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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.
| 251. |
What is the ratio of uncomplexed to complexed to complexed `Zn^(2+)` ion in a solution that is `10 M "in" NH_(3) ` . If the stability constant of `[Zn(NH_(3))_(4)]^(2+)` is `3xx10^(9)`?A. `3.3xx10^(-9)`B. `3.3xx10^(-11)`C. `3.3xx10^(-14)`D. `3xx10^(-13)` |
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Answer» Correct Answer - C `Zn^(2) +4NH_(3) hArr [Zn(NH_(3))_(4)]^(2+)` `K_(f ) =([Zn(NH_(3))_(4)]^(2+))/([Zn^(2+)][NH_(3)]^(4)=3xx10^(9)` `therefore ([Zn(NH_(3))_(4)]^(2+))/([Zn^(2+)]=[NH_(3)]^(4)xx3 xx10^(9)` ` = 10^(4) xx3xx10^(9) = 3xx10^(13)` `therefore ([ Zn^(2+)])/([Zn(NH)_(3)_(4)]^(2+))=3.3xx10^(-14)` |
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| 252. |
Match the column I with the column II and mark the appropriate choice . A. `(A) to (ii) , (B) to (iii) , (C) to (i) , (D) to (iv) `B. `(A) to (i) , (B) to (iii) , (C) to (ii) , (D) to (iv)`C. `(A) to (iii) , (B) to (i) , (C) to (iv) , (D) to (ii)`D. `(A) to (i) , (B) to (iv) , (C) to (ii) , (D) to (iii)` |
| Answer» Correct Answer - C | |
| 253. |
Match the column I with column II and mark the appropriate choice . A. `(A) to (i) , (B) to (iv) , (C) to (ii) , (D) to (iii)`B. `(A) to (ii) , (B) to (iii) , (C) to (iv) , (D) to (i) `C. `(A) to (iii) , (B) to (i) , (C) to (iv) , (D) to (ii)`D. `(A) to (iv) , (B) to (ii) , (C) to (iii) , (D) to (i)` |
| Answer» Correct Answer - B | |
| 254. |
Match the examples given in column I with the shapes of the compounds given in column II and mark the appropriate choice . A. `(A) to (i) , (B) to (ii) , (C) to (iii) , (D) to (iv)`B. `(A) to (iii) , (B) to (ii) , (C) to (iv) , (D) to (i)`C. `(A) to (iv) , (B) to (iii) , (C) to (ii) , (D) to (i) `D. `(A) to (ii) , (B) to (i) , (C) to (iii) , (D) to (iv)` |
| Answer» Correct Answer - B | |
| 255. |
Classify each of the following complexes as either high or low spin . Explain your answers. (i) `[Co(H_(2)O)_(6)]^(2+) mu= 3.87 B.M. " " [Co(CN)_(6)]^(3-) mu=0.0 B.M.` (ii) `[Fe(NO_(2))_(6)]^(4-) mu=0.0 B.M." "[Fe(H_(2)O)_(6)]^(3+) mu =5.94 B.M. ` |
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Answer» (i) Each contain `Co^(2+)` ions in an octahedral field. Obvioulsy compound `[Co(H_(2)O)_(6)]^(2+)` is a high spin having magnetic moment value of 3.87 B.M. whereas `[Co(CN)_(6)]^(3-)` is low spin with a magnetic moment value of 0.0 B.M. (ii) The complex `[Fe(NO_(2))_(6)]^(4-)` contain `Fe^(2+)` which belongs to a `d^(6)` system . As the magnetic moment of the complex is zero , it indicates that all 6 electrons are paired up hence the compound is low spin on the other hand the magnetic moment of the 5.94 B.M. for the complex `[Fe(H_(2)O)_(6)^(3+)` corresponds to five unpaired electron in `Fe^(3+)` . It indicates , there is no pairing of d-electrons of `Fe^(3+)` ion . Hence complex is high spin . |
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| 256. |
The negative ligand isA. (a) AquaB. (b) SulphatoC. (c) CarboxylD. (d) Nitro sonium |
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Answer» Correct Answer - B Negative ligands end in `-O`, e.g. `SO_4^(2-)` (sulphato). |
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| 257. |
In the compound lithium tetrahydridoaluminate, the ligand isA. (a) `H^(+)`B. (b) `H^(-)`C. (c) `H`D. (d) None of these |
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Answer» Correct Answer - B Lithium tetrahydridoaluminate is `Li[Al(H)_4`]. |
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| 258. |
