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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.
| 151. |
The following isomers refer to `[{(C_(6)H_(5))_"(3)"P}_(2)Pd(SCN)_(2)]` and `[{(C_(6)H_(5))_(3)P}_(3)Pd(NCS)_(2)]`A. Linkage isomersmB. Co-ordination isomerismC. Ionisation isomerismD. Geometrical isomerism |
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Answer» Correct Answer - A Factual question based on isomerism |
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| 152. |
What is the co-ordination number? |
| Answer» Co-ordination number is the number of the ligands that are linked to the metal atom or ion in the co-oridnation complex. | |
| 153. |
What do the abbreviations i) dien and ii) gly represent? |
| Answer» (i) `underset("diethylenetriamine"("dien"))(H_(2)ddotN-CH_(2)-CH_(2)-ddot(N)H-CH_(2)-CH_(2)-ddot(N)H_(2))` (ii) `{:(" "H_(2)C-ddot(N)H_(2)),(" "|),(underset("glycinate"("gly"))(O=C-O^(Theta))):}` | |
| 154. |
Do transition metal atoms act as Lewis bases in the co-ordination compounds? |
| Answer» No, they act as Lewis acid and not as Lewis base. Ligands or electrons donor species act as Lewis bases. | |
| 155. |
Which type of metals normally take part in the formation of co-ordination compounds? |
| Answer» Transition metals of d-block participate in hte formation of co-ordination compounds. | |
| 156. |
The colour of the co-ordination compounds is explained in terms of :A. spectrochemical seriesB. chelate effectC. crystal field theoryD. none of these |
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Answer» Correct Answer - C The colour of the co-ordination compounds is explained with the help of crystal field theory . |
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| 157. |
For the complex , `[Co(en)_(3)]^(3+)` , write the hybridisation type, magnetic character and spin nature of the complex. |
| Answer» `sp^(3)d^(2)` , paramagnetic and high spin complex . For details , consult section 8 . | |
| 158. |
Some salts although containing two different metallic elements give test for one of them in solution. Such salts are:A. Complex saltsB. Double saltsC. Normal saltsD. None . |
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Answer» Correct Answer - A Complex compounds or complex salts containing two different metallic elements give tests for only one element. For example potassium hexacyanoferrate (II), `K_(4)(Fe(CN)_(6)]` give tests only for `K^(+)` ions and not for `Fe^(2+)` ions. `K_(4)[Fe(CN)_(6)]hArr 4K^(+) + [Fe(CN)_(6)]^(4-)` |
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| 159. |
Which of the following will give maximum number of isomer ?A. `[Co(NH_(3))_(4)Cl_(2)]`B. `[Ni(en)(NH_(3))_(4)]^(2+)`C. `[Ni(C_(2)O_(4))(en)_(2)]`D. `[Cr(SCN)_(2)(NH_(3))_(4)]^(2+)` |
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Answer» Correct Answer - D `[Cr(SCN)_(2)(NH_(3))_(4)]^(+)` will show geometrical (or cistrans) and linkage isomerism. |
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| 160. |
Coordination number of `Ni` in `[Ni(C_2O_4)_3]^(4-)` is:A. 3B. 6C. 4D. 5 |
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Answer» Correct Answer - B `C_(2)O_(4)^(2-)` is a bidentate group . As the complex contains three bidentate groups , the central metal ion has a co-ordination number of 6 |
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| 161. |
`CuSO_(4)` dissolves in `NH_(3)` due to formation ofA. `Cu(OH)_(2)`B. `[Cu(NH_(3))_(4)]SO_(4)`C. `[Cu(NH_(3))_(4)(OH)_(2)]`D. CuO. |
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Answer» Correct Answer - B `CuSO_(4)+4NH_(3) rarr [Cu(NH_(3))_(4)]SO_(4)` |
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| 162. |
Which one of the following is an example of octahedral complex ?A. `[FeF_(6)]^(3-)`B. `[Zn(NH_(3))_(4)]^(2+)`C. `[Ni(CN)_(4)]^(2-)`D. `[Cu(NH_(3))_(4)]^(2+)` |
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Answer» Correct Answer - A `[FeF_(6)]^(3-)` with coordination number of 6 is an example of octahedral complex . |
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| 163. |
A complex `MA_(3)X_(3)`. Where A and X are unidentate ligands may giveA. two geometrical isomersB. three geometrical isomersC. two geometrical isomers which can be resolved into a pair of enantiomersD. two geometrical isomers one of which can be resolved into a pair of enantiomers . |
