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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.
| 51. |
When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous `NaCl` to the blue solution gives a white precipitate O. Addition of aqueous `NH_(3)` dissolves O and gives an intense blue solution. The compound N isA. `AgNO_(3)`B. `Zn(NO_(3))_(2)`C. `Al(NO_(3))_(3)`D. `Pb(NO_(3))_(2)` |
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Answer» Correct Answer - A `Cu(M) +AgNO_(3) ( "aqueous colorless solution ") rarr "Resultant solution " underset((N)(blue solution)")((Cu(NO_(3))_(2)+AgNO_(3)))` Note `:` Here it is considered that complete `AgNO_(3)` is not utilized in the reaction `AgNO_(3)+NaClrarrunderset((O)(whiter ppt.)")(AgCldarr+NaNO_(3))` Solution containing white ppt. of AgCl also contains `Cu(NO_(3))_(2)` which developed deep blue colouration with aqueous `NH_(3)` solution . `AgCldarr ("white")+2NH_(3)(aq). rarr [Ag(NH_(3))_(2)]^(+)` `Cu(NO_(3))_(2)(aq.)+4NH_(3)(aq.) rarr underset("(deep blue coloration)")([Cu(NH_(3))_(4)](NO_(3))_(2)` So, Metal rod M is Cu. The compound N is `AgNO_(3)` and the final solution contains `[Ag(NH_(3))_(2)]^(+)` and `[Cu(NH_(3))_(4)]^(2+)` |
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| 52. |
Normally `FeCl_(3).6H_(2)O` consists ofA. trans `[Fe(H_(2)O)_(2)Cl_(2)]Cl.4H_(2)O`B. trans`[Fe(H_(2)O)_(6)Cl]Cl_(2)`C. trans `[Fe(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O`D. trans`[Fe(H_(2)O)_(3)Cl_(3)]Cl.3H_(2)O` |
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Answer» Correct Answer - C It consists of trans `[Fe(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O` |
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| 53. |
Which of the following compounds is colourlessA. `Cu_(2)(CH_(3)COO)_(4).2H_(2)O`B. `Cu_(2)Cl_(2)`C. `CuSO_(4).5H_(2)O`D. `[Cu(NH_(3))_(4)]SO_(4).4H_(2)O` |
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Answer» Correct Answer - B The anhydrous complex of `Cu^(+)` do not involvee d-d transition and are thus colourless. |
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| 54. |
Which of the following exhibits highest molar conductivityA. `[Co(NH_(3))_(6)]Cl_(3)`B. `[Co(NH_(3))_(5)Cl]Cl_(2)`C. `[Co(NH_(3))_(4)Cl_(2)]Cl`D. `[Co(NH_(3))_(3)Cl_(3)]` |
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Answer» Correct Answer - A On ionisation it gives maximum number of ( four ) ions. |
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| 55. |
The oxidation number of Fe in `K_(4)[Fe(CN))(6)]` isA. `+2`B. `-2`C. `+3`D. `+4` |
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Answer» Correct Answer - A `4 xx (+1) +x+6xx-1=0` or `x= +6-4= +2` Oxidation state of `F e= +2`. |
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| 56. |
The IUPAC name of compound `Na_3[Co(ONO)_6]` will beA. Hexanitritocobalt (III) sodiumB. Sodium cobalt nitriteC. Sodium hexanitrocobaltate(III)D. Sodium hexanitritocobaltate (III) |
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Answer» Correct Answer - D Follow IUPAC rule |
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| 57. |
Which of these statements about `[Co(CN)_6]^(3-)` is true?A. `[Co(CN)_(6)]^(3-)` has four unpaired electrons and will be in a low-spin configurationB. `[Co(CN)_(6)]^(3-)` has four unpaired electrons and will be in a high-spin configurationC. `[Co(CN)_(6)]^(3-)` has no unpaired electrons and will be in a high - spin configurationD. `[Co(CN)_(6)]^(3-)` has no unpaired electron and will be in a low-spin configuration |
