CBSE Questions for Class 12 Engineering Chemistry Coordination Compounds Quiz 8 - MCQExams.com

Choose the correct statement regarding $$SeOCI_2$$ molecule :
  • It does not contain plane of symmetry
  • $$'Cl \hat{Se} Cl'$$ bond angle is greater than $$Cl \hat{Se} O'$$ bond angle
  • Lone pair has greater than $$33.3 \%$$ s-character
  • Central atom used one d-orbital in bonding
Which among the following molecules is not perfect flat?
  • $$B_3N_3H_6$$
  • $$C_3N_3(NH_2)_3$$
  • $$SO_3$$
  • $$C_3N_3(N_3)_3$$
Which of the following molecular species is/are having $$\pi_{2p}$$ as H.O.M.O. (highest occupied molecular orbital):
  • $$N_2^-$$
  • $$O_2^{2+}$$
  • $$NO^+$$
  • $$B^+_2$$
Least stable hybride is :
  • stannane
  • silane
  • plumbane
  • germane
Which of the following isomerism is not possible for complexes having molecular formulae?
(I) $$Pt(SCN)_{2}.3PEt_{3}$$, (II) $$CoBr . SO_{4} . 5NH_{3}$$ (III) $$FeCl_{2} . 6H_{2}O$$.
  • Optical
  • Linkage
  • Ionisation
  • Hydrate
Which of the following will have three stereoisomeric forms?
(i) $$[Cr(NO_{3})_{3}(NH_{3})_{3}]$$
(ii) $$K_{3}[Co(C_{2}O_{4})_{3}]$$
(iii) $$K_{3}[CoCl_{2}(C_{2}O_{4})_{2}]$$
(iv) $$[CoBrCl(en)_{2}]$$
  • (iii) and (iv)
  • (i), (iii) and (iv)
  • (iv) only
  • All four
Which of the following is different among structural isomers?
  • Oxidisation state
  • Co-ordination number
  • IUPAC name
  • None of these
In which of the following complex transition of electron is from one shell to other shell of central metal?
  • $$[Fe(H_{2}O)_{5}(NO)]^{2+}$$
  • $$[Co(H_{2}O)_{6}]^{2+}$$
  • $$[Rh(NH_{3})_{6}]^{2+}$$
  • $$[Ni(CN)_{6}]^{4-}$$
A metal $$M$$ having electronic configuration $$(n - 1)d^{8}ns^{2}$$ forms complexes with co-ordination No. $$= 4$$ and $$6$$, if it forms diamagnetic complexes then permissible oxidation states of metal cation and geometry is
  • $$+2$$, octahedral
  • $$+4$$, octahedral
  • $$+2$$, square planar
  • (b) and (c) both
Which of the following process is/are associated with change of hybridization of the underlined compound?
  • $$\underline {Al(OH)_3}$$ ppt. dissolved in $$NaOH$$
  • $$\underline{B_2H_6}$$ is dissolved in $$THF$$
  • $$\underline{SiF_4}$$ vapour is passed through liq. $$HF$$
  • Solidification $$\underline{PCI_5}$$ vapour
$$[PdCl_{2}(PMe_{3})_{2}]$$ is a diamagnetic complex of $$Pd(II)$$. How many total isomers are possible of analogous paramagnetic complex of $$Ni(II)$$?
  • Zero
  • $$1$$
  • $$2$$
  • $$3$$
Which of the following complex ion is expected to absorb light in $$4000\overset {\circ}{A}$$ to $$7800\overset {\circ}{A}$$ region>
  • $$[Ti(en)_{3}]^{4+}$$
  • $$[Cr(H_{2}O)_{6}]^{3+}$$
  • $$[Sc(NH_{3})_{4}(H_{2}O)_{2}]^{3+}$$
  • $$[Zn(en)_{2}(NH_{3})_{2}]^{2+}$$
If molar conductivity of complex is almost equal to that of $$NaCl$$ and it does not exhibits stereoisomerism then the complex will be
  • $$[Co(CO_{3})(en)_{2}]Br$$
  • $$[Co(CO_{3})(H_{2}O)_{2}(NH_{3})_{2}]Br$$
  • $$[Co(CN)(NH_{3})_{5}]Br_{2}$$
  • $$[Co(CO_{3})(NH_{3})_{4}]Br$$
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
Consider the following isomers
(i) $$[Pt(NH_{3})_{4}Cl_{2}]Br$$
(ii) $$[Pt(NH_{3})_{4}Br_{2}]Cl_{2}$$
(iii) $$[Co(NH_{3})_{4}Cl_{2}]NO_{2}$$

