic compounds. `.^(d)x^(2)-y^(2)` orbitals is used in `dsp^(2)` hybridization. |
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| 14. |
Gold and platnum dissolves in aquaregia to produce respectivelyA. `H[AuCl_(4)]and H[PtCl_(3)]`B. `H[AuCl_(4)]and H_(2)[PtCl_(6)]`C. `H_(2)[AuCl_(6)]and H[PtCl_(4)]`D. `H_(2)[AuCl_(6)]and H[PtCl_(6)]` |
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Answer» Correct Answer - b `Au^(3+)` C.N.4, `Pt^(4+)` C.N.6 |
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| 15. |
`drarrd` transition is possible inA. `[Cu(NH_(3))_(4)]^(2+)`B. `KMnO_(4)`C. `K_(2)Cr_(2)O_(7)`D. `[Co(NH_(3))_(6)]^(3+)` |
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Answer» Correct Answer - a,d B and D are colored due to charge transfer transition. |
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| 16. |
A complex of platinum, ammonia and chloride produces four ions per molecule in the solution. The structure consistent with the observation is:A. `[Pt(NH_(3))_(4)]Cl_(4)`B. `[Pt(NH_(3))_(2)Cl_(2)]`C. `[Pt(NH_(3))_(5)Cl]Cl_(3)`D. `[Pt(NH_(3))_(4)Cl_(2)]Cl_(2)` |
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Answer» Correct Answer - C `[Pt(NH_(3))Cl]Cl_(3)` gives 4 ions in solution |
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| 17. |
In which of the following ions, the colour is not due to d-d transition?A. `CrO_(4)^(2-)`B. `Cu(NH_(3))_(4)^(2-)`C. `Ti(H_(2)O)_(6)^(3+)`D. `CoF_(6)^(3-)` |
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Answer» Correct Answer - a `CrO_(4)^(2-)`: colour due to charge transfer transition |
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| 18. |
Copper sulphate solution forms blue coloured complex with excess of ammonia. Its formula isA. `[Cu(NH_(3))_(4)]^(+3)`B. `[Cu(NH_(3))_(4)]^(+2)`C. `[Cu(NH_(4))_(3)]^(+2)`D. `[Cu(NH_(4))_(3)]^(+3)` |
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Answer» Correct Answer - 2 `CuSO_(4) + 4NH_(3) to [Cu(NH_(3))_(4)]SO_(4)` |
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| 19. |
Which of the following statements is correct?A. `[CoF_(6)]^(3-)" and "[Co(NH_(3))_(6)]^(3+)` both are paramagnetic complexesB. `[CoF_(6)]^(3-)" and "[Co(NH_(3))_(6)]^(3+)` both are high spin complexC. `[CoF_(6)]^(3-)` is octahedral while `[Co(NH_(3))_(6)]^(3+)` has a pentagonal pyramid shapeD. `[CoF_(6)]^(3-)` is outer orbital complex while `[Co(NH_(3))_(6)]^(3+)` is inner orbital complex |
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Answer» Correct Answer - d `F^(-)` is weak field ligand, `NH_(3)` is strong field ligand. |
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| 20. |
Which of the following complex ion has a magnetic moment same as `[Cr(H_(2)O)_(6)]^(3+)`?A. `[Mn(H_(2)O)_(6)]^(4+)`B. `[Mn(H_(2)O)_(6)]^(3+)`C. `[Fe(H_(2)O)_(6)]^(3+)`D. `[Cu(NH_(3))_(4)]^(2+)` |
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Answer» Correct Answer - a `[Cr(H_2O)_6]^(3+) Cr^(3+)- 4s^0 3d^3` `[Mn(H_2O)_6]^(4+) Mn^(+) - 4s^03d^3` Same no . Of unpaired electrons. |
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| 21. |
in which of the following transition metal complexes does the metal exhibits zero oxidation state.A. `[Co(NH_(3))_(6)]Cl_(3)`B. `[Fe(H_(2)O)_(6)]SO_(4)`C. `[Ni(CO)_(4)]`D. `[Fe(H_(2)O)_(6)]Cl_(3)` |
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Answer» Correct Answer - 3 In metal carbonyl compounds the oxidation number of metal is zero because CO is neutral. |
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| 22. |
Which complex is likely to show optical activity :A. Trans-`[Co(NH_(3))_(4)Cl_(2)]^(+)`B. `[Cr(H_(2)O)_(6)]^(3+)`C. `Cis-[Co(NH_(3))_(2)(en)_(2)]^(3+)`D. Trans-`[Co(NH_(3))_(2)(en)_(2)]^(3+)` |
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Answer» Correct Answer - c `[M(aa)_(2)b_(2)]` Type. Cis isomer occurs in two enantiomeric forms. |
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| 23. |
On the basis of the following observations made with acqueous solutions. In which of the following complexes the central metal atom exhibits secondary valency is six A. `I,ii,iv`B. `ii,iii,iv`C. `ii,iv,v`D. `I,iv,v` |
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Answer» Correct Answer - 2 Free `Cl^(-)` ions gives `AgCl` ppt with `AgNO_(3)` (i) `[Pd(NH_(3))_(4)]Cl_(2)` (ii) `[Ni(H_(2)O)_(6)]Cl_(2)` (iii) `H_(2)[PtCl_(6)]` (iv) `[Co(NH_(3))_(4)Cl_(2)]Cl` |