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Answer» Correct Answer - D `[Co(CN)_(6)]^(-3)` O.N. of Co`=+3` `Co^(+3) = 4s^(0) 3d^(6)`, `CN^(-)` is strong field ligand so hybridisation is `d^(2)sp^(3)` and has no unpaired electrons. |
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| 58. |
The name of complex ion, `[Fe(CN_(6))]^(3-)` isA. Ferroso-ferric cyanideB. Ferric -ferrous hexacyanateC. Iron (III) hexacyanoferrate (II)D. Hexacyanoferrate (III-II) |
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Answer» Correct Answer - C Follow IUPAC rule |
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| 59. |
Which of the following has highest molar conductivityA. Diamminedichloroplatinum (II)B. Tetraaminedichlorocobalt (III) chlorideC. Potassium hexacyanoferrate (II)D. Hexaaquochromium (III) bromide |
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Answer» Correct Answer - C As the number of ionsif complex compounds when dissolved in water increases, molar conductivity also increases. 1 mole of `[Pt(NH_(3))_(2)Cl_(2)]` gives one mole of ions. 1 mole of `[Co(NH_(3))_(4)Cl_(2)]Cl` gives two mole of ions 1 mole of `K_(4)[Fe(CN)_(6)]` gives five moles of ions 1mole of `[Fe(CO)_(5)]` gives zero moles of ions `[` because it is a neutral molecule ] Hence, `K_(4)[Fe(CN)_(6)]` has the highest molar conductivity |
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| 60. |
The IUPAC name of `K_(4)[Ni(CN)_(4)]` isA. Tetrapotassium tetracyano nickelate (II)B. Potassium tetracyano nickel (II)C. Potassium tetracyano nickelate ( 0)D. Potassium tetracyano nickelate (II) |
| Answer» Correct Answer - C | |
| 61. |
According to IUPAC nomenclature sodium nitroprusside is named asA. Sodium pentacyanonitrosyl ferrate (III)B. Sodium nitro ferricyanideC. Sodium nitroferrocyanideD. Sodium pentacyanonitrosyl ferrate (II) |
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Answer» Correct Answer - A Follow IUPAC rule. |
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| 62. |
`NH_(3)` group in a coordination compound is named as __________.A. AmmoniumB. AmmineC. AmineD. Ammonia |
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Answer» Correct Answer - B `NH_(3)` ( Ammine) is a neutral ligand with zero charge and named " ammine". |
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| 63. |
The number of moles of ions given on complete ionisation of one mole of `[Co(NH_(3))_(3)Cl_(3)]` isA. 4B. 3C. 2D. 1 |
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Answer» Correct Answer - D As no ions is present outside the co-ordination sphere of `[Co(NH_(3))_(3)Cl_(3)]` , therefore on ionisation it will give only one mole of ion |
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| 64. |
`CH_3MgI` is an organometallic compound due toA. `Mg-I` bondB. `C-I` bondC. `C-Mg` bondD. `C-H` bond |
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Answer» Correct Answer - C Due to `C-Mg` bond. |
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| 65. |
Which of the following statements is incorrectA. In `K_(3)[Fe(CN)_(6)]`, the ligand has satisfied only the secondary valencies of ferric ionB. In `K_(3)[Fe(CN)_(6)]`, the ligand has satisfied both primary and secondary valencies of ferric ionC. In `K_(4)[Fe(CN)_(6)]`, the ligand has satisfied both primary and secondary valencies of ferrous ionD. In `[Cu(NH_(3))_(4)]SO_(4)` , the ligand has satisfied only the secondary valencies of copper |
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Answer» Correct Answer - A::D In `K_(3)[Fe(CN)_(6)]` the ligand are negative which is present in coordination spheres shows a dual behaviour. It may satisfy both primary & secondary valencies while neutral ligand satisfies only secondary valencies. |
