CBSE Questions for Class 12 Engineering Chemistry Coordination Compounds Quiz 9 - MCQExams.com

In an octahedral complex, if ligands on one axis are displaced little away from their ideal positions, the crystal field splitting of d-orbitals for this complex is as given below
$$d_{x^2-y^2} d_{z^2} d_{xy} d_{yz} d_{xz}$$
The ligands are displaced on which axis/ axes :
  • x- and y
  • y-only
  • x-only
  • z-only

Consider Crystal field theory and state which of the following statements is incorrect?
114716.png
  • The $$Ni^{2+}(aq)$$ cation is coloured because $$Ni^{2+}$$ ion can absorb light, which promotes electrons from the filled d-orbitals to the higher energy half filled d-orbitals.
  • The $$Zn^{2+}(aq)$$ cation is colourless because the d-orbitals are completely filled and no electrons can be promoted, so on light is absorbed.
  • A complex which has just one absorption band at 455 nm, must be red coloured.
  • A complex which has just one absorption band at 425 nm, must be yellow coloured.
Consider the following statements and arrange in the order of true/ false as given in the codes.
$$S_1$$: Both $$[Co(ox)_3]^{3-}$$ and $$[CoF_6]^{3-}$$ are paramagnetic.
$$S_2: CoCl_33NH_3$$ complex is non-conducting.
$$S_3$$: The number of possible isomers for the complex $$[Pt(NO_2)(py)(OH)(NH_3)]$$ is six.
$$S_4$$: The oxidation state of iron in brown ring complex $$[Fe(H_2O)_5NO^+]SO_4$$ + II where NO is $$NO^+$$.
  • F T T T
  • T T T T
  • F T T F
  • T T T F
The $$[Ti(NCS)_6]^{3-}$$ ion exhibits a single absorption band at 544 nm. What will be the crystal field splitting energy $$(in kJ mol^{-1})$$ of the complex? $$(h=6.626\times 10^{-34}J.s; C=3.0\times 10^8 m/s; N_A=6.02\times 10^{23} ions/mole$$.
114716.png
  • 240
  • 220
  • 270
  • 250
Isomerisms exhibited by $$[Cr(NH_3)_2(H_2O)_2Cl_2]^+$$ are:
  • ionisation, optical
  • hydrate, optical
  • geometrical, optical
  • coordinate, geometrical
The Alsatian-Swiss chemist Alfred Werner pioneered the field of coordination chemistry in the late nineteenth century. At that time, a number of compounds of cobalt (III) chloride with ammonia were known, with general formula $$CoCl_3.xNH_3$$ $$x=3\ to\ 6$$
Treatment of these compounds with aqueous HCl acid did not remove the ammonia. However, treatment of the compounds with excess of $$AgNO_3$$ at 273 K gave white precipitate of AgCl in varying ratio depending on the structure. Also each complex had electrical conductivity of varying nature.
 