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Answer» Correct Answer - A `MA_(3)X_(3)` can exist as two geometrical isomers. |
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| 164. |
In `Fe(CO)_5`, the `Fe-C` bond possesses:A. `pi` character onlyB. both `sigma` and `pi`-charactersC. ionic characterD. `sigma` character . |
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Answer» Correct Answer - B Metals carbonyls have both `sigma ` and `pi`-bonds present. For more details , consult text part section 9,12. |
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| 165. |
In which of the pairs of ions given, there is an ion that forms a co-ordination compound both aqueous sodium hydroxide and ammonia and another ion that forms a co-ordination compound only with aqueous sodium hydroxide ?A. `Pb^(2+)`. `Cu^(2+)`B. `Zn^(2+)` , `Al^(3+)`C. `Cu^(2+)`, `Zn^(2+)`D. `Al^(3+), Cu^(2+)` |
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Answer» Correct Answer - B `Zn^(2+)` ion reacts with aqueous NaOH and `NH_3` and forms a co-ordination compound. `Zn^(2+)` + 4NaOH `` [`Zn(OH)_4]^(2-)` + 4`Na^(+)` `Zn^(2+)` + 4`NH_3` `` [ Zn(`NH_3)_4]^(2+)` `AL^(3+)` ion reacts only with NaOH and not with `NH_3` `Al^(3+)` + 4NaOH `` `[Al(OH)_4]^(-)` + `4Na^(+)` |
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| 166. |
The correct structure of `Fe(CO)_(5)` is (Z= 26 for Fe)A. OctahedralB. TetrahdralC. Square pyramidalD. Trigonal pyramidal |
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Answer» Correct Answer - C Fe(Z=26): `[Ar]^(18)4s^(2)3d^(6)` Fe after pairing up of six 3d-electrons in three d-orbitals, undergo `d^(2)sp^(3)`-hybridisation. One of the six hybridized orbitals so obtained contains a lons pair (from 4s-orbital). Thus shape of `Fe(CO)_(5)` is square pyuare pyramidal. |
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| 167. |
Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. Which of the following will not show geometrical isomerism ?A. `[Cr(NH_(3))_(4)Cl_(2)]Cl`B. `[CoCl_(2)(en)_(2)]Cl`C. `[Co(NH_(3))_(5)NO_(2)]Cl_(2)`D. `[Pt(NH_(3))_(2).Cl_(2)]` |
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Answer» Correct Answer - c Octahedral complexes of the type `MA_(5)B` do not show any geometrical isomerism. |
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| 168. |
Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. One mole of the complex compound `` gives 3 mole of ions on dissolution in water. One mole of the same complex reacts with two moles of `` to yield two moles of . The structure of the complex is :A. `[Co(NH_(3))_(3)Cl_(3)].2NH_(3)`B. `[Co(NH_(3))_(4)Cl_(2).NH_(3)`C. `[Co(NH_(3))_(4)Cl]Cl_(2).NH_(3)`D. `[Co(NH_(3))_(5)Cl]Cl_(2)` |
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Answer» Correct Answer - d The structure for the complex responds to the characteristics of the complex. |
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| 169. |
Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. Which one is the most likely structure of `` if 1/3 of the total chloride in the compound is precipitated by adding `` solution ?A. `CrCl_(3).6H_(2)O`B. `[Cr(H_(2)O)_(3)]Cl_(3)](H_(2)O)_(3)`C. `[Cr(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O`D. `[Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O` |
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Answer» Correct Answer - c is the correct answer because out of the three Cl atoms present, only one represents primary valency (ionisable) . |
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| 170. |
Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. 1 . Aqueous solutions of `` on addition of excess of concentrated HCl turns blue due to the formation ofA. `[Co(H_(2)O)_(4)Cl_(2)]`B. `[Co(H_(2)O)_(4)Cl_(4)]^(2-)`C. `[CoCl_(4)]^(2-)`D. `[Co(H_(2)O)_(2)Cl_(2)]` |
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Answer» Correct Answer - c `CoCl_2` is a weak Lewis acid and takes up two `Cl^(-)` ions to form a salt `[CoCl_4]^(2-)` which is tetrahedral . In the anhydrous state, `CoCl_2` is violet and in solution the tetrahedral salt formed on reacting with HCl is blue in colour. |