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| 66. |
The magnetic moment of a transition metal is ` sqrt(15)` B.M . Find out the number of unpaired electrons in it .A. 4B. 1C. 2D. 3 |
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Answer» Correct Answer - D Magnetic moment `= sqrt(n(n+2))` where, `n=` no. of unpaired electrons. given, `mu= sqrt(15) :. sqrt(15) = sqrt(n(n+2))implies 15= n(n+2)` This is possible only when `n=3` |
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| 67. |
Which of the following can participate in linkage isomerismA. `NO_(2)^(-)`B. `H_(2) overset(..)(N) CH_(2)CH_(2)overset(..)(N) H_(2)`C. `H_(2)O`D. `: NH_(3)` |
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Answer» Correct Answer - A `NO_(2)^(-)` may be bonded to metal through nitrogen ( nitro) or through oxygen (nitrito). Hence `NO_(2)^(-)` can participate in linkage isomerism. `underset("pentaammino enitro cobalt (III) cobalt")([(NH_(3))_(5)CoNO_(2)]Cl_(2))` and `underset("Pentaammin enitrito cobalt (III) cobalt")([(NH_(3))_(5)CoONO]Cl_(2))` |
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| 68. |
Which of the following complexes shows six coordination number?A. `[Zn(CN)_(4)]^(2-)`B. `[Cr(H_(2)O)_(6)]^(3+)`C. `[Cu(CN)_(4)]^(2-)`D. `[Ni(NH_(3))_(4)]^(2+)` |
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Answer» Correct Answer - B Co-ordination number is equal to total number of ligands in a complex. |
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| 69. |
The aqueous solution of the following salts will be coloured in the case ofA. `Zn(NO_(3))_(2)`B. `LiNO_(3)`C. `Co(NO_(3))_(2)`D. `CrCl_(3)` |
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Answer» Correct Answer - CD Aueous solution of `Co(NO_(3))_(2)` and `CrCl_(3)` is which `Co^(2+)(d^(7))` and `Cr^(3+)(d^(3))` contains incompletely filled d-orbitals is coloured. |
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| 70. |
In which compound synergic effect is present ?A. `[Ni(CO)_(4)]`B. `[NiCl_(4)]^(2-)`C. `[Cu(Cl_(4)]^(2-)`D. `[Mn(H_(2)O)_(6)]^(2+)` |
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Answer» Correct Answer - A In `pi` acid ligand back bonding also take place which in value filled orbitals of metal and vacant orbitals of ligand this is synergic effect. |
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| 71. |
Potassium manganate `(K_2MnO_4)` is formed whenA. Chloride is passes into aqueous `KMnO_(4)` solutionB. Manganese dioxide is fused with potassium hydroxide in airC. Formaldehyde reacts with potassium permanganate in presence of a strong alkaliD. Potassium permanganate reacts with conc. Sulphuric acid |
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Answer» Correct Answer - B::C `2MnO_(2)+4KOH +O_(2) overset("heat")(rarr) 2K_(2)MnO_(4)+2H_(2)O` |
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| 72. |
Correct formula of potassium ferrocyanide isA. `K_(4)[Fe(CN)_(6)]`B. `K_(2)[Fe(CN)_(6)]H_(2)O`C. `K_(3)[Fe(CN)_(6)]`D. None of these |
| Answer» Correct Answer - A | |
| 73. |
The coordination number of a metal in coordination compound isA. Same as primary valencyB. Sum of primary and secondary valenciesC. Same as secondary valencyD. None of these |
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Answer» Correct Answer - C According to modern view primary valency of complex compound is its oxidation number while secondary valency is the co-ordination number. |