There is no reaction of the compound with aqueous HCl indicating that there is no free $$NH_3$$. Thus, $$NH_3$$ ligand is bonded to cobalt(III) by________ .
  • Primary valency.
  • Secondary valency.
  • Both of these.
  • None of these.
The magnitude of crystal field stabilization energy in octahedral field depends on
I : the nature of the ligand
II : the charge on the metal ion
III : whether the metal is in the first, second or third row of the transition elements
  • I, II, III
  • I, II 
  • II, III 
  • III only 
Coordination compounds have great importance in biological systems. In this context which of the following statement(s) is/are incorrect?
  • Chlorophyll is a green pigment in plants and contains calcium
  • Haemoglobin is the red pigment of blood and contains iron
  • Cyanocobalamin is $$\displaystyle B_{12}$$ and contains cobalt
  • Carboxypeptidase A is an enzyme and contains zinc
Which is/are correct statement(s)?
  • $$[Co(en)_3][Cr(CN)_6]$$ will display coordination isomerism
  • $$[Mn(CO)_5(SCN)]$$ will display linkage isomerism
  • $$[Co(NH)_3)_5(NO_3)]SO_4$$ will display ionisation isomerism
  • None of the above
Which of the following statement(s) is/are not correct?
  • Hybridization is the separation of atomic orbitals.
  • $$sp^{2}-$$ hybrid orbitals are formed form two p- atomic orbitals and one s- atomic orbitals.
  • $$dsp^{2}-$$ hybrid orbitals are at $$\displaystyle\:90^{\circ}$$ to one another.
  • $$d^{2}sp^{3}-$$ hybrid orbitals are directed towards the corners of a regular octahedron.
How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with $$ Ca^{2+} $$?
  • six
  • three
  • one
  • two
Which one of the following complexes will have four different isomers?
  • $$[Co(en)_2Cl_2]Br$$
  • $$[Co(en)(NH_3)_2Cl_2]Cl$$
  • $$[Co(PPh_3)_2(NH_3)Cl]Cl$$
  • $$[Co(en)_3]Cl_3$$
The IUPAC name for the complex $$\displaystyle \left [ Co\left ( NH_{3} \right )_{5}\left ( NO_{2} \right ) \right ]Cl_{2}$$ is:
  • Nitrito $$\displaystyle -$$ N $$\displaystyle -$$ pentaammine cobalt ( III ) chloride.
  • Nitrito $$\displaystyle -$$ N $$\displaystyle -$$ pentaammine cobalt ( II ) chloride.
  • Pentaammine nitrito $$\displaystyle -$$ N $$\displaystyle -$$ cobalt ( II ) chloride.
  • Pentaammine nitrito $$\displaystyle -$$ N $$\displaystyle -$$ cobalt ( III ) chloride.
The degeneracy of $$d-orbitals$$ is lost under:
(I) Strong field ligand (II) Weak field ligand (III) Mixed field ligand (IV) Chelated ligand field
Choose the correct code.
  • I, II and IV
  • I and II
  • I, II, III and IV
  • I, II and III
Which of the following orbitals can not undergo hybridisation amongst themselves?
(I) $$3d$$, $$4s$$
(II) $$3d$$, $$4d$$
(III) $$3d$$, $$4s$$ and $$4p$$
(IV) $$3s$$, $$3p$$ and $$4s$$
  • only II
  • II and III
  • I, II and IV
  • II and IV
$$\displaystyle \left [ Pt\left ( NH_{3} \right )\left ( NH_{2}OH \right )\left ( py \right )\left ( NO_{2} \right ) \right ]NO_{3}$$ has square planar shape and has three geometrical isomer.
  • True
  • False
Which of the following statement(s) is/are incorrect?
  • In $$\displaystyle \:\left [ CoBrCl\left ( en \right )_{2} \right ]^{+}$$, geometrical isomerism exists while optical isomerism does not exist.
  • Potassium aquadicyanidosuperoxidoperoxidochromate(III) is IUPAC name for $$K_{2}[Cr(CN)_{2}(O_{2}O_2)( H_{2}O)]$$.
  • There are 3 geometrical isomers and 15 stereoisomers possible for $$\displaystyle K_{2}\left [ Cr\left ( CN \right )_{2}\left ( O_{2}O_2 \right )\left ( H_{2}O \right ) \right ]$$.
  • Cis and trans forms are not stereoisomers of each other.
Which of the following statements regarding Werner's theory are true?
$$( 1 )$$ Ligands are connected to the metal ions by covalent bonds.
$$( 2 )$$ Secondary valencies have directional properties.
$$( 3 )$$ Secondary valencies are non- ionizable.
  • 1, 2 and 3 are correct
  • 2 and 3 are correct
  • 1 and 3 are correct
  • 1 and 2 are correct
Which of the following statement is not correct about C.F.T.?
  • Diamagnetic metal ions cannot have an odd number of electrons.
  • In an octahedral crystal field, the $$d-$$electrons of a metal ion occupy the $$\displaystyle e_{g}$$ set of orbitals before they occupy the $$\displaystyle t_{2g}$$ set of orbitals.
  • Low spin complex may be paramagnetic.
  • In high spin octahedral complex, $$\displaystyle \Delta _{0}$$ is less than the electron pairing energy and is relatively very small.
Which one of the following pairs of isomers and types of isomerism are correctly matched?
(i) $$[Co(NH_{3})_{5}(NO_{2})]Cl_{2}$$ and $$[Co(NH_{3})_{5}(ONO)Cl_{2} ... (Linkage)$$
(ii) $$[Cu(NH_{3})_{4}][PtCl_{4}]$$ and $$[Pt(NH_{3})_{4}][CuCl_{4}] ... (Coordination)$$
(iii) $$[PtCl_{2}(NH_{3})_{4}]Br_{2}$$ and $$[PtBr_{2}(NH_{3})_{4}]Cl_{2} ... (Ionization)$$
Select the correct answer using the codes given below:
  • (ii) and (iii)
  • (i), (ii) and (iii)
  • (i) and (iii)
  • (i) and (ii)
Consider the following isomerism:
(i) Ionization (ii) Hydrate (iii) Coordination (iv) Geometrical (v) Optical
Which of the above isomerisms are exhibited by $$[Cr(NH_{3})_{2}(OH)_{2}Cl_{2}]^{-}$$?
  • (i) and (v)
  • (ii) and (iii)
  • (iii), (ii) and (i)
  • (iv) and (v)
Match List-I with List-II and select the correct answer using the codes given below:
List IList II
(I) $$[FeF_{6}]^{3-}$$(A) $$1.73\ BM$$
(II) $$[Ti(H_{2}O)_{6}]^{3+}$$(B) $$5.93\ BM$$
(III) $$[Cr(NH_{3})_{6}]^{3+}$$(C) $$0.00\ BM$$
(IV) $$[Ni(H_{2}O)_{6}]^{2+}$$(D) $$2.83\ BM$$
(V) $$[Fe(CN)_{6}]^{4-}$$(E) $$3.88\ BM$$
  • $$B A C D E$$
  • $$B A E D C$$
  • $$B C D E A$$
  • $$D E A B C$$
Which of the following statement is true?
  • In $$[PtCl_2(NH_3)_2]^{2+}$$ the cis form is optically inactive while trans form is optically active
  • In $$[Fe(C_2O_4)_3]^{3-}$$, geometrical isomerism does not exist while optical isomerism exists
  • In Mabcd, square planar complexes show both optical as well as geometrical isomerism
  • In Mabcd tetrahedral complex, optical isomerism cannot be observed
At S.T.P. the density of $$CCl_4$$ vapours in g/L will be nearest to :
  • 6.87
  • 3.42
  • 10.26
  • 4.57
Which of the following will have two stereoisomeric forms?
(I) $$[Cr(NO_{3})_{3}(NH_{3})_{3}]$$ (II) $$K_{3}[Fe(C_{2}O_{4})_{3}]$$ (III) $$[CoCl_{2}(en)_{2}]^{+}$$ (IV) $$[CoBrCl(ox)_{2}]^{3-}$$.
  • I only
  • I and II
  • III and IV
  • All of these
Complex compound $$[Cr(NCS)(NH_3)_5][ZnCl_4]$$ will be :
  • colourless and diamagnetic.
  • green coloured and shows coordination isomerism.
  • green coloured and shows linkage as well as coordiantion isomerism.
  • diamagnetic and shows linkage isomerism.
The most stable complex species is:
  • $$[Fe(C_2O_4)_3]^{3-}$$
  • $$[Fe(CN)_6]^{3-}$$
  • $$[Fe(CN)_6]^{4-}$$
  • $$[Fe(H_2O)_6]^{3+}$$
Select the correct code about complex $$[Cr(NO_{2})(NH_{3})_{5}][ZnCl_{4}]$$:
(I) IUPAC name of compound is pentaamminenitrito-N-chromium (III) tetrachlorozincate(II)
(II) It shows geometrical isomerism
(III) It shows linkage isomerism
(IV) It shows coordination isomerism.
  • III, IV
  • I, III and IV
  • II, III and IV
  • I, II, III and IV
What is electronic arrangement of metal atom/ ion in octahedral complex with $$d^{4}$$ configuration, if $$\triangle_{0} <$$ pairing energy?
  • $$t_{2g}^{4}e_{g}^{0}$$
  • $$e_{g}^{4}t_{2g}^{0}$$
  • $$t_{2g}^{3}e_{g}^{1}$$
  • $$e_{g}^{2}t_{2g}^{2}$$