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| 171. |
What kind of the following species is not expand to be a ligand?A. linkage isomerismB. solvate isomerismC. ionisation isomerismD. coordination isomerism |
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Answer» Correct Answer - B solvate or hydrate isomerism is present. |
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| 172. |
The IUPAC name of `[Co(NH_(3))_(4)Cl(NO_(2))]Cl` isA. tetraaminechloridonitrito-N-cobalt(III) chlorideB. tetraminechloridonitrioicobalt(II) chlorideC. tetraaminechloridonitriocobalt(I) chlorideD. tetraaaminechloridonitrocobalt(III) chloride |
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Answer» Correct Answer - A It is the correct IUPAC name of the complex. |
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| 173. |
`A,B` and `C` are three complexes of chromium(III) with the empirical formula `H_(12)O_(6)C_(13)Cr` All the three complexes not react with concentrated `H_(2)SO_(4)` whereas complexes `B` and `C` lose `6.75%` and `13.5%` of their original mass respectively, on treatment on treatment with conectrated `H_(2)SO_(4)` Identify `A,B` and `C` . |
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Answer» The data suggests that the complexes are hydrate isomers. As the complex A does not lose any molecle of `H_(2)O` on heating with conc. `H_(2)SO_(4)` this means that no molecules of `H_(2)O` are Outside the co-ordinate sphere. The structure of the complex A is : `[CrH_(2)O_(6)]Cl_(3)` As B loses `67.5%`of weight on heating with conc. `H_(2)SO_(4)` , therefore actual loss in weight. = 6.75 / 100 `xx` 266.5 = 18 amu This means that the isomer B has one molecule of `H_(2)` existing as monohdrate . [B] : `[Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O` . As C loses 13.5% of weight on heating which is twice the loss in the first case, this shows that the isomer C exists as a dihydrate. [C] : `[CrH_(2)O_(4)Cl_(2)]Cl.2H_(2)O`. |
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| 174. |
The complexes `|Co(NH_(3))_(6)||Cr(C_(2)O_(4))_(3)|` and `|Cr(NH_(3))_(6)||Co(CrO_(4))_(3)|` areA. geometrical isomerismB. ionization isomerismC. coordination isomerismD. linkage isomerism. |
| Answer» Coordination isomerism is possible when both positive and negative ions of a salt are complex ions and the two isomers differ in disribution of ligands in the cation and the anion. | |
| 175. |
`|Pt(NH_(3))_(4)Cl_(2)|Br_(2) and |Pt(NH_(3))_(4)Br_(2)|Cl_(2)` ion are relatedA. optical isomersB. ilnkage isomersC. coordinate isomersD. ionization isomers . |
| Answer» Both have same composition but give different ions in the solution. | |
| 176. |
An cationic complex has two isomers A and B . Each has one `Co^(3+)`, five `NH_3` , one `Br^(-)` and one `SO_4^(2-)` . A gives a white precipitate with `BaCl_2` solution while B gives a yellow precipitate with `AgNO_3` solution. (a) What are the possible structures of the complexes A and B ? (b) Will the two complexes have same colour ? |
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Answer» (a) Since the isomer A gives a white precipitate with `BaSO_4` solution , `S0_4^(2-)` ion is present as anion in the complex A . Since B gives a yellow precipitate with `AgNO_3` solution . `Br^(-)` ion is present as anion in it. The two isomers are ionisation isomers and are shows : `[CO(NH_3)_(5)Br]SO_4` `[CO(NH_3)_(5)SO_4]Br` (A) pentaaminebromidocobalt (III) sulphate (B) pentaamminesulphatecobalt (III) bromide. (b) No, the two complexes have different colours. For details, consult Section 6. |
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| 177. |
A square planar complex represented as: A. Geomtrical isomerismB. optical isomerismC. Linkage isomerismD. No isomerism |
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Answer» Correct Answer - D Factual problems |
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| 178. |
Which of the following compound would exhibit co-ordination isomerism?A. `[Cr(H_(2)O)_(6)]Cl_(3)`B. `[Cr(NH_(3))_(6)][Co(CN)_(6)]`C. `[Cr(en)_(2)]NO_(2)`D. `[Ni(NH_(3))_(6)][BF_(4)]_(2)`. |
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Answer» Correct Answer - B The co-ordination isomers are , `[Cr(NH_(3))_(6)][Co(CN)_(6)]` and ` [Co(NH_(3))_(6)][Cr(CN)_(6)]` |