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| 74. |
In the process of extraction of gold. Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2))rarr [X]+OH^(-)` `[X]+Znrarr [Y]+Au` Identify the complexes `[X] ` and `[Y]`.A. `X= [Au(CN)_(2)]^(-),Y=[Zn(CN)_(4)]^(2-)`B. `X= [Au(CN)_(2)]^(3-),Y=[Zn(CN)_(4)]^(2-)`C. `X= [Au(CN)_(2)]^(2-),Y=[Zn(CN)_(6)]^(4-)`D. `X= [Au(CN)_(4)]^(-),Y=[Zn(CN)_(4)]^(2-)` |
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Answer» Correct Answer - A `2Au+4CN^(-) + H_(2)O+(1)/(2)O_(2) rarr 2[Au(CN)_(2)]^(-)+2OH^(-)` `2[Au(CN)_(2)]^(-)+Zn rarr [Zn(CN)_(4)]^(2-)+2Au` |
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| 75. |
The number of ions per mole of a complex `[CoCl(NH_(3))_(5)]Cl_(2)` in aqueous solution will beA. NineB. FourC. ThreeD. Two |
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Answer» Correct Answer - C It will ionize in the following manner. `[Co(NH_(3))_(5)]Cl_(2) hArr [Co(NH_(3))_(5)]^(2+)+2Cl^(-) ` ( 3 ions). |
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| 76. |
When `MnO_(2)` is fused with `KOH,` a coloured compound is formed, the product and its colour is:A. `K_(2)MnO_(4)`, Purple greenB. `KMnO_(4), `PurpleC. `Mn+(2)O_(3)`, BrownD. `Mn_(3)O_(4)` Black |
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Answer» Correct Answer - A Stable oxidation state of Mn in alkaline medium is `+6` . So, `MnO_(2)` is oxidised to `K_(2)MnO_(4)`(purple green) by atmospheric oxygen in KOH medium. `2MnO_(2) 4KOH+O_(2) rarr 2K_(2)MnO_(4)+2H_(2)O` |
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| 77. |
The complex `[Pt(NH_(3))_(6)]Cl_(4)` furnishes ________ ions in aqueous solution.A. 5 ionsB. 4 ionsC. 3 ionsD. 2 ions |
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Answer» Correct Answer - A `[Pt.(NH_(3))_(6)]Cl_(4) hArr [Pt.(NH_(3))_(6)]^(4+)+4Cl^(-)(5ions)`. |
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| 78. |
In the complex acetylbromidodicarbonylbis (triethylphosphine) iron (II), the number of `Fe-C` bond (s) is |
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Answer» Correct Answer - 3 `[Fe(CH_(3)O)Br(CO)_(2){P(C_(2)H_(5))_(3)}_(2)]` `CH_(3) - underset(O)underset(||)overset(c-)C"Ligand"rarr` One Fe-C bond Co Ligand ` rarr` two Fe-C bond |
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| 79. |
Which of the following complex will give white ppt. with `BaCl_(2)` solution ?A. `[Co(NH_(3))_(4)SO_(4)]NO_(2)`B. `[Cr(NH_(3))_(5)SO_(4)]Cl`C. `[Cr(NH_(3))_(5)Cl]SO_(4)`D. Both (b) and (c ) |
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Answer» Correct Answer - C `[Cr(NH_(3))_(5)Cl]SO_(4) rarr [Cr(NH_(3))_(5)Cl]^(2+)+SO_(4)^(2-)` `[Cr(NH_(3))_(5)Cl]^(2+)+SO_(4)^(2-)+BaCl_(2) rarr [Cr(NH_(3))_(5)Cl]Cl_(2)+BaSO_(4)+HCl` |
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| 80. |
One mole of complex compound `Co(NH_3)_5Cl_3` gives 3 moles of ions on dissolution in water. One mole of same complex reacts with two moles of `AgNO_3` to yield two moles of `AgCl(s)`. The complex is:A. `[Co(NH_(3))_(5)Cl]Cl_(2)`B. `[Co(NH_(3))_(3)Cl_(3)]. 2NH_(3)`C. `[Co(NH_(3))_(4)Cl_(2)]Cl. NH_(3)`D. `[Co(NH_(3))_(4)Cl]Cl_(2).NH_(3)` |
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Answer» Correct Answer - A `2Cl^(-)` ions are ionizable `:. [Co(NH_(3))_(5)Cl]Cl_(2) hArr ubrace([Co(NH_(3))_(5)Cl]^(2+)+2Cl^(-))_("3 "ions"")` `2Cl^(-) +2AgNO_(3)rarr 2AgCl+2NO_(3)^(-)` |
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| 81. |
Which one of the following complexes is paramagneticA. `[CoF_(6)]^(3+)`B. `[Co(H_(2)O)_(6)]^(3+)`C. `[CoF_(3)(H_(2)O)_(3)]`D. All of these |
