NEET Chemistry Chapter Wise Mock Test – Coordination Compounds

NEET Chemistry Chapter Wise Mock Test – Coordination Compounds

Question 1.
Which is not π-bonded complex?
(a) Zeise’ssalt
(b) Ferrocene
(c) Dibenzene chromium
(d) Tetraethyl lead

Question 2.
Which of the following is not considered as an organometallic compound?
(a) Cis-platin
(b) Ferrocene
(c) Zeise’s salt
(d) Grignard’s reagent

Question 3.
According to Lewis concept, the ligands are
(a) acidic in nature
(b) basic in nature
(c) neither acidic nor basic
(d) some are acidic and others are basic

Question 4.
Coordination number of Ni in [Ni(C₂O₄)₃]^4- is
(a) 3
(b) 4
(c) 5
(d) 6

Question 5.
EDTA has coordination number
(a) 3
(b) 4
(c) 5
(d) 6

Question 6.
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 bonds
(b) the number of ligands around a metal ion bonded by pi bonds
(c) the number of ligands around a hnetal ion bonded by sigma and pi bonds both
(d) the number of only anionic ligands bonded to the metal ion

Question 7.
Among the following complexes (K-P), K₃[Fe(CN)₆](K), [CO(NH₃)₆]Cl₃(L), Na₃[Co(ox)₃](M), [Ni(HpO)₆]Cl₂ (N), K₂[Pt(CN)₄](O) and [Zn(H₂O)₆](NO₃)₂(P) the diamagnetic complexes are
(a) K, L, M, N
(b) K, M, O, P
(c) L, M, O, P
(d) L, M, N, O

Question 8.
The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is
(a) d⁵ (in strong ligand field)
(b) d³ (in weak as well as strong ligand fields)
(c) d⁴ (in weak ligand field)
(d) d⁴ (in strong ligand field)

Question 9.
The magnetic moment of K₃[Fe(CN)₆] is found to be 1.7 BM. How many unpaired electrons(s) is/are present per molecule?
(a) 1
(b) 2
(c) 3
(d) 4

Question 10.
The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Ni²⁺ are 3d⁴, 3d⁵, 3d⁶ and 3d⁸ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (Atomic number Cr=24, Mn=25, Fe=26, Ni=28)
(a) [Mn(H₂O)₆]²⁺
(b) [Fe(H₂O)₆]²⁺
(c) [Ni(H₂O)₆]²⁺
(d) [Cr(H₂O)₆]²⁺

Question 11.
[Cr(H₂O)₆]Cl₃(atomic number of Cr=24) has a magnetic moment of 3.83 BM, the correct distribution of 3d-electrons in the chromium of the complex is

Question 12.
Why do compounds having similar geometry have different magnetic moment?
(a) Due to different reactivity
(b) Due to their labile nature
(c) Due to the presence of weak and strong field ligands
(d) None of the above

Question 13.
The correct order of magnetic moments (spin only value in BM) among, the following is (Atomic number Mn=25, Fe=26, Co=27)
(a) [MnCl₄]^2- > [CoCl₄]^2- > [Fe(CN)₆]^4-
(b) [MnCl₄]^2- > [Fe(CN)₆]^4- > [CoCl]^2-
(c) [Fe(CN)₆]^4- > [MnC₄]^2- > [CoCl₄]^2-
(d) [Fe(CN)₆]^4- > [CoCl₄]^2- > [MnCl₄]^2-

Question 14.
The effective atoftiic number of Cr (Z=24) in [Cr(NH₃)₆]Cl₃ is
(a) 35
(b) 27
(c) 33
(d) 36

Question 15.
Both Co³⁺ and Pt⁴⁺ have a coordination number of six. Which of the following pairs of complexes will show approximately the same electrical conductance for their 0.001 M aqueous solutions?
(a) CoCl₃.4NH₃ and PtCl₄.4NH₃
(b) CoCl₃.3NH₃ and PtCl₄.5NH₃
(c) CoCl_3.6NH₃and PtCl₄.5NH₃
(d) CoCl₃.6NH₃ and RCl₄.3NH₃