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| 24. |
Of the following configurations, the optical isomers are A. I and IIB. I and IIIC. II and IVD. II and III |
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Answer» Correct Answer - C II & IV are asymmetrical (chiral) molecule. |
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| 25. |
The complex ion . `[M(en)Br_(2)I_(2)]^(-1)`, has two optical isomers. Their correct configurations are:A. B. C. D. |
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Answer» Correct Answer - D Optical (C) is mirror image and non-super impossible |
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| 26. |
In the complex with formula `MCl_(3).4H_(2)O` the co-ordination number of the metal M is six. And there is a no molecule of hydration in it. The volume of 0.1 M `AgNO_(3)` solution needed to precitate the free chloride ions in 200 ml of 0.01 M solution of the complex isA. 40 mlB. 20 mlC. 60 mlD. 80 ml |
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Answer» Correct Answer - 2 Formula of complex is `[MCl(H_(2)O)_(4)]Cl`. Ionisable `Cl^(-)` atoms are only one. `M_(1)V_(1) =M_(2)V_(2), Vxx0.1 = 200X0.1` |
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| 27. |
The spin only magnetic moment of `[FeBr_(4)]^(-)` is 5.92 BM. Predict the geometry of complex ion. |
| Answer» Secondary valency of `Fe^(+3)` ion is 4. So, complex can be square planar `(dsp^(2))` or tetrahedral `(sp^(3))`. The magnetic moment indicates the presence of five unpaired electrons. Hence complex is tetrahedral (`sp^(3)`- hybridization). | |
| 28. |
Which of the following is cationic complex?A. `K_(4)[Fe(CN)_(6)]`B. `[Ni(CO)_(4)]`C. `[Co(NH_(3))_(3)Cl_(3)]`D. `[Cu(NH_(3))_(4)]SO_(4)` |
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Answer» Correct Answer - 4 `[Cu(NH_(3))_(4)]SO_(4) to [Cu(NH_(3))_(4)]^(+2) + SO_(4)^(-2)` |
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| 29. |
A racemic mixture has a net rotationA. to right of chiralityB. to left of original planeC. to right of original planeD. zero |
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Answer» Correct Answer - 4 Racemic mixture contains equimolar proportions of `d` and `l` forms. So net rotation is zero. |
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| 30. |
Metal-Isothiocyananto is indicated byA. M-SCNB. M-NCSC. M-CNSD. M-CSN |
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Answer» Correct Answer - 2 M - NCS, Isothiocyanate |
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| 31. |
The ionisation isomer of `[Cr(H_(2)O)_(4) Cl (NO_(2))]Cl`A. F T TB. F F TC. T F TD. T T T |
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Answer» (D), `S_(1), S_(2 and S_(3)` are correct statements. `S_(4)` : It is an example of only hydrate isomerism not ionisation isomerism because such isomersim occrus owing to exchange of ions between coordination and ionisation spheres. |
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| 32. |
Which of the following does not have optical isomer?A. `[Co(en)_(3)]Cl_(3)`B. `[Co(NH_(3))_(3)Cl_(3)]`C. `[Co(en)_(2)Cl_(2)]Cl`D. `[Co(en)(NH_(3))_(2)Cl_(2)]Cl` |
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Answer» Correct Answer - 2 It has plane of symmetry. |
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| 33. |
IUPAC name of `Na[CoCl(NO_(2))_(5)]` isA. Sodium chloropentanitrocobaltate (III)B. Sodium cobaltnitrateC. Trisodium chloropentanitro cobaltD. Pentanitrocobalt (III) trisodium complex |
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Answer» Correct Answer - 1 According to IUPAC rules. |
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| 34. |
The IUPAC name of Wilkinsons catalyst `[RhCl(PPh_(3))_(3)]` isA. Chlorotris (triphenylphopshine) rhodium (I)B. Chlorotris (triphenylphosphine) rhodium (IV)C. Chlorotris (triphenylphosphine) rhodium (0)D. Chlorotris (triphenylphosphine) rhodium (VI) |
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Answer» Correct Answer - 1 According to IUPAC rules. |
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| 35. |
`[(Ph_(3)P)_(3)RhCl]` is a familiar catalyst used inA. hydrogenation of oilsB. hydrogenation of alkenesC. dehydration of alcoholsD. dehydration of aldehydes |