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Answer» Correct Answer - D As all the ligands are weak so they do not induce pairing of electrons so they show paramagnetism. |
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| 82. |
Which of the following molecules is not tetrahedral ?A. `[Pt(en)_(2)]^(2+)`B. `[Ni(CO)_(4)]`C. `[Zn(NH_(3))_(4)]^(2+)`D. `[NiCl_(4)]^(2-)` |
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Answer» Correct Answer - A `[Pt(en)_(2)]^(2+)` Square planar. |
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| 83. |
Which of the following shell from an octahedral complexA. `d^(4) (` low spin)B. `d^(8)` ( high spin)C. `d^(6)` ( low spin)D. None of these |
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Answer» Correct Answer - C The compounds which show `d^(6)` -configuration are octahedral complexes. |
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| 84. |
Low spin complex of `d^6`-cation in an octahedral field will have the following energy:A. `(-12)/(5) Delta _(0) +P`B. `(-12)/(5) Delta _(0) +3P`C. `(-2)/(5) Delta _(0) +2P`D. `(-2)/(5) Delta _(0) +P` |
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Answer» Correct Answer - B `d^(6)-t_(2g)^(2,2,2)eg^(0,0)` ( In low spin) C.F.S.E `= -0.4 xx 6 Delta _(0) + 3P` `= - (12)/(5) Delta _(0) +3P` |
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| 85. |
Oxidation state of nitrogen is incorrectly given forA. `{:("Compound","Oxidation state"),([Co(NH_(3))_(5)Cl]Cl_(2),0):}`B. `{:("Compound","Oxidation state"),(NH_(2)OH,-1):}`C. `{:("Compound","Oxidation state"),((N_(2)H_(5))_(2)SO_(4),+2):}`D. `{:("Compound","Oxidation state"),(Mg_(3)N_(2),-3):}` |
| Answer» Correct Answer - C | |
| 86. |
Which of the following is formed when n-butyl lithium reacts with tin (II) chloride?A. LiBrB. `E t_(4)Pb`C. `(C_(4)H_(9))_(4)Sn`D. `(C_(2)H_(5))_(4)Pb` |
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Answer» Correct Answer - C `4CH_(3)CH_(2)CH_(2)CH_(2)-Li+SnCl_(2)rarr (C_(4)H_(9))_(4)Sn`. |
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| 87. |
Pick the correct name of `[Co(NH_(3))_(5)Cl]Cl_(2)`A. Chloropentammine cobalt (III)B. Pentammine cobalt (III) chlorideC. Chloropentammine cobalt (III) chlorideD. Chloropentammine cobalt (II) chloride |
| Answer» Correct Answer - C | |
| 88. |
Dichloro diammine platinum (II) complex has the formulaA. `Pt[Cl_(2)(NH_(3))_(2)]`B. `[Pt[R.(NH_(3))_(2)]Cl_(2)`C. `[PtCl_(2)(NH_(3))_(2)]`D. `[Pt.R.(NH_(2))_(2)]Cl_(2)]` |
| Answer» Correct Answer - C | |
| 89. |
The secondary valencey of platinum in tetra ammine dichloroplatinum (IV) chloride isA. `+4`B. `+2`C. `3`D. 6 |
| Answer» Correct Answer - D | |
| 90. |
The EAN of iron in potassium ferricyanide isA. 18B. 54C. 35D. 23 |
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Answer» Correct Answer - C EAN of a central metal ion `=` ( atomic no. of central atom ) `-` oxidation state `+` no. of ligands `xx 2 = 26-3+(6 xx 2 ) = 23 + 12 = 35` |
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| 91. |
The type of magnetism exhibited by `[Mn(H_(2)O)_(6)]^(2+)` ion is `"________"` .A. ParamagnetismB. DiamagnetismC. Both (a) and (b)D. None of these |
| Answer» Correct Answer - A | |
| 92. |
Which of the following complexx ion has least stabilityA. `[Co(CN)_(6)]^(3-)`B. `[Co(NH_(3))_(6)]^(2+)`C. `[Co(NH_(3))_(6)]^(3+)`D. `[Co(CO)_(6)]^(3+)` |
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Answer» Correct Answer - B Higher the oxidation state of central atom, higher will be stability. |
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| 93. |
