JEE Chemistry Coordination Compounds MCQs Set A

Question. According to the postulates of Werner for coordination compounds
(a) primary valency is ionizable
(b) secondary valency is ionizable
(c) primary and secondary valencies are non-ionizable
(d) only primary valency is non-ionizable

Answer: A

Question. Which of the following postulates of Werner’s theory is incorrect?
(a) Secondary valence is equal to the coordination number and it depends upon the nature of ligand attached to metal.
(b) The ions/ groups bound by the secondary linkages to the metal have charecteristic spatial arrangements
(c) Primary valencies are satisfied by negative ions
(d) None of these

Answer: A

Question. CrCl₃ has primary valence of
(a) 3
(b) 2
(c) 4
(d) 1

Answer: A

Question. When AgNO₃ is added to a solution of Co(NH₃)₅Cl₃, the precipitate of AgCl shows two ionisable chloride ions. This means :
(a) Two chlorine atoms satisfy primary valency and one secondary valency
(b) One chlorine atom satisfies primary as well as secondary valency
(c) Three chlorine atoms satisfy primary valency
(d) Three chlorine atoms satisfy secondary valency

Answer: A

Question. K₄[Fe(CN)₆ ] is a
(a) complex compound
(b) base
(c) double salt
(d) acid

Answer: A

Question. The solution of K₄[Fe(CN)₆] in water will
(a) give a test K⁺
(b) give a test of CN^–
(c) give a test Fe²⁺
(d) None of these

Answer: A

Question. In the coordination compound, K₄[Ni(CN)₄], the oxidation state of nickel is
(a) 0
(b) +2
(c) +1
(d) –1

Answer: A

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

Answer: A

Question. The compound having the lowest oxidation state of iron is
(a) Fe(CO)₅
(b) K₂FeO₄
(c) Fe₂O₃
(d) None of these

Answer: A

Question. Some salts although containing two different metallic elements give test for only one of them in solution. Such salts are
(a) complex
(b) normal salts
(c) double salts
(d) None of these

Answer: A

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

Answer: A

Question. Ligand in a complex salt are
(a) molecules linked by coordinate bonds to a central metal or ion
(b) ions or molecules linked by coordinate bonds to a central atom or ion
(c) cations linked by coordinate bonds to a central metal or ion
(d) anions linked by coordinate bonds to a central metal atom or ion

Answer: A

Question. An example of ambidentate ligand is
(a) Thiocyanato
(b) Aquo
(c) Ammine
(d) Chloro

Answer: A

Question. Which of the following does not form a chelate
(a) Pyridine
(b) EDTA
(c) Ethylenediamine
(d) Oxalate

Answer: A

Question. An ambident ligand is one which
(a) has two donor atoms, but either of two can form a coordinate bond
(b) forms chelate rings
(c) is linked to the metal atom through two donor atoms
(d) None of these

Answer: A

Question. NH₂-NH₂ serves as
(a) Bridging ligand
(b) Monodentate ligand
(c) Chelating ligand
(d) None of these

Answer: A

Question. Which one of the following is NOT a ligand
(a) Na⁺
(b) PH₃
(c) NO⁺
(d) F^–

Answer: A

Question. Which one does not belong to ligand
(a) BF₃
(b) PH₃
(c) NO₊
(d) Cl^–

Answer: A

Question. Which one of the following ligands forms a chelate
(a) Oxalate
(b) Cyanide
(c) Acetate
(d) Ammonia

Answer: A

Question. Choose the correct statement
(a) Coordination number is the number of coordinating sites of all the ligands connected to the central atom or the number of coordinate bonds formed by the metal atom with ligands
(b) Werner’s coordination theory postulates only one type of valency
(c) Coordination number has nothing to do with the number of groups or molecules attached to the central atom
(d) All the above are correct

Answer: A

Question.  O₂ is a
(a) Bidenate ligand
(b) Hexadenate ligand
(c) Monodentate ligand
(d) Tridentate ligand

Answer: A

Question. A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent ?
(a) thiosulphato
(b) glycinato
(c) oxalato
(d) ethane - 1, 2-diamine

Answer: A

Question. Central atoms/ions in coordination compounds are
(a) Lewis acid
(b) Neutral molecules
(c) All of these
(d) Lewis bases

Answer: A

Question.  What is the denticity of the ligand ethylenediaminetetra actetate ion?
(a) 6
(b) 4
(c) 2
(d) 1

Answer: A

Question. The IUPAC name of the coordination compound K₃[Fe(CN)₆ ] is
(a) Potassium hexacyanoferrate (III)
(b) Potassium hexacyanoferrate (II)
(c) Potassium hexacyanoiron (II)
(d) Tripotassium hexacyanoiron (II)

Answer: A

Question. The IUPAC name for the complex [Co(ONO)(NH₃)₅]Cl₂ is
(a) pentaamminenitrito-N-cobalt(III) chloride
(b) pentaamminenitrito-N-cobalt(II) chloride
(c) nitrito-N-pentaamminecobalt(III) chloride
(d) nitrito-N-pentaamminecobalt(II) chloride

Answer: A

Question. The IUPAC name of K₂[PtCl₆] is
(a) potassium hexachloroplatinate (IV)
(b) hexachloroplatinate potassium
(c) potassium hexachloroplatinate
(d) potassium hexachloroplatinum (IV)

Answer: A

Question. IUPAC name of Na₃[Co(ONO)₆] is
(a) Sodium hexanitrito cobaltate (III)
(b) Sodium hexanitrocobalt (III)
(c) Sodium hexanitritocobaltate (II)
(d) Sodium cobaltinitrite

Answer: A

Question. Which of the following coordination compounds would exhibit optical isomerism?
(a) tris-(ethylendiamine) cobalt (III) bromide
(b) trans-dicyanobis (ethylenediamine) chromium (III) chloride
(c) diamminedichloroplatinum(II)
(d) pentamminenitrocobalt(III) iodide

Answer: A

Question. The type of isomerism present in Pentaminenitrochromium (III) chloride is
(a) linkage
(b) polymerisation.
(c) optical
(d) ionisation

Answer: A

Question. Coordination isomerism is caused by the interchange of ligands between the
(a) complex cation and complex anion
(b) inner sphere and outer sphere
(c) low oxidation and higher oxidation states
(d) cis and trans structure

Answer: A

Question. Change in composition of co-ordination sphere yields which type of isomers
(a) ionisation
(b) optical
(c) geometrical
(d) None of these

Answer: A

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

Answer: A

Question. Which one of the following has an optical isomer
(a) [Co(en)₃]³⁺
(b) [Zn(en)₂]²⁺
(c) [Zn(en) (NH₃)₂]²⁺
(d) None of these

Answer: A

Question. The number of geometrical isomers from [Co(NH₃)₃(NO₂)₃] is
(a) 2
(b) 3
(c) 4
(d) 0

Answer: A

Question. The number of isomers exhibited by [Cr(NH₃)₃Cl₃] is
(a) 5
(b) 3
(c) 2
(d) 4

Answer: A

Question. For the square planar complex [M (a) (b) (c) (d)] (where M = central metal and a, b, c and d are monodentate ligands), the number of possible geometrical isomers are
(a) 4
(b) 2
(c) 1
(d) 3

Answer: A