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Answer» Correct Answer - 2 Willkinson catalyst |
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| 36. |
ISOMERISM IN COORDINATION COMPOUNDSA. Tetrahedral complexB. Square planar complexC. Linear ComplexD. Planar triangle complexes |
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Answer» Correct Answer - 2 Only in square planar complexes |
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| 37. |
Which one of the following is an example of coordination isomerism?A. `[Co(NH_(3))_(5)Br]SO_(4)` and `[Co(NH_(3))_(5)SO_(4)]Br`B. `[Co(NH_(3))_(5)NO_(2)]Cl_(2)` and `[Co(NH_(3))_(5)ONO]Cl_(2)`C. `[Cr(H_(2)O)_(6)]Cl_(3)` and `[Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O`D. `[Cr(NH_(3))_(6)] [Co(CN)_(6)]` and `[Co(NH_(3))_(6)][Cr(CN)_(6)]` |
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Answer» Correct Answer - D Both cation and anion are co-ordination complexes |
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| 38. |
The two compounds pentaamminesulphatocobalt `(III)`bromide and pentaamminesulphatocobalt `(III)` chloride represent `:`A. Linkage isomerismB. Ionisation isomerismC. coordinatio isomerismD. no isomerism |
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Answer» Correct Answer - D These two are different type of complexes. |
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| 39. |
Hexaaquatitanium (III) chloride isA. `[Ti(H_(2)O)_(6)]Cl_(3)`B. `[TiCl_(3)]6H_(2)O`C. `[Ti(H_(2)O)_(5)Cl]Cl_(2)`D. `[TI(H_(2)O)_(3)Cl_(3)]` |
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Answer» Correct Answer - 1 Hexaaquatitanium (III) chloride is given as `[Ti(H_(2)O)_(6)]Cl_(3)`. |
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| 40. |
The complex formed by the combination of calcium ions and ethylene di ammine tetra acetate. `(EDTA)^(-4)` Number of moles of calcium ions produced by dissolving of one moles of calcium ions produced by dissolving of one mole of that complex in excess of water isA. oneB. twoC. fourD. five |
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Answer» Correct Answer - 2 Formula of the compound is `[Ca(EDTA)]^(2-)` |
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| 41. |
The coordination number of a central metal atom in a complex is determined by:A. the number of ligands around a metal ion bonded by sigma bondsB. the number of ligarnds around a metal ion bonded by `pi`-bondsC. the number of ligands around a metal ion bounded by sigma and pi bonds bothD. the number of only anionic ligands bonded to the metal ion. |
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Answer» Correct Answer - 1 The number of ligands sigma bonded to the metal gives the co-ordination number |
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| 42. |
Among the following which are ambidentate ligands? (a) `NO_(2)^(-)` (b) `NO_(3)^(-)` (c) `EDTA^(+)` (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) |
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Answer» Correct Answer - 4 `-NO_(2)^(-)` and `-SCN` are ambidentate ligands which have two donor atoms. |
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| 43. |
The theoretical percentage wight loss when `[Cr(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O` conc. `H_(2)SO_(4)` in a closed desicator isA. 0.135B. 0.0675C. 0.18D. 0.36 |
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Answer» Correct Answer - a Mol. Wt of `[Cr(H_(2)O)_(4) Cl_(2)]Cl.2H_(2)O` 266.5 g looses `2 xx 18` g of `H_(2)O` 100 g looses `(36 xx 100)/(266.5) = 13.50 %` |
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| 44. |
`AgCl` dissolved in excess of `NH_(3), KCN` and `Na_(2)S_(2)O_(3)` solutions the complex produces ionsA. `[Ag(NH_(3))_(2)]^(+), [Ag(CN)_(2)]^(-) & [Ag(S_(2)O_(3))_(2)]^(3-)`B. `[Ag(NH_(3))_(2)]^(2+), [Ag(CN)_(2)]^(3-) & [Ag_(4)(S_(2)O_(3))_(5)]^(2+)`C. `[Ag(NH_(3))_(2)]^(2+), [Ag(CN)_(2)]^(+) & [Ag_(2)(S_(2)O_(3))_(5)]^(2-)`D. `[Ag(NH_(3))_(4)]^(+), [Ag(CN)_(4)]^(3-) & [Ag_(2)(S_(2)O_(3))_(2)]^(2-)` |
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Answer» Correct Answer - 1 `AgCl + 2NH_(3) to [Ag(NH_(3))_(2)]Cl` `AgCl + 2KCN to K[Ag(CN)_(3)] + KCl` `AgCl + 2Na_(2)S_(2)O_(3) to Na_(3)[Ag(S_(2)O_(3))] + KCl` |