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| 179. |
The phenomenon of optical activity will be shown by:A. B. C. D. |
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Answer» Correct Answer - B Factual problems |
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| 180. |
One among the following complex ions will not show optical activityA. `[Pt(Br)(Cl)(I)(NO_(2))(C_(5)H_(5)N)(NH_(3))]^(-)`B. `cis-[Co(en)_(2)Cl_(2)]^(+)`C. `[Co(en)(NH_(3))_(2)Cl_(2)]^(+)`D. `[Cr(NH_(3))_(4)Cl_(2)]^(+)` |
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Answer» Correct Answer - D `[Cr(NH_(3))_(4)Cl_(2)]^(+)` does not possess chiral structure . |
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| 181. |
Of the following complex which one will show co-ordination isomerism ?A. `[Cr(NH_(3))_(6)][Co(en)_(3)]`B. `[Cr(NH_(3))_(6)]Cl_(2)`C. `[Co(en)_(2)Cl_(2)]Cl`D. `[Cr(en)_(2)Cl_(2)]^(+)` |
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Answer» Correct Answer - A Only (A) has both complex cation and complex anion. |
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| 182. |
The two complexes given given below are A. Geometrical isomersB. Position isomersC. Optical isomersD. Identical |
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Answer» Correct Answer - D Factual problems |
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| 183. |
Which one of the following complexes will have four isomers?A. `[CoCl_(2)(en)(NH_(3))_(2)]Cl`B. `[Co(NH_(3))_(2)Cl_(2)(PPh_(3))_(2)]Cl`C. `[Co(en)_(3)]Cl_(3)`D. `[CoCl_(2)(en)_(2)]Br` |
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Answer» Correct Answer - D The four isomers are ionisation isomers, cis and trans isomers. Cis isomer exists as two optical isomers (dextro and laevo). |
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| 184. |
Which of the following complexes can form d and l isomers ?A. `[Co(NH_(3))_(4)Cl_(3)]^(+)`B. `[Co(NH_(3))_(2)Cl_(3)]`C. trans-`[Co(en)_(2)Cl_(2)]`D. cis-`[Co(en)_(2)Cl_(2)]^(+)` |
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Answer» Correct Answer - D cis form of `[Co(en)_(2)Cl_(2)]^(+)` shows optical isomerism while trans form will not. |
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| 185. |
Out of the following which will not show geometrical isomerism ?A. `[Co(NH_(3))_(4)Cl_(2)]^(+)`B. `[Co(en)_(3)]^(3+)`C. `[Co(en)_(2)Cl_(2)]Cl`D. `[Cr(NH_(3))_(4)Cl_(2)]Cl` |
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Answer» Correct Answer - B `[Co(en)_(3)]^(3+)` will not show gometrical isomerism . |
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| 186. |
The compound `[CoCl_(3)I(C_(5)H_(5)N)_(2)] Br` will show the chemical test for which of the following ions? .A. `Br^(-)`B. `Cl^(-)`C. `I^(-)`D. `Br^(-)` as well as `Cl^(-)` |
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Answer» Correct Answer - A The compound ionises as `[CoCl_(3)I(C_(5)H_(5)N)_(2)]Br rarr [CoCl_(3)I(C_(5)H_(5)N)_(2)]^(+) + Br^(-)` Hence, it easily gives the test for `Br^(-)` ions. |
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| 187. |
Which of the following is not optically active?A. `[Co(o x)_(3)]^(3-)`B. `[Ce(en)_(3)]^(3+)`C. cis-`[CoCl_(2)(en)_(2)]^(+)`D. trans-`[CoCl_(2)(en)_(2)]^(+)` |
| Answer» trans-`[CoCl_(2)(en)_(2)]` is not optically active . | |
| 188. |
Identify the optically active compounds from the followingA. `[Co(en)_(3)]^(3+)`B. trans-`[Co(en)_(2)Cl_(2)]^(+)`C. `cis-[Co(en)_(2)Cl_(2)]^(-)`D. `[Cr(NH_(3))_(5)Cl]` |
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Answer» Correct Answer - A::C a,c are both optically active in nature. |
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| 189. |
Which of the following complexes show linkage isomerism ?A. `[Co(NH_(3))_(5)[NO_(2))]^(2+)`B. `[Co(H_(2)O)_(5)CO]^(3+)`C. `[Cr(NH_(3))_(5)SCN]^(2+)`D. `[Fe(en)_(2)Cl_(2)]^(+)` |
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Answer» Correct Answer - A::C a,c show linkage isomerism. |
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| 190. |
Which among the following will be named as dibromobis (ethane-1,2-diamine) chromium (III) bromide ?A. `[Cr(en)_(3)]Br_(3)`B. `[Cr(en)_(2)Br_(2)]Br`C. `[Cr(en)Br_(4)]^(-)`D. `[Cr(en)Br_(2)]Br` |