Which of the following observation is correct?
  • (i) will give a pale yellow and (ii) will give a white precipitate with $$AgNO_{3}$$ solution.
  • (iii) will give a white precipitate with $$AgNO_{3}$$ solution
  • (i), (ii) and (iii) will give white precipitate with $$AgNO_{3}$$ solution.
  • None of the above isomers will give white precipitate with $$AgNO_{3}$$ solution.
Types of isomerism exhibited by $$[CrCl_{2}(NO_{2})_{2}(NH_{3})_{2}]^{-}$$ complex ion are
  • Ionisation, optical
  • Hydrate, optical
  • Geometrical, optical
  • Co-ordinate, geometrical
Which of the following will not show geometrical isomerism?
  • $$[Cr(NH_{3})_{4}Cl_{2}]Cl$$
  • $$[Co(en)_{2}Cl_{2}]Cl$$
  • $$[Co(NH_{3})_{5}NO_{2}]Cl_{2}$$
  • $$[Pt(NH_{3})_{2}Cl_{2}]$$
Both geometrical and optical isomerism are shown by 
  • $$[Co(en)_{2}Cl_{2}]^{+}$$
  • $$[Co(NH_{3})_{5}Cl]^{2+}$$
  • $$[Co(NH_{3})_{4}Cl_{2}]^{+}$$
  • $$[Co(ox)_{3}]^{3-}$$
One mole of a complex compound $$Co(NH_{3})_{5}Cl_{3}$$ gives three moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $$AgNO_{3}$$ and yields two moles of $$AgCl{(s)}$$. The complex is:
  • $$[Co(NH_{3})_{4}Cl_{2}]$$$$Cl.NH_{3}$$
  • $$[Co(NH_{3})_{4}Cl]$$$$Cl_{2}.NH_{3}$$
  • $$[Co(NH_{3})_{5}Cl]$$$$Cl_{2}$$
  • $$[Co(NH_{3})_{3}Cl]$$$$Cl_{3}.2NH_{3}$$
Mixture $$[X] = 0.02$$ mole of $$ [Co(NH_3)_5SO_4]Br$$ and 0.02 mol of $$[Co(NH_3)_5Br]SO_4$$ was prepared in 2 litre of solution.
1 litre of mixture [X] + excess $$AgNO_3 \longrightarrow$$ [Y]
1 litre of mixture [X] + excess $$BaCl_2\longrightarrow$$ [Z]
No. of moles of [Y] and [Z] are :
  • $$0.01, 0.01$$
  • $$0.02, 0.01$$
  • $$0.01, 0.02$$
  • $$0.02,0.02$$
The solubility of silver bromide in hypo solution is due to the formation of:
  • $$Ag_{2}SO_{3}$$
  • $$Ag_{2}S_{2}O_{3}$$
  • $$[Ag(S_{2}O_{3})]^{-}$$
  • $$[Ag(S_{2}O_{3})_{2}]^{3-}$$
Which of the following will give maximum number of isomers?
  • $$\left [ Co\left ( NH_{3} \right )_{4} Cl_{2}\right ]$$
  • $$\left [ Ni\left ( en \right )\left ( NH_{3} \right )_{4} \right ]^{2+}$$
  • $$\left [ Ni\left ( C_{2}O_{4} \right )\left ( en \right )_{2} \right ]$$
  • $$\left [ Cr\left ( SCN \right )_{2}\left ( NH_{3} \right )_{4} \right ]^{2+}$$
Which of the following ions is expected to be coloured?
  • $$\left [ Ti\left ( H_{2}O \right )_{6} \right ]^{3+}$$
  • $$\left [ Sc\left ( H_{2}O \right )_{6} \right ]^{3+}$$
  • $$\left [ Zn\left ( H_{2}O \right )_{6} \right ]^{2+}$$
  • $$\left [ Ti\left ( H_{2}O \right )_{6} \right ]^{4+}$$