Among the following, which is not the `pi`-bonded organometallic compoundA. `(CH_(3))_(4)Sn`B. `K[PtCl_(3)(eta^(2)-C_(2)H_(4))]`C. `Fe(eta^(5)-C_(5)H_(5))_(2)`D. `Cr(eta^(6)-C_(6)H_(6))_(2)` |
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Answer» Correct Answer - A `(CH_(3))_(4)Sn` is a `sigma`- bonded organometallic compound. |
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| 94. |
Which of the following does not have a metal carbon bond?A. `K[Pt(C_(2)H_(4))Cl_(3)]`B. `Ni(CO)_(4)`C. `Al(OC_(2)H_(5))_(3)`D. `C_(2)H_(5)MgBr` |
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Answer» Correct Answer - C `Al(OC_(2)H_(5))_(3)` contains bonding through O and thus it does not have metal-carbon bond. |
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| 95. |
Which of the following organometallic compound is `sigma` and `pi`-bonded?A. `Fe(CH_(3))_(2)`B. `[Fe(eta^(5) - C_(5)H_(5))_(2)]`C. `[Co(CO)_(5)NH_(3)]^(2+)`D. `K[PtCl_(3) n^(2) - C_(2)H_(4)]` |
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Answer» Correct Answer - B `[Fe(eta^(5)-C_(5)H_(5))_(2)]` is the organometallic compound which has `sigma` and `pi` bonds present. |
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| 96. |
Anhydrous ferric chloride is prepared by:A. Heating hydrated ferric chloride at a high temperature in a stream of airB. Heating metallic iron with hydrochloric acidC. Reaction of metallic iron with hydrochloric acidD. Reaction of metallic iron wit nitric acid |
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Answer» Correct Answer - B `2Fe+3Cl_(2)("dry")rarr2FeCl_(3)`(anhydrous) |
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| 97. |
Which of the following has longest `C-O` bond length? (Free `C-O` bond length in CO is `1.128Å`).A. `Ni(CO)_(4)`B. `[Co(CO)_(4)]^(o-)`C. `[Fe(CO)_(4)]^(2-)`D. `[Mn(CO)_(6)]^(+)` |
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Answer» Correct Answer - C `[Fe(CO)_(4)]^(2-)` Since metal atom is carrying maximum -ve charge therefore it would show maximum synergic bonding as a result C-O bond length would be maximum . |
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| 98. |
`[Fe(NO_(2))_(3)Cl_(3)]` and `[Fe(O-NO)_(3)Cl_(3)]` showA. Linkage isomerismB. Geometrical isomersmC. Optical isomerismD. None of the above |
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Answer» Correct Answer - A `[Fe(NO_(2))_(3)Cl_(3)]` and `[Fe(ONO)_(3)Cl_(3)]` show linkage isomerism . This type of isomerism is shown by the complexes in which an ambidentate ligand is present. `NO_(2)^(-),SCN^(-),CN^(-)` etc. are ambidentate ligand as each of them contain more than one donor sites. In the linakge isomerism, at a time only one donor atom of ligand is bonded to metal atom and hence arises linkage isomerism. |
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| 99. |
The number of possible isomers of an octahedral complex `[Co(C_(2)O_(4))_(2)(NH_(3))_(2)]` isA. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - C cis and trans forms, cis forms is in two optically active isomeric forms. |
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| 100. |
The pair in which both species have same magnetic moment (spin only value) is .A. `[Cr(H_(2)O)_(6)]^(2+),[CoCl_(4)]^(2-)`B. `[Cr(H_(2)O)_(6)]^(2+),[Fe(H_(2)O)_(6)]^(2+)`C. `[Mn(H_(2)O)_(6)]^(2+),[Cr(H_(2)O)_(6)]^(2+)`D. `[CoCl_(4)]^(2+),[Fe(H_(2)O)_(6)]^(2+)` |
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Answer» Correct Answer - B Both have 4 unpaired electron. |
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