Select the correct statementA. `[Co(EDTA)]^(-)` has two optical isomers.B. `[Co(NH_(3))_(5)(NO_(2))]^(2+)` show linkage isomerismC. For `[Pt(NH_(3))BrClI(NO_(2))py]`, theroretically fifteen different geometrical isomers are possible .D. `[Cr(H_(2)O)_(4)Cl_(2)]Cl_(2).2H_(2)O)` is an example of hydrate as well as ionisation isomerism. |
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Answer» Correct Answer - A::B::C (A) `[Co(EDTA)]^(1)hArr` shows optical isomerism. (B) `NO_(2)^(-)` being bidentate ligands can attach to central metal ion through N or O. (C ) It is Mabcdef type and thus have fifteen different geometrical isomers. (D) Ionisation isomerism involves exchange of different ions between coordination sphere and ionisation sphere. In complex `[Cr(H_(2)O)_(4)Cl_(2)]Cl_(2).2H_(2)O`, same anionic ligands, i.e., `Cl^(-1)` are present in coordination sphere and ionisation sphere , so no exchange of ions takes place. |
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| 259. |
Which of the following are `pi`-bonded organometallic compounds ?A. ferroceneB. Diethyl zincC. Ethylmagnesium iodideD. Bis(benzene) chromium(0) |
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Answer» Correct Answer - A::D (A) and (D) are `pi`-bonded organometallic compounds as they involve the formation of `pi`-bonds between metal and carbon. (B) and (C ) are `sigma`-bonded organometallic compounds as they form `sigma` bond by sharing of electrons between metal and carbon. |
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| 260. |
Double salts are addition compounds which lose their identity in aqueous solution whereas complexes which are also addition compounds do not lose their identity in aqueous solution. The coordination compounds show isomerism and find applications in photography, qualitative analysis, metallurgy, water purification and in the treatment of various diseases . Which of the following statment is incorrect ?A. Alum is a double saltB. EDTA salt of calcium is used in the treatment of lead poisoning.C. Effective atomic number of the metal in complexes `[Ni(CO)_(4)] and [Fe(CN)_(6)]^(4-)` is same.D. Chloridotris (triphenylphosphine) rhodium (I) is effective heterogeneous catalyst for hydrogenation of alkenes. |
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Answer» Correct Answer - D It is homogeneous catalyst for hydrogenation of alkenes. |
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| 261. |
Write the sum of geometrical isomers in `[Pt(H_(2)N-CH(CN_(3))-COoverset(Θ)O)_(2)]` complex and stereoisomers of `[Pt(gly)_(3)]^(o+)` complex . |
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Answer» Correct Answer - 8 Total number of geometrical isomers in `[Pt(H_(2)N-CH(CH_(3))-COO^(Θ))_(2)]=4` Total number of stereoisomer in `[Pt(gly)_(3)]^(o+)=4` Some of geometrical isomers and stereoisomers og given complexes `=8` . |
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| 262. |
The name of complex ion, `[Fe(CN_(6))]^(3-)` isA. hexacyanoiron (III) ionB. hexacyanitoferrate (III) ionC. tricyanoferrate (III) ionD. hexacyanidoferrate (III)ion |
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Answer» Correct Answer - D Key Concept When complex 10n is an anion, the name of the metal ends with suffix -ate along with its oxidation number in the complex ion `[Fe(CN)_(6)^(3)`= Hexacyanoferrate (III) ion |
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| 263. |
The IUPAC name of compound `Na_3[Co(ONO)_6]` will beA. (a) hexanitritocobalt (III) sodiumB. (b) sodium cobalt nitriteC. (c) sodium hexanitrocobaltate (III)D. (d) sodium hexanitrito-o-cobaltate (III) |
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Answer» Correct Answer - D sodium hexanitrito-o-cobaltate (III) |
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| 264. |