Question 16.
A complex compound of Co³⁺ with molecular formula CoCl_x.yNH3 gives a total of 3 ions when dissolved in water. How many Cl^– ions satisfy both primary and secondary valencies in this complex?
(a) 3
(b) 1
(c) 4
(d) 0

Question 17.
Which does not give a precipitate with AgNO₃ solution?
(a) [CO(NH₃)₆]Cl₃
(b) [CO(NH₃)₅Cl]Cl₂
(c) [CO(NH₃)4Cl₂]Cl
(d) [CO(NH₃)₃Cl₃]

Question 18.
When 1 mole of CrCl₃.6H₂O is treated with excess of AgNO₃, 3 moles of AgCl are obtained. The formula Of the complex is
(a) [CrCl₃ (H₂O)₃].3H₂O
(b) [CrCl₂(H₂O)₄]Cl.2H₂O
(c) [CrCl(H₂O)₅]Cl₂.H₂O
(d) [Cr(H₂O)₆]Cl₃

Question 19.
A solution containing 2.675g of CoCl₃.6NH₃(molar mass=267.5 g mol^-1) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of AgNO₃ to give 4.78g of AgCl (molar mass=14.5 g mol^-1). The formula of the complex is (Atomic mass of Ag=108u)
(a) [CO(NH₃)₆]Cl₃
(b) [COCl₂(NH)₃]₄Cl
(c) [COCl₃(NH₃)₃]
(d) [COCl(NH₃)₅]Cl₂

Question 20.
Two isomers X and Y with the formula Cr(H₂O)₅ClBr₂ 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 due to 3 moles of particles. The structural formula of X and Y respectively, are
(a) [Cr(H₂O)₅Cl]Br₂ ; [Cr(H₂O)₄Br₂]Cl.H₂O
(b) [Cr(H₂O)₅Cl]Br₂ ; [Gr(H₂O)₃ClBr₂.2H₂O]
(c) [Cr(H₂O)₅Br]BrCl ; [Cr(H₂O)₄ClBr]Br.H₂O
(d) [Cr(H₂O)₄Br2]ClH₂O ; [Cr(H₂O)5Cl]Br₂

Question 21.
IUPAC name of Na₃[Co(NO₂)₆] is
(a) sodiumcobaltnitrite
(b) sodiumhexanitrito cobaltate (III)
(c) sodiumhexanitrocobalt(III)
(d) sodiumhexanitrocobaltate (III)

Question 22.
IUPAC name of K₃[Fe(CN)₆] is
(a) potassiumhexacyanoferrate (III)
(b) potassiumhexacyanoferrate (II)
(c) hexacyanoferrate (III)
(d) potassiumferricyanide

Question 23.
Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type [Pd(C₆H₅)₂(SCN)₂] and [Pd(C₆H₅)₂(NCS)₂] are
(a) linkage isomers
(b) coordination isomers
(c) ionisation isomers
(d) geometrical isomers

Question 24.
A complex of the type [M(AA)₂X₂]ⁿ⁺ is known to be optically active. What does this indicate about the structure of the complex?
(a) It has an octahedral geometry
(b) It is a tetrahedral complex
(c) It is a trans complex
(d) None of the above .

Question 25.
Which of the following complex will show geometrical as well as optical isomerism? (en=ethylene diamine)
(a) [Pt(NH₃)₂Cl₂]
(b) [Pt(NH₃)Cl₄]
(c) [Pt(en)₂Cl₂]
(d) [Pt(en)₃]⁴⁺

Question 26.
Which one of the following complex ions has geometrical isomers?
(a) [Co(en)3]³⁺
(b) [Ni(NH₃)₅Br]⁺
(c) [Co(NH₃)₂(en)₂]³⁺
(d) [Cr(NH₃)₄(en)]³⁺

Question 27.
Which of the following compounds exhibits linkage isomerism?
(a) [Co(en)₃]Cl₃
(b) [Co(NH₃)₆][Cr(en)₃]
(c) [Co(en)₂NO₂Cl]Br
(d) [Co(NH₃)₅Cl]Br₂