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Answer» Correct Answer - B b) it is the correct answer. |
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| 191. |
Identify the correct statements for the behaviour of ethane-1, 2-diamine as a ligand.A. It is a neutral ligandB. It is a didenate ligandC. It is a chelating ligandD. It is a unidenate ligand. |
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Answer» Correct Answer - A::B::C a,b,c are correct statements. |
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| 192. |
The two isomers X and Y with the formula `Cr(H_(2)O)_(5)ClBr` were taken for experiment on depression in freezing point. It was found that one mole of X gave depression corresponding to 2 moles of particles and one mole of Y gave depression to 3 moles of particles. The structural formulae of X and Y raspectively areA. `[Cr(H_(2)O)_(5)Cl]Br_(2), [Cr(H_(2)O)_(2)Br_(2)]Cl.H_(2)O`B. `[Cr(H_(2)O)_(5)Cl]Br_(2), [Cr(H_(2)O)_(3)ClBr]H_(2)O`C. `[Cr(H_(2)O)_(5)Br]BrCl, [Cr(H_(2)O)_(4)ClBr]H_(2)O`D. `[Cr(H_(2)O)_(4)Br_(2)]Cl.H_(2)O, [Cr(H_(2)O)_(5)Cl]Br_(2)` |
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Answer» 1 mole of complex X giving 2 moles of particles will be `[Cr(H_(2)O)_(4)Br_(2)]Cl.H_(2)O` i.e. `|Cr(H_(2)O)_(4)Br_(2)]^(+)+Cl^(-)` 1 mole of complex Y giving 3 moles of particles will be `|Cr(H_(2)O)_(5)Cl|Br_(2)` i.e. `|Cr(H_(2)O)_(5)Cl^(-)|^(2-)+2Br^(-)`. |
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| 193. |
The most satble complex among the following isA. `K_(3)[Al(C_(2)O_(4))_(3)]`B. `[Pt(en)_(2)]Cl_(2)`C. `[Ag(NH_(3))_(2)]Cl`D. `K_(2)[Ni(EDTA)]` |
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Answer» Correct Answer - D In the complex `K_(2)[Ni(EDTA)]` , EDTA is a hexadentate ligand. Such a complex will be more stable than complexes formed with bidentate ligands ilke `C_(2)O_(4)^(2-), (en)_(2)` or monodentate ligand , `NH_(3)`. |
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| 194. |
Is the complex `[Ni(CO)_(4)]` paramagnetic in nature? |
| Answer» No, the complex is diamagnetic in nature | |
| 195. |
Is the name potassium tris(oxalato) aluminium(III) for the complex `[K_(3)Al(C_(2)O_(4))_(3)]` correct? |
| Answer» No, it is wrong. The correct name of the complex is : potassium trioxalatoaluminate (III). | |
| 196. |
An example of `pi`-acid ligand isA. COB. NOC. `N_(2)`D. All of the above. |
| Answer» See Comprehensive Review. | |
| 197. |
Chloroplatinic acid isA. monobasicB. dibasicC. tribasicD. tetrabasic. |
| Answer» Chlorplatinic acid, `H_(2)PtCl_(6)` is a dibasic acid. | |
| 198. |
Which of the following statements are false ?A. `[Ni(CO)_(4)]` is high spin complexB. Weak ligands like `F^(-)` , `Cl^(-)` and `OH^(-)` usually from low spin complexesC. `[FeF_(6)]^(3-)` is a high spin complexD. Strong ligand like `CN^(-)` and `NO_(2)^(-)` , generally from high spin complexes. |
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Answer» Correct Answer - a,b,d (a,b,d) These statements are false. (a) `[Ni(CO)_4]` is a low spin complex. (b) Weak field ligands like `F^(-), Cl^(-) and OH^(-)` usually form high spin complexes . Strong field ligands like `CN^(-)` and `NO_2^(-)` usually form low spin complexes. |
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| 199. |
Which of the following statements are not correct ?A. If `Delta_(0)` lt P , low spin state is more stable .B. CO is a very weak ligand.C. The colour of a complex depends only on the nature of metal ion.D. Tetrahedral complexes have nearly 50% CFSE value than octahedral complexes . |
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Answer» Correct Answer - b,c (b,c) These statements are wrong. (b) CO is a strong field legand. (c) The colour of the complex depends not only on the metal ion but also on the nature of the ligand. |
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| 200. |
In the complex `[Pt(py)_4][PtCl_4]`, the oxidation numbers of `Pt` atom in former and latter part of the compund are respectivelyA. 0 and 0B. `+4` and `+2`C. `+2` and `+2`D. 0 and `+4` |
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Answer» Correct Answer - C `overset(II)([Pt(py)_(4)]^(2+))overset(II)([PtCl_(4)]^(2-))` |
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