When `[Ni(NH_(3))_(4)]^(2+)` is treated with conc `HCI`, two compounds having the formula `Ni(NH_(3))(2)CI_(2)` are formed. A solution of I reacts with oxalic acid to form `Ni(NH_(3))_(2)(C_(2)O_(4))`. II does not react with oxalic acid. Deduce the configuration of I and II and the geometry of Ni (II) complexes .A. (a) (I) cis, (II) trans, both tetrahedralB. (b) (I) cis, (II) trans, both square planarC. (c) (I) trans, (II) cis, both tetrahedralD. (d) (I) trans, (II) cris, both square planar |
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Answer» Correct Answer - B Chelate ligands i.e. oxalato being too small to span the trans-positions and thus prefer to occupy the cis-position. So (I) is cis and (II) is trans. Platinum is in `+2` oxidation state with `5d^8` valence shell electron configuration. This configuration has higher CFSE and thus favours square planar geometry. |
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| 265. |
The oxidation state of oxygen in `O_2[PtF_6]` isA. (a) zeroB. (b) `-1//2`C. (c) `+1`D. (d) `+1//2` |
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Answer» Correct Answer - D `O_2[PtF_6]` is considered to be formed from `O_2^+` and `[PtF_6]^(1-)`. In `O_2^(+1)`, oxidation state of `O` is `2x=+1`. `x=+1/2` |
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| 266. |
Which of the following is not true for ligard-metal complex?A. (a) Larger the ligand, the more stable is the metal-ligand bondB. (b) Highly charged ligand forms strong bondC. (c) Larger the permanent dipole moment of ligand, the more stable is the bondD. (d) Greater the ionization potential of central metal, the stronger is the bond |
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Answer» Correct Answer - B The charge does not decide the formation of bond but availability of lone pair decides the formation of coordinate bond. |
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| 267. |
In the extraction of which of the following, complex ion formsA. (a) `Cu`B. (b) `Ag`C. (c) `Fe`D. (d) `Na` |
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Answer» Correct Answer - B `Ag_2S+4NaCN hArr 2Naunderset("Sodium dicyno argentate")([Ag(CN)_(2)]+ Na_2 S)` `2Na[Ag(CN)_2]+ZnrarrNa_2 underset("Sodium tetracyno zincate (ppt.)")([Zn(CN)_2]+2Agdarr)` |
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| 268. |
Which of the following is an organometallic compound?A. (a) Lithium methoxideB. (b) Lithium dimethyl amideC. (c) Lithium acetateD. (d) Methyl lithium |
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Answer» Correct Answer - D `CH_3Li` is the organometallic compound in which lithium bonded with carbon and organometallic are those in which metal-carbon bond is found. |
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| 269. |
`CH_3MgI` is an organometallic compound due toA. (a) `Mg-I` bondB. (b) `C-I` bondC. (c) `C-Mg` bondD. (d) `C-H` bond |
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Answer» Correct Answer - C Due to `C-Mg` bond. |
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| 270. |
An octahedral complex of `Co^(3+)` is diamagnetic . The hybridisation involved in the formation of the complex is :A. `sp^(3)d^(2)`B. `dsp^(2)`C. `d^(2)sp^(3)`D. `sp^(3)d` |
| Answer» Correct Answer - C | |
| 271. |
Which of the following is diamagnetic complexA. (a) `[Co(OX)_3]^(3-)`, `[Fe(CN)_6]^(3-)`B. (b) `[Co(Ox)_3]^(3-)`,`[FeF_6]^(3-)`C. (c) `[Fe(OX)_3]^(3)`, `[FeF_6]^(3-)`D. (d) `[Fe(CN)_6]^(3), [CoF_6]^(3-)` |
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Answer» Correct Answer - A Diamagnetic complex is/are `[Co(OX)_3]^(3-)` and `[Fe(CN)_6]^(3-)` |
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| 272. |