The observed magnetic moment value $$(\mu _{abs})$$ is higher than calculated magnetic moment value $$(\mu _{cal})$$ for which of the following species?
  • Ti$$^{+3}$$
  • V$$^{+2}$$
  • Co$$^{+2}$$
  • Cr$$^{+2}$$
Match list-I (Cooordination Compounds) with list-II (Type of Isomerism) and select the correct answer using the codes given below :
  List-I  List-II
 A. $$Co(NH_3)_4Cl_2$$ 1. Optical isomerism
 B. $$Cis-Co(en)_3Cl_3$$ 2. Ionization Isomerism
 C. $$Co(en)_2(NH_3)Cl_2SCN$$ 3. Co-ordination Isomerism
 D. $$Co(NH_3)_6Cr(CN)_6$$ 4. Geometrical Isomerism
  • A-4, B-3, C-2, D-1
  • A-1, B-4, C-3, D-2
  • A-4, B-1, C-2, D-3
  • A-4, B-2, C-3, D-1

The slight irregularities in size have been ascribed to:
  • crystal field effects
  • shapes of d orbitals
  • charge transfer
  • splitting of d orbitals
The total number of possible coordination isomers of the complex compound $$\left [ Cu\left ( NH_{3} \right )_{4} \right ]\left [ PtCl_{4} \right ]$$ are:
  • 3
  • 6
  • 2
  • 4
A complex compound of cobalt has molecular formula containing five $$NH_{3}$$ molecules, one $$NO_{2}$$ group and two $$Cl$$ atoms for one $$Co$$ atom. One mole of this compound produces three moles of ions in aqueous solution. On reacting with an excess of $$AgNO_{3}$$ solution, two moles of $$AgCl$$ get precipitated. The ionic formula of the compound is:
  • $$[Co(NH_{3})_{4} NO_{2}Cl]$$ $$ [(NH_{3})Cl]$$
  • $$[Co(NH_{3})_{5} Cl]$$ $$ [Cl (NO_{2})]$$
  • $$[Co (NH_{3})_{5} (NO_{2})] Cl_{2}$$
  • $$[Co(NH_{3})_{5}] [(NO_{2}) Cl_{3}]$$
Which pair is correctly matched?
  • $$[Fe(OH)_3] Fe^{3+} : Cl^{-}$$
  • $$[As_{2}S_{3} ]: As^{3+}$$
  • $$[\mathrm{S}\mathrm{n}\mathrm{O}_{2}]:\mathrm{S}\mathrm{n}\mathrm{O}_{3}^{2-}$$ in acidic medium
  • $$[\mathrm{A}\mathrm{g}\mathrm{I}]:\mathrm{I}^{-}$$ in excess of $$\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}_3$$
Which one of the following has largest number of isomers? ( $$\mathrm{R}=$$ alkyl group, en $$=$$ ethylenediamine) 
  • $$[\mathrm{R}\mathrm{u}(\mathrm{N}\mathrm{H}_{3})_{4}\mathrm{C}1_{2}]^{+}$$
  • $$[\mathrm{C}\mathrm{o}(\mathrm{N}\mathrm{H}_{3})_{5}\mathrm{C}1]^{2+}$$
  • $$[\mathrm{I}\mathrm{r}(\mathrm{P}\mathrm{R}_{3})_{2}\mathrm{H}(\mathrm{C}\mathrm{O})]^{2+}$$
  • $$[\mathrm{C}\mathrm{o}(\mathrm{e}\mathrm{n})_{2}\mathrm{C}1_{2}]^{+}$$
The correct statement in respect of protein haemoglobin is that it :-
  • Maintains blood sugar level
  • Acts as an oxygen carrier in the blood
  • Forms antibodies and offers resistance to diseases
  • Functions as a catalyst for biological reactions
In which of the following coordination entities the magnitude of $$\Delta _{0}$$ (CFSE in the octahedral field) will be maximum? (Atomic number of $$Co=27$$)
  • $$[Co(CN)_{6}]^{3-}$$
  • $$[Co(C_{2}O_{4})_{3}]^{3-}$$
  • $$[Co(H_{2}O)_{6}]^{3+}$$
  • $$[Co(NH_{3})_{6}]^{3+}$$