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| 45. |
Bonding in metal carbonyls is represented by the end structures. `overset(M-C-=O" "harr" "M=C=O)(I" "II)` The contribution of I and II to the real structure depends upon the extent of `pi-` back bonding. Both `sigma` donation and `pi-` back bonding are synergitc. The filled orbitals CO overlap with vacant metal d orbitals which is called `sigma` donation. The filled metal d orbitals overlap with `pi` antibondig moleculat orbital of CO. which is called `pi-`back bonding . Which one of the following has the highest C-O bond length?A. `Ti(C_(2)H_(5))_(4)`B. `Ni (CO)_(4)`C. `Cr(CO)_(6)`D. `[Fe(CN)_(6)]^(4-)` |
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Answer» Correct Answer - a Metal - alkyl. No `pi` - back donation . Only `sigma` donor . |
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| 46. |
Bonding in metal carbonyls is represented by the end structures. `overset(M-C-=O" "harr" "M=C=O)(I" "II)` The contribution of I and II to the real structure depends upon the extent of `pi-` back bonding. Both `sigma` donation and `pi-` back bonding are synergitc. The filled orbitals CO overlap with vacant metal d orbitals which is called `sigma` donation. The filled metal d orbitals overlap with `pi` antibondig moleculat orbital of CO. which is called `pi-`back bonding . Which one of the following has the highest C-O bond length?A. `[Cr(CO)_(6)]`B. `[Ti(CO)_(6)]^(2-)`C. `[Mn(CO)_(5)]^(+)`D. `[Fe(CO)_(5)]` |
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Answer» Correct Answer - b More negative charge on Ti atom , which pumps more electrons into `pi^(**)` MO of CO , So bond order decreases , bond length increases. |
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| 47. |
Let `x_(1) lt x_(2) lt x_(3) lt x_(4) lt x_(5)` and `y_(1) lt y_(2) lt y_(3) lt y_(4) lt y_(5)` are in AP such that `underset(I = 1)overset(5)(sum) x_(i) = underset(I = 1)overset(5)(sum) y_(i) = 25` and `underset(I =1)overset(5)(II) x_(i) = underset(I = 1)overset(5)(II) y_(i) = 0` then `|y_(5) - x_(5)|`A. `beta_(n)" "and log" "beta_(n)`B. `K_(n)" "and log" "beta_(n-1)`C. `beta_(n-1)" "and log" "beta_(n-1)`D. `K_(n-1)" "and log" "K_(n-1)` |
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Answer» Correct Answer - a `K_(1)K_(2)K_(3) = beta_(3) , beta_(n) = K_(1)K_(2)………..K_(n)` `"log"beta_(n) = "log" K_(1) + "log"K_(2) + "log"K_(3) + ……… + "log"K_(n)` |
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| 48. |
`(I) K_(3)[Co(CN)_(6)]+[Cr(NH_(3))_(6)]Cl_(3)overset("acetone ")tox+3KCldarr``K_(3)[Cr(CN)_(6)]+[Co(NH_(3))_(6)]Cloverset("Acetone")toy+3KCldarr` the solution was filted x and y are obtained after evoporation of the solvent from the filtrate. when y is sent through anion exchange resn , then the complex eluted isA. `[Co(NH_(3))_(6)]^(3+)`B. `[Cr(NH_(3))_(6)]^(3+)`C. `[Cr(NH_(3))_(6)]^(3-)`D. `[Cr(CN)_(6)]^(3-)` |
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Answer» Correct Answer - a `x: [Cr (NH_(3))_(6)][Co(CN)_(6)] : y [Co(NH_(3))_(6)][Cr(CN)_(6)]` |
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| 49. |
`(I) K_(3)[Co(CN)_(6)]+[Cr(NH_(3))_(6)]Cl_(3)overset("acetone ")tox+3KCldarr``K_(3)[Cr(CN)_(6)]+[Co(NH_(3))_(6)]Cloverset("Acetone")toy+3KCldarr` the solution was filted x and y are obtained after evoporation of the solvent from the filtrate. when x is sent through cation exxhange resin the complex coming out in solution isA. `[Co(NH_(3))_(6)]^(3+)`B. `[Cr(NH_(3))_(6)]^(3+)`C. `[Cr(NH_(3))_(6)]^(3-)`D. `[Cr(CN_(3))_(6)]^(3-)` |
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Answer» Correct Answer - c `x: [Cr (NH_(3))_(6)][Co(CN)_(6)] : y [Co(NH_(3))_(6)][Cr(CN)_(6)]` |
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| 50. |
Which of the following statements is not true about the complex ion `[CrCl_(2)(en)_(2)]^(+)`A. It has two geometrical isomers - cis and stransB. Both the cis and transi isomers display optical activityC. only the cis isomers displays optical activityD. only the cis isomers has non-superimpossible mirror image |
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Answer» Correct Answer - B Trans-isomers has plane of symmetry. |
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