Maximum number of electrons in a subshell with l = 3 and n = 4 is :
  • 14
  • 16
  • 10
  • 12
Which of the following is correct about Tetraamminedithiocyanato-s cobalt(III) tris(oxalato)cobaltate (III)?
  • Formula of complex is $$[Co(SCN)_{2}(NH_{3})_{4}][Co(ox)_{3}]$$
  • It is a chelating complex and show linkage isomerism
  • It show optical isomerism
  • It show geometrical isomerism
The number of complexes that can be can be made with varying $$NH_3$$ ligands to satisfy primary and secondary valencies of platinum are:

Complex; [$$PtCl_4\cdot xNH_3$$]   
  • 5
  • 3
  • 4
  • 2
Select correct statement(s).
  • Nickel (II) compounds tend to be thermodynamically more stable than platinum (II)
  • Platinum (IV) compounds are relatively more stable than nickel (IV) compounds
  • $$K_2Pt^{IV}Cl_6$$ exists
  • $$K_2Ni^{IV}Cl_6$$ exists
Orange is the complimentary colour of blue spectral colour.
  • True
  • False
Which is right combination?

(a) Hydrate isomerism-$$[Co(H_2O)_3Cl_3]3H_2O$$ and $$[Co(H_2O)_6]Cl_3$$

(b) Ionisation isomerism-$$[Co(NH_3)_5Br]SO_4$$ and $$[Co(NH_3)_5SO_4]Br$$

(c) Geometrical isomerism-$$MCl_2Br_2$$ 
  • a and b
  • b and c
  • a and c
  • a , b and c
In complexes of weak field ligands, $$\Delta_o < P$$ (pairing energy), the energy difference between $$t_{2g}$$ and $$e_g$$ sets is relatively less. Under the influence of strong field ligands, $$\Delta_o > P$$ (pairing energy), the energy difference between $$t_{2g}$$ and $$e_g$$ sets is relatively high.
The correct statement regarding $$[Cr(en)_2Cl_2]^+$$ and $$[Co(C_2O_4)_2(NH_3)_2]^-$$ complex ions is :
  • both are equally stable complexes
  • both have equal number of stereoisomers
  • both are diamagnetic complexes
  • none of the above
The d-orbitals, which are stabilized in an octahedral magnetic field, are :