Question 28.
Indicate the complex ion which shows geometrical isomerism.
(a) [Cr(H₂O)₄Cl₂]⁺
(b) [Pt(NH₃)₃Cl]
(c) [Co(NH₃)₆]³⁺
(d) [Co(CN)₂(NC)]^3-

Question 29.
Which one of the following complex is an outer orbital complex?
(Atomic number: Mn=25,Fe=24,Co=27,Ni=28)
(a) [Fe(CN)₆]^4-
(b) [Mn(CN)₆]^4-
(c) [Co(NH₃)₆]³⁺
(d) [Ni(NH₃)₆]²⁺

Question 30.
The number of unpaired electrons in the complex ion [CoF₆]^3- is (atomic number of Co=27)
(a) 2
(b) 3
(c) 4
(d) 0

Question 31.
The number of d-electrons in [Cr(H₂O)₆]³⁺ (atomic number of Cr=24) is
(a) 2
(b) 3
(c) 4
(d) 5

Question 32.
An aqueous solution of CoCl₂ on addition of excess of concentrated HCl turns blue due to formation of
(a) [Co(H₂O)₄Cl₂]
(b) [Co(H₂O)₂Cl₄]^2-
(c) [CoCl₄]^2-
(d) [Co(H₂O)₂Cl₂]

Question 33.
Among [Ni(CO)₄], [Ni(CN)₄]^2-, [NiCl₂]^2- species, the hybridisation states of the Ni atom are respectively (Atomic number of Ni = 28)
(a) sp³, dsp², dsp²
(b) sp³, dsp², sp³
(c) sp³,sp³,dsp²
(d) dsp², sp³, sp

Question 34.
In which of the following octahedral complexes of Co (atomic number=27), will have highest magnitude of Δ₀?
(a) [Co(CN)₆]^3-
(b) [Co(C₂O₄)₃]^3-
(c) [Co(H₂O)₆]³⁺
(d) [Co(NH₃)₆]³⁺

Question 35.
Among the ligands NH₃, en, CN^– and CO, the correct order of their increasing field strength, is
(a) CO< NH₃< en< CN^–
(b) NH₃< en< CN^–< CO
(c) CN^– < NH₃ < CO < en
(d) en < CN^– < NH₃ < CO

Question 36.
Which of the following complexes formed by Cu²⁺ ions is most stable?

Question 37.
Which of the following compounds is not coloured?
(a) Na₂[CuCl₄]
(b) K₄[Fe(CN)₆]
(c) K₃[Fe(CN)₆]
(d) Na₂[CdCl₄]

Question 38.
Nickel (Z=28) combines with a uninegative monodentate ligand X^– to form a paramagnetic complex [NiX₄]^2-. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively
(a) one, tetrahedral
(b) two, tetrahedral
(c) one, square planar
(d) two, square planar

Directions (Q.Nos.39-40): In the following questions more than one of the answers may be correct. Select the correct answer and mark it accoding to the codes.
Codes
(a) 1,2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 39.
Which of the following complexes are not correctly matched with hybridisation of their central metal ion?
1. [Ni(CN)₄]^2- sp³
2. [COF₆]^3- d²sp³
3. [Fe(CN)₆]^3- sp³d²
4. [Ni(CO)₄] sp³

Question 40.
Octahedral Co(NH₃)4Br₂Cl₂ shows isomerism
1. ionisation
2. geometrical
3. optical
4. coordination

Question 41.
Match Column I and Column II and choose the correct matching codes given below.

Direction (Q.NOs.42-43): Each of these questions contains two statements: Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Question 42.
Assertion: [Ti(H₂O)₆]³⁺ is coloured while [Sc(H₂O)₆]³⁺ colourless.
Reason: d-d transition is not possible in [Sc(H₂O)₆]³⁺.

Question 43.
Assertion: [Co(NO₂)₃(NH₃)₃] does not show optical isomerism.
Reason: It has a plane of symmetry.

