Chemistry Chapter 12 Entry Test MCQs
76. The oxidation state of Cu in [Cu(NH3)4]SO4 is:
a. 0
b. +1
c. +4
d. +2
77. The oxidation number of Ni in [Ni(CO)4]:
a. +2
b. +4
c. 0
d. +1
78. Coordination number and oxidation state of platinum in [PtCl(NO2)(NH3)4]SO4 are
a. 6, VI
b. 4, II
c. 4, IV
d. 6, IV
79. The coordination No. of Iron in [Fe(C2O4)3] is.
a. 4
b. 2
c. 0
d. 6
80. In which of the following complex the metal exhibit highest oxidation state:
a. [Ni(CO)4]
b. [Cu(NH3)6]SO4
c. [Pt(NH3)2Cl2]SO4
d. K3[Fe(CN)6]
81. The number of electron pairs received by central metal atom in complexes is the coordination number of central metal atom. In this complex [Co(C2O4)3] has coordination number equal to:
a. 4
b. 2
c. 0
d. 6
82. In transition elements the complexes are coloured due to the transition of unpaired electrons in the complex between eg and t2g states. The transition metal which does not have this capability and has colourless compounds is:
a. Co
b. Ni
c. Zn
d. Mn
83. Oxidation number of cobalt in the complex ion Na[Co(NH3)2Cl4]is _.
a. –2
b. –1
c. +3
d. +2
84. Primary valency of K2[Zn(OH)4] is
a. 1
b. 4
c. 3
d. 2
85. Among the following which are ambidentate ligands? (I) SCN– (II) NO3– (III) NO2– (IV) C2O42-
a. (ii) and (iii)
b. (i) and (iii)
c. (ii) and (iv)
d. (i) and (iv)
86. The charges x and y on the following ions are, (I) [Co(NH3)2Cl4]x (II) [Fe(CN)6]y
(Oxidation state of Co is +3 and Fe is +2 in their respective complexes.)
a. x = -1, y = -4
b. x = +1, y = -1
c. x = -2, y = -3
d. x = -1, y = +3
87. Identify the statement which is not correct.
a. A ligand donates at least one electron pair to the metal atom to form a bond.
b. Coordination compounds are mainly known for transition metals.
c. [Co(NH3)4Cl2]+ is a complex.
d. Coordination number and oxidation state of metal are the same.
88. A coordination complex’s core atom/ion is also known as __
a. Lewis acid
b. Lewis base
c. Bronsted-Lowry base
d. Bronsted-Lowry acid
89. Ammonia acts as a very good ligand but ammonium ion does not form complexes because
a. NH4+ ion does not have any lone pair of electrons
b. NH3 is a gas while NH+4 is in liquid form.
c. NH4+ ion has one unpaired electron while NH3 has two unpaired electrons
d. NH3 undergoes sp3 hybridization while NH4+ undergoes sp3d hybridisation
Nomenclature of Complex compounds
90. IUPAC name of [Pt(NH3)2Cl(NO2)] is
a. Chloronitrito-N-ammineplatinum (II)
b. Platinum diamminechloronitrite
c. Diamminechloronitrito-N-plantinate (II)
d. Diamminechloronitritoplatinum (II)
91. The formula of Tetraaminechloronitro-platinum(IV)sulphate is:
a. [Pt(NO2)(NH3)4Cℓ]SO4
b. [PtCℓ(NH3)4(NO2)]SO4
c. [PtCℓ(NO2)(NH3)4]SO4
d. All are correct
92. The name of Na4[Fe(CN)6] according to IUPAC system is:
a. Sodium hexacyano Iron(III)
b. Tetrasodium hexacyano ferrate(II)
c. Sodium hexacyano Iron(II)
d. Sodium hexacyano ferrate(II)
93. The name of complex [CoBr2(en)2]Cl:
a. Dibromo bis (ethylene diamine) cobalt (I) chloride
b. Bis (ethylene diamine) dibromo cobalt III chloride
c. Dibromo bis (ethylene diamine) cobalt (II) chloride
d. Dibromo bis (ethylene diamine) cobalt III chloride
Geometry + Hybridization of Complex compounds
94. Hybridization of [Ni (CO)4] is
a. sp3d
b. Sp3
c. sp2
d. d2sp3
95. In octahedral complexes the central metal atom is ________hybridized:
a. dsp2
b. sp3
c. d2sp3
d. dsp3
96. [Cu(NH3)4]+2 shows one of the following geometry:
a. Square planer
b. Octahedral
c. Trigonal-
d. Tetrahedral
97. The geometry of [Fe(NH3)6]Cl2 is:
a. Tetrahedral
b. Square planner
c. Trigonal pyramidal
d. Octahedral
98. Which of the following has square planner structure?
a. [Ni(CN)4]-2
b. [Ni(Cl)4]
c. [FeCN6]-4
d. [Ni(CO)5]-2
Isomerism of Complex compounds
99. The type of isomerism shown by the complex [CoCl2(en)2] is
a. Coordination isomerism
b. Geometrical isomerism
c. Ionization isomerism
d. Linkage isomerism
100. The type of isomerism present in pentaamine nitro chromium (III) chloride is:
a. Optical isomerism
b. Ligand isomerism
c. Hydration isomerism
d. Linkage isomerism
101. Which of the following compounds does not have a coordination isomer?
a. [Cr(NH3)6][Co(CN)6]
b. [Ag(NH3)2][Ag(CN)2]
c. [Cu(NH3)4][FeCl4]
d. [Zn(NH3)4][PtCl4]
102. Excahange of co-ordination group by a water molecule results in.
a. Ligand isomerism
b. Ionization isomerism
c. stereoisomerism
d. Hydration isomerism
103. The type of isomerism shown by [Co(en)2(NCS)2]Cl and [Co(en)2(NCS)Cl]NCS is:
a. Ligand isomerism
b. Ionization isomerism
c. stereoisomerism
d. Hydration isomerism