146884_8fe697b36d8c4f879c607c47c20b6b41.png
  • $$d_{xy}$$ and $$d_{z^2}$$
  • $$d_{x^2-y^2}$$ and $$d_{z^2}$$
  • $$d_{xy}, d_{xz}$$ and $$d_{yz}$$
  • $$d_{x^2}$$ only
Both geometrical and optical isomerisms are not shown by : 
  • Dichlorobis (ethylenediamine) cobalt (III) ion
  • Triamminetrichloro cobalt (III) ion
  • Tetraamminedichloro cobalt (III) ion
  • Trioxalatochromate (III) ion
Which of the following statement(s) is/are correct?
  • Primary valency of the central metal of a complex is always satisfied by anions.
  • Secondary valency of the central metal of a complex may be satisfied by either negative ions or neutral molecules.
  • Species which show primary valencies in a complex compound can be precipitated out.
  • None of the above
Choose the correct statement regarding the complexes X and Y:
(I)   Both complexes have the same six geometrical isomers.
(II)  Both complexes have nearly the same conductivity in $$H_2O$$.
(III) In both complexes, $$NH_3$$ is involved only to secondary valency.
(IV) In both complexes, electronic configuration of $$t_{2g}$$ is same.
  • I, II, and III
  • I, II, III, and IV
  • II, III, and IV
  • I, III, and IV
Which of the following gives the maximum number of isomers ?
  • $$[Co(NH_3)_4Cl_2]$$
  • $$[Ni(en)(NH_3)_4]^{2+}$$
  • $$[Ni(C_2O_4)(en)_2]$$
  • $$[Cr(SCN)_2(NH_3)_4]^+$$
Which chromium compound in widely used in training of leather?
  • $${Cr}_{2}{O}_{3}$$
  • $$Cr{O}_{2}{Cl}_{2}$$
  • $$Cr{Cl}_{3}$$
  • $${K}_{2}{SO}_{4}.{Cr}_{2}{({SO}_{4})_{3}}.24{H}_{2}O$$
The total number of possible coordination isomer for the given compound $$[Pt(NH_3)_4Cl_2][PtCl_4]$$ is:
  • 2
  • 4
  • 5
  • 3
$$[Cr(H_2O)_6]Cl_3$$  (atomic number of $$Cr=24$$) had a magnetic moment of $$3.83\ B.M.$$ The correct distribution of $$3d$$electrons in the chromium present in the complex is :
  • $$3d^1_{xy}, 3d^1_{yz}, 3d^1_{zx}$$
  • $$3d^1_{xy}, 3d^1_{yz}, 3d^1_{z^2}$$
  • $$3d^1_{(x^2-y^2)}, 3d^1_{z^2}, 3d^1_{zx}$$
  • $$3d^1_{xy}, 3d^1_{x^2-y^2}, 3d^1_{xz}$$
The complexes [CoNO$$_2$$(NH$$_3$$)$$_5$$]Cl$$_2$$ and [Co(ONO)(NH$$_3$$)$$_5$$]Cl$$_2$$ are not the example of : 
  • Geometrical isomers
  • Optical isomers
  • Coordination isomers
  • Linkage isomers
Potassium ferrocyanide is stored in dark coloured bottles and kept away from sunlight because:
  • undergoes displacement in sunlight
  • dark colors of the bottles absorb a lot of energy from light
  • undergoes decomposition in sunlight
  • evaporates in sunlight
When $$AgNO_3$$ is added to a solution of $$Co(NH_3)_5 Cl_3$$, the precipitate of $$AgCl$$ shows two ionized chloride ions. This means:
  • only two chlorine atoms satisfy primary valency and one secondary valency
  • one chlorine atom satisfies primary as well as secondary valency
  • two chlorine atoms satisfy primary valency
  • three chlorine atoms satisfy secondary valency
The complexes [Cr(NH$$_3$$)$$_6$$] [Co(CN)$$_6$$] and [Co(NH$$_3$$)$$_6$$] [Cr(CN)$$_6$$] are not the examples of :
  • Geometrical isomers
  • Optical isomers
  • Coordination isomers
  • Linkage isomers
The number of total possible stereoisomers for [Pd(NH$$_2$$ - CH(CH$$_3$$) - CO$$_2^{-}$$)$$_2$$]$$^0$$ is?
  • 10
  • 4
  • 8
  • 6
The total number of possible isomer for the complex compound : $$[Cu(NH_3)_4] [PtCl_4]$$
  • 3
  • 6
  • 5
  • 4
0:0:1


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