from the information given in the passage what is the most likely configuration of the cobalt d-electrons for the species `(A)` `CoCl_(6)^(3-)` and `(B)Co(No_(2))_(6)^(3-)` ? (a) both `(A)` and (B)` has low spin (b) both `(A)` and (B)` has low spin (c) both `(A)` and (B)` has low spin (d) both `(A)` and (B)` has low spin . |
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Answer» Correct Answer - b `CI^(Θ)` always behaves as weak field ligand so high spin complex formed Also here `Delta_(0)` is not sufficient to overcome pairing energey `P,NO_(2)` with `Co` behaves as strong field ligand and hence low spin complex Also `Delta_(0)gtP` and hence pairing takes place . |
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| 273. |
What factor determines whether the crystal field in an octahedral complex is to be regarded as strong or weak? How many d-electrons must be present in orbitals of the central atom atom for there to be an abrupt change in crystal field stabilisation energy strong and weak fields gt |
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Answer» Crystal field in an octahedral complex to be regarded as strong or weak depends on the relative magnitude of `Delta_(0)` and `P` (a) `If Delta_(0) gtP` Strong field (b) If `Delta_(0) ltP,` weak field Abrupt changes in crystal field stabisation energy between strong and weak fields occur with `d^(4),d^(5),d^(6)` and `d^(7)` configurations . |
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| 274. |
Which one of the following complexes will have six isomers ?A. `[Co(en)NH_(3)Cl_(2)]Cl`B. `[Cr(PPh_(3))_(2)(H_(2)O)_(2)Cl_(2)]Cl `C. `[Co(o x)_(3)]^(3-)`D. `[Co(en)_(2)Br]Cl` |
| Answer» Correct Answer - D | |
| 275. |
Which statement is incorrect?A. `[Ni(CO)_(4)]` - tretrahedral, paramagneticB. `[Ni(CN)_(4)]^(2-)` - square planar, diamagneticC. `[Ni(CO)_(4)]` - tetrahedral, diamagneticD. `[Ni(CI)_(4)]^(2-)` - tetrahedral, paramagnetic |
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Answer» Correct Answer - A In `[Ni(CO)_(4)]` , the oxidation number of Ni is zero. `Ni^(0) (3d^(8) 4s^(2))` Since CO is a strong field ligand, the electron configuration is resuffled so as to make 4s orbital empty for `sp^(3)` hybrization. All the electrons arer paired and the complex is tetrahedral. |
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| 276. |
Which of the following complexes will have four isomers ?A. `[Co(en)_(3)]CI_(3)`B. `[Co(en)_(2)CI_(2)]CI`C. `[Co(PPh_(3))_(2)(NH_(3))CI_(2)]CI`D. `[Co(PPh_(3))_(3)CI]CI_(2)` |
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Answer» Correct Answer - B Complex (1) exhibits optical isomerism and thus exits in two enantomeris form. Complex exhibits geometrical as well as optical isomerism. The cis - form is optically active. Thus, there are three isome: `(+)` - cis, `(-)` - cis and trans - form. Complex (3) being squar planar exhibits only geomertrical isomerism. Thus, it exists in two forms: cis- and trans. Complex (4) exhibits no isomerism. Thus, the maximum no. of isomers are of complex (2). |
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| 277. |
Which of the following will exhibit maximum ionic conductivity ?A. `K_(4)[Fe(CN)_(6)]`B. `[Co(NH_(3))_(6)]CI_(3)`C. `[Cu(NH_(3))_(4)]CI_(2)`D. `[Ni(CO)_(4)]` |
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Answer» Correct Answer - A Magnitude of ionic conductivity is directly related to the number od ions furnished by the copmlex in aq. Medium: `K_(4)[Fe(CN)_(6)] implies 4K^(+) + [Fe(CN)_(6)]^(4-)` (Five ions) `[Co(NH_(3))_(6)C1_(3) implies [Co(NH_(3))_(6)]^(3+) + 3C1^(-)` (Four ions) `[Cu(NH_(3))_(6)C1_(2) implies [Cu(NH_(3))_(4)]^(2+) + 2C1^(-)` (Three ions) `[NI(CO)_(4)] implies` zero ions as it is a molecule. |