Which one of the following has largest number of stereoisomers?
  • $$[Ru(NH_{3})_{4}Cl_{2}]^{+}$$
  • $$[Co(NH_{3})_{5}Cl]^{2+}$$
  • $$[Ir(PR_{3})_{2}H(CO)]^{2+}$$
  • $$[Co(en)_{2}Cl_{2}]^{+}$$
The pair(s) of coordination complexes/ions exhibiting the same kind of isomerism is(are):
  • $$[Cr(NH_{3})_{5}Cl]Cl_{2}$$and $$[Cr(NH_{3})_{4}Cl_{2}]Cl$$
  • $$[Co(NH_{3})_{4}Cl_{2}]^{+}$$ and $$[Pt(NH_{3})_{2}(H_{2}O)Cl]^{+}$$
  • $$[CoBr_{2}Cl_{2}]^{2-}$$ and $$[PtBr_{2}Cl_{2}]^{2-}$$
  • $$[Pt(NH_{3})_{3}(NO_{3})] Cl$$ and $$[Pt(NH_{3})_{3}Cl]Br$$
The ratio of pure and hybrid orbitals of valence shell in $$H_{2}C=CH-CH=CH_{2}$$ is:
  • $$7 : 12$$
  • $$14 : 13$$
  • $$6 : 5$$
  • $$5 : 6$$
In the analysis of an organic compound, it was found that it contains 7 carbon atoms, there are two C = C bonds and one $$C\equiv C$$ bond. This compound is a hydrocarbon. Hydrocarbons have only carbon and hydrogen elements. On structural analysis it was found that it is covalent in nature and expected structure is given above. The ratio between the pure and hybrid orbitals is?

25634_710955a49cc441a68370bc918dcbf84c.png
  • $$7:10$$
  • $$8:7$$
  • $$5:9$$
  • $$1:2$$

Match the correct pairs of isomers with their examples.

A)Ionisation                           (a) $$Pt(NH_{3})_{2}Cl_{2}][Pt(NH_{3})_{4}]$$

$$[PtCl_{4}]$$

B) Linkage                              (b) $$[Cr(NH_{3})_{6}][Co(CN)_{6}]$$ & $$[Co(NH_{3})_{6}[Cr(CN)_{6}]$$

C)Coordination                       (c) $$[Co(NH_{3})_{5}(NO_{2})]Cl_{2}$$ & $$[Co(NH_{3})_{5}(ONO)]Cl_{2}$$