Question 44.
Which of these statements about [Co(CN)6]^3- is true?
(a) [CO(CN)₆]^3- has no unpaired electrons and will be in a low-spin configuration
(b) [CO(CN)₆]^3- has four unpaired electrons and will be in a low-spin configuration
(c) [CO(CN)₆]^3- has four unpaired electrons and will be in a high-spin configuration
(d) [CO(CN)₆]^3- has no unpaired electrons and will be in a high-spin configuration

Question 45.
Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C?
(a) CoCl₃.3NH₃
(b) CoCl₃.4NH₃
(c) C0Cl₃.5NH₃
(d) C0Cl₃.6NH₃

Question 46.
Among the following complexes the one which shows zero crystal field stabilisation energy (CFSE) is
(a) [Mn(H₂O)₆]³⁺
(b) [Fe(H₂O)₆]³⁺
(c) [Co(H₂O)₆]³⁺
(d) [Co(H₂O)₆]³⁺

Question 47.
Which of the following complexes is used to be as an anticancer agent?
(a) mer-[Co(NH₃)₃Cl₂]
(b) cis-[PtCl₂(NH₃)₂]
(c) cis-K₂[PtCl₂Br₂]
(d) Na₂CoCl₄

Question 48.
An excess of AgNO₃ is added to 100mL of a 0.01m solution of dichloro tetra aquachromium (III) chloride. The number of moles of AgCl precipitated would be
(a) 0.002
(b) 0.003
(c) 0.01
(d) 0.001

Question 49.
Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
(a) [Ni(NH₃)₆]²⁺
(b) [Zn(NH₃)₆]²⁺
(c) [Cr(NH₃)₆]³⁺
(d) [Co(NH₃)₆]³⁺

Question 50.
Which compound is zerovalent metal complex?
(a) [Cu(NH₃)₄]SO₄
(b) [Pt(NH₃)₂Cl₂]
(c) [Ni(CO)₄]
(d) K₃[Fe(CN)₆]

Question 51.
Potassium ferrocyanide is an example of
(a) tetrahedral
(b) octahedral
(c) square planar
(d) linear

Question 52.
The complexes [Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)₆][Co(CN)₆] are the examples of which type of isomerism?
(a) Ionisation isomerism
(b) Coordination isomerism
(c) Geometrical isomerism
(d) Linkage isomerism

Question 53.
The complex, [Pt(py)(NH₃)BrCl] will have how many geometrical isomers?
(a) 4
(b) 0
(c) 2
(d) 3

Question 54.
Of the following complex ions, which is diamagnetic in nature?
(a) [Ni(CN)₄]^2-
(b) [CuCl₄]^2-
(c) [CoF₆]^3-
(d) [NiCl₄]^2-

Question 55.
The IUPAC name of K₂[Ni(CN)₄] is
(a) potassium tetracyanonickelate (II)
(b) potassium tetracyanato nickelate (III)
(c) potassium tetracyanatonickel (II)
(d) potassium tetracyanonickel (III)

Question 56.
Which of the following compounds shows optical isomerism?
(a) [Co(CN)₆]^3-
(b) [Cr(C₂O₄)₃]^3-
(c) [ZnCl₄]^2-
(d) [Cu(NH₃)₄]²⁺

Question 57.
Crystal field stabilisation energy for high spin d⁴ octahedral complex is
(a) -1.8Δ₀
(b) -1.6Δ₀+p
(c) -1.2Δ₀
(d) -0.66Δ₀

Question 58.
Which of the following complex ions is not expected to absorb visible light?
(a) [Ni(CN)₄]^2-
(b) [Cr(NH₃)₆]³⁺
(c) [Fe(H₂O)₆]²⁺
(d) [Ni(H₂O)₆]²⁺

Question 59.
The existence of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂]⁺ is due to
(a) linkage isomerism
(b) geometrical isomerism
(c) coordination isomerism
(d) ionisation isomerism

Question 60.
In the complex ion [Co(NH₃)₆]³⁺, the NH₃ molecules are linked to the central metal ion by
(a) ionic bonds
(b) covalent bonds
(c) coordinate bonds
(d) hydrogen bonds

Question 61.
[CoCl₂(NH₃)4⁺] + Cl- ——–> [CoCl₃(NH₃)₃] + NH₃
In the reaction only one isomer of complex product is obtained. The initial complex is
(a) cis isomer
(b) trans isomer
(c) not having stereoisomers
(d) either cis or trans

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