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| 278. |
Which of the following will exhibit maximum ionic conductivity ?A. `K_(4)[Fe(CN)_(6)]`B. `[Co(NH_(3))_(6)]Cl_(3)`C. `[Cu(NH_(3))_(4)]Cl_(2)`D. `[Ni(CO)_(4)]` |
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Answer» Correct Answer - A Ionic conductivity depends upon the number of ions produced in aqueous solution `K_(4)[Fe(CN)_(6)]` produces maximum number of ions, i.e. 5. `underset("Total 5 ions")ubrace(4K^(+)+[Fe(CN)_(6)]^(4-))` `[Co(NH_(3))_(6)]Cl_(3)" produces 3, "[Cu(NH_(3))_(4)]Cl_(2)` produces 3 and `[Ni(Co)_(4)]` gives zero ions. |
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| 279. |
Which of the following will exhibit maximum ionic conductivity ?A. `K_(4)[Fe(CN_(6))]`B. `[Co(NH_(3))_(6]Cl_(3)`C. `[Cu(NH_(3))_(4)]Cl_(2)`D. `[Ni(CO)_(4)]` |
| Answer» Correct Answer - A | |
| 280. |
Which of the following shows maximum molar conductance ?A. `[Co(NH_(3))_(6)]Cl_(3)`B. `[Co(NH_(3))_(3)Cl_(3)]`C. `[Co(NH_(3))_(4)Cl_(2)]Cl`D. `[Co(NH_(3))_(5)Cl]Cl_(2)` |
| Answer» Correct Answer - A | |
| 281. |
__________ is used to prevent the infection of young plants . |
| Answer» Correct Answer - Ethylmercury chloride | |
| 282. |
The complex `[Cr(H_(2)O)_(4)Br_(2)]Cl` gives the test for :A. `Br^(-)`B. `Cl^(-)`C. `Cr^(3+)`D. `Br^(-) and Cl^(-)` both |
| Answer» Correct Answer - B | |
| 283. |
_________ is an important anti knock compound added to petrol used in internal combustion engines . |
| Answer» Correct Answer - Tetrahedral lead `(TEL)` | |
| 284. |
A biodentate ligand has 3 coordination sites . |
| Answer» Correct Answer - F | |
| 285. |
Tetrahedral complex cannot show geometrical isomerism . |
| Answer» Correct Answer - T | |
| 286. |
Coordination number and oxidation state of a metal means the same thing . |
| Answer» Correct Answer - F | |
| 287. |
STATEMENT-1: `[Co(NH_(3))_(3)Cl_(3)]` does not give white ppt . with `AgNO_(3)` solution . and STATEMENT-2: Chlorine is not present in the ionisable part of the given complex .A. Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-1B. Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1C. Statement-1 is True , Statement-2 is FalseD. Statement-1 is False , Statement-2 is True |
| Answer» Correct Answer - A | |
| 288. |
Coordination compounds are mainly known for transition metals . |
| Answer» Correct Answer - T | |
| 289. |
Ethylenediaminetraac etate ion froms an octo hedral complex with be metal ion Reason It has six donor atoms which coordinate simultaneously to the metal ion .A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .C. If`(A)` is correct, but `( R )` is incorrect .D. Both `(A)` and `(R ) ` are incorrect . |
| Answer» Correct Answer - A | |
| 290. |
Assertion Coordination compounds are generally formed by transition metals Reason Transition metals generally have partly filled d-orbitals of the nth shell .A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .C. If`(A)` is correct, but `( R )` is incorrect .D. Both `(A)` and `(R ) ` are incorrect . |
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Answer» Correct Answer - C Correct ` (R )` Transition metals have partially filled d-orbitals of the `(n-1)` shell . |
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| 291. |
Assertion The complex `[Co(NH_(3))_(3)CI_(3)]` gives no precipitate with `AgNO_(3)` solution Reason The given complex is non-ionisable .A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .C. If`(A)` is correct, but `( R )` is incorrect .D. Both `(A)` and `(R ) ` are incorrect . |
| Answer» Correct Answer - A | |
| 292. |