D)Polymerisation                    (d) $$[Co(SO_{4})(NH_{3})_{5}]Br$$ & $$[Co(Br (NH_{3})_{5}]SO_{4}$$
  • A -> a, B -> b, C -> c, D -> d
  • A -> b, B -> a, C -> d, D -> c
  • A -> d, B -> c, C -> b, D -> a
  • A -> d, B -> b, C -> c, D -> a
Which of the following statements is incorrect?
  • Complex $$[Co(NH_3)_4(H_2O)Cl]Br_2$$ can show both hydrate as well as ionization isomerism
  • Complex $$[Co(NH_3)_5(H_2O)](NO_3)_3$$ can show hydrate isomerism
  • Complex $$[Pt(NH_3)_4][PtCl_6]$$ cannot show coordination isomerism
  • $$[Co(NH_3)_4(NO_2)Cl]Cl$$ can show both ionization as well as linkage isomerism
In which of the following complexes more than one type of structural isomerism is possible?
  • $$[Co(NH_{3})_{5} (NO_{2})]Cl$$
  • $$[Co(NH_{3})_{5}(H_{2}O)](NO_{2})_{3}$$
  • $$[Pt(NH_{3})_{4}][Pt(SCN)_{4}]$$
  • $$ [Cr(DMG)_{3}]$$
The total number of isomers shown by $$[Co(NH_3)_4(NO_2)_2](NO_3)$$ complex is:
  • 10
  • 6
  • 4
  • 12
$$[Fe(H_2O)_4(CN)_2]$$ is the empirical formula of a compound which has a magnetic moment corresponding to $$2\frac{2}{3}$$ unpaired electrons per iron. The best possible formula of the compound is
  • $$[Fe(H_2O)_6]2[Fe(CN)_6]$$
  • $$[Fe(H_2O_6)][Fe(H_2O)_2(CN)_4]
    $$
  • $$[Fe(H_2O)_4(CN)_2]_2[Fe(H_2O)_4(CN)_2]$$
  • None of these
Match column-I (chemical composition of precipitates) with column-II (colour of the precipitate) and select the correct answer using the codes given below in the columns :
(a) $$Co [Hg (SCN)_4]$$         (p) black
(b) $$Fe_3[Fe(CN)_6]_2$$         (q) rosy red
(c) $$Ni(dmg)_2$$                   (r) prussian blue
(d) PbS                             (s) deep blue
  • a-s , b-p , c-q , d-r
  • a-s , b-r , c-q , d-p
  • a-s , b-p , c-r , d-q
  • a-p , b-r , c-q , d-s
  • a-p , b-q , c-r , d-s
$$ K: K_4[Mn(CN)_6], \\L: K_3[Co(NO_2)_6], \\ M: [Co(H_2O)_6]Cl_3, \\ N:[Cr(CO)_6], \\ O:[Ni(en)_3](NO_3)_3 $$
$$P:[Pt(NH_3)_2Cl_2]$$
The diamagnetic complexes are :
  • L, M, N, P
  • K, L, N, O
  • L, M, O, P
  • K, N, O, P
Which one of the following complexes is not expected to exhibit isomerism?
  • $$[Pt(NH_3)_2Cl_2]$$
  • $$[Ni(NH_3)_2Cl_2]$$
  • $$[Ni(en)_3]^{2+}$$
  • $$[Ni(NH_3)_4(H_2O)_2]^{2+}$$
Which of the following orbitals can not undergo hybridisation amongst themselves?
$$(I)\ 3d, 4s$$ 
$$(II)\ 3d, 4d$$ 
$$(III)\ 3d, 4s$$ & $$4p $$ 
$$(IV) \ 3s, 3p$$ & $$4s$$
  • $$II$$
  • $$II$$ and $$III$$
  • $$I, II$$ and $$IV$$
  • $$II$$ and $$IV$$
Coordination number of Ni in $$[Ni(C_2O_4)_3]^{4-}$$ is:
  • 3
  • 6
  • 4
  • 2
Which of the following are paramagnetic?
  • $$[Ni(CN)_4]^{2-}$$
  • $$[NiCl_4]^{2-}$$
  • $$[CoF_6]^{3-}$$
  • $$[Co(NH_3)_6]^{3+}$$
For the dark green compound, $$ CrCl_6H_2O$$, which of the following is correct?
  • all the $$Cl$$ shows primary valency (PV).
  • two $$Cl$$ shows primary valency (PV) and one $$Cl$$ secondary valency (SV).
  • two $$Cl$$ shows primary valency (PV) and one $$Cl$$ (PV) as well as secondary valency (SV).
  • all the Cl show secondary valency (SV).
Which of the following statement is true for the complex, $$[Co(NH_3)_4Br_2]NO_2?$$
  • It shows ionisation, linkages and geometrical isomerism.
  • It does not show optical isomerism because its cis and trans forms each have at least one plane of symmetry.
  • Its ionisation isomers cannot be differentiated by silver nitrate solution.
  • (A) and (B) both.
Primary and secondary valency of $$Pt$$ in $$[Pt(en)_2Cl_2]Cl_2$$ are:
  • 2, 4
  • 2, 6
  • 6, 6
  • 4, 2
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