Which of the following statement`(s)` is//are correct?A. Primary valency of the central metal of a complex is always satisfied by anions .B. Secondary valency of the central metal of a complex may be satisfied by either negative ions or neutral molecules .C. Species which show primary valencies in a complex compound can be precipitated out .D. None of these |
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Answer» Correct Answer - A::B::C The species which show secondary valencies in a complex are Lewis base . |
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| 293. |
Select the correct `IUPA` name for the following A. Tetramminecobalt(III)muamido-mu-peroxidotetraamm inedicobalt(III) ionB. mu-Amido-mu-peroxidobis(tetraammine)dicobalt-(III)ionC. mu-Amido-mu-peroxidobis(tetraamminecobalt(III))ionD. mu-Amido-mu-peroxidobis(tetraamminecobalt(III))ion |
| Answer» Correct Answer - A::B::C::D | |
| 294. |
Which can form chelates?A. Ethylene diamineB. OxalateC. GlycinateD. Cyanide |
| Answer» Correct Answer - A::B::C | |
| 295. |
Which of the following does not show optical isomerism ?A. `[Co(en)_(2)Cl_(2)]^(+)`B. `[Co(NH_(3))_(3)Cl_(3)]^(0)`C. `[Co(en)Cl_(2)(NH_(3))_(2)]^(+)`D. `[Co(en)_(3)]^(3+)` |
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Answer» Correct Answer - B Optical isomerism is exhibited only by those complexes in which plane of symmetry are absent Octahedral complexes of the types`[M(aa)_(3)], [M(aa)_(x_(2)),y_(2)]" and "[M(aa)_(2)X_(2)]` have absence of plane of symmetry, thus exhibit. optical isomerism Here, aa represents bidentate ligand, x or y represents monodentate ligand and M represents central metal ion. Hence, `[Co(NH_(3))_(3)Cl_(3)]^(0)` due to presence of symmetry elements does not exhibit optical isomerism. Or Octahedral complexes of `[M("AA")_(2)B_(2)]" type , e.g. "[Co(en)_(2)Cl_(2)]^(+),[M("AA")B_(2)C_(2)]" type, e.g. "[Co(en)_(3)]^(3+)` show optical isomensim, whereas complexes of `[MA_(3)B_(3)]" type, e.g. "[Co(NH_(3))Cl_(2)]^(0)` do not show optical isomerism. |
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| 296. |
The crysal field splitting energy for octahedral `(Delta_(0))` and tetrahedral `(Delta_(t))` complexes is relatedA. `Delta_(t)=(4)/(9) Delta_(0)`B. `Delta_(t)=(1)/(2) Delta_(0)`C. `Delta_(0)=(2) Delta_(t)`D. `Delta_(0)=(4)/(9) Delta_(t)` |
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Answer» (a) The crystal field spliting energy for octahedral `Delta_(0)` and tetrahedral `(Delta_(t))` complexes is related to `Delta_(t)=(4)/(9) Delta_(0)` |
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| 297. |
Geometrical isomerism is shown byA. `[Ni(NH_(3))_(5)Br]^(+)`B. `[Cr(NH_(3))_(4)(en)]^(3+)`C. `[Co(en)_(3)]^(3+)`D. `[Co(NH_(3))_(2)(en)_(2)]^(3+)` |
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Answer» Correct Answer - D Geometrical isomerism is exhibited by octahedral complexes , `[ Co (NH_(3))_(2) (en)_(2)]^(3+)` . |
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| 298. |
Which of the following contain maximum number of electrons in the antibonding molecular orbitalsA. `O_(2)^(2-)`B. `O_(2)`C. `O_(2)^(-1)`D. `O_(2)^(+)` |
| Answer» Correct Answer - B | |
| 299. |
The effective atomic is shown byA. 35B. 27C. 33D. 36 |
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Answer» Correct Answer - C Effective atomic number `EAN=(24-3)+(6xx2)` `=21+12=33` |
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| 300. |
IUPAC name of `Na_(3)[Co(NO_(2))_(6)]` isA. sodium hexanitrito cobaltate (II)B. sodium hexanitro cobaltate (III )C. sodium hexanitritro cabaltate (III )D. sodium cobaltinitrite |
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Answer» Correct Answer - B The IUPAC name of ` Na _(3) [Co (NO_(2))_(6)]` is sodium hexanitrocobaltate (III ) . |
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