CHEMICAL BONDING AND MOLECULAR STRUCTURE – 5

1) Clathrates are compounds obtained from noble gases and
a) Water
b) Quinol
c) Phenol
d) All the above

2) Which of the following is present in an electric discharge tube containing helium ?
a)
b)
c)
d) All the above

3) The complete hydrolysis of XeF2 gives
a) Xe
b)
c) HF
d) All the above

4) Which one of the following statements is incorrect about transition elements?
a) The last electron enters into them in the d-orbital
b) Their properties are in between those of s-block and p-block elements
c) The transition element with the smallest atomic number is scandium
d) Lanthanum is not a transition element but is a lanthanide

5) Which one of the following constitutes a set of transition elements?
a) Sn, Bi, Mn
b) Hg, Pb, Cu
c) Pt, Cd, Sb
d) Fe, Au, Ni

6) The number of transition series is
a) 2
b) 3
c) 4
d) 5

7) Which one of the following belongs to the 3rd transition series?
a) Ni
b) Ac
c) Cd
d) Au

8) The triad consisting of ferrous metals is
a) Fe, Ni, Mn
b) Fe, Pt, Au
c) Fe, Cu, Ag
d) Fe, Co, Ni

9) Platinum and gold are called noble metals because
a) They were discovered by Alfred Nobel
b) They have shining surfaces and are used for making ornaments
c) They are found in the native state
d) They almost do not react with other chemicals

10) Manganese belongs to the
a) p block
b) First transition series
c) Second transition series
d) Third transition series

11) The electronic configuration of Cu2+ (Atomic number of Cu = 29) is
a)
b)
c)
d)

12) The element with the electronic configuration[Xe]54 4f14 5d2 6s2 belongs to the
a) s-Block
b) p-Block
c) d-Block
d) f-Block

13) [Ti(H2O)6]3+ is purple in colour because it is the complementary colour of
a) Blue
b) Red
c) Green
d) (Greenish) Yellow

14) The element with the electronic configuration[Xe]544f145d1 6s2 is a
a) Representative element
b) Transition element
c) Lanthanide
d) Actinide

15) In the transition elements, the incoming electron occupies the (n — 1) d-orbital in preference to
a) np
b) ns
c) (n – 1)p
d) (n – 1)s

16) Zn2+ ion is isoelectronic with
a)
b)
c)
d)

17) The maximum oxidation state exhibited by manganese (At. No. 25) is
a) +3
b) +4
c) +6
d) +7

18) The tendency to form complexes is maximum for
a) Normal elements
b) Transition elements
c) Inner-transition elements
d) Metals containing fully filled d-orbitals

19) Transition elements have the maximum tendency to form complexes because
a) They are metals and all metals form complexes
b) They contain incompletely filled d-orbitals
c) Their charge/size ratio is quite large
d) Both (b) and (c)

20) A complex in which dsp2 hybridization takes place is
a) Square planar
b) Tetrahedral
c) Triangular planar
d) Pyramidal

21) CuSO4 .5 H2O is blue in colour because
a) It contains water of crystallization
b)
c)
d)

22) Transition metals have the electronic configuration (n – 1) d1-10 ns1-2. The d orbitals are degenerate. The colour of the transition metal ions is due to the absorption of some wavelength. This results in
a) d-s Transition
b) s-d Transition
c) s-s Transition
d) d-d Transition

23) Which one of the following ions is coloured?
a)
b)
c)
d)

24) Which one of the following transition metal ions is diamagnetic?
a)
b)
c)
d)

25) In a transition series, as the atomic number increases, paramagnetism
a) Increases gradually
b) Decreases gradually
c) First increases to a maximum and then decreases
d) First decreases to a minimum and then increases

26) Which one of the following transition metal ions is paramagnetic?
a)
b)
c)
d)

27) The transition metal ion with the least magnetic moment will be one with the configuration
a)
b)
c)
d)

28) If n is the number of unpaired electrons, the magnetic moment (in Bohr Magneton) is given by
a)
b)
c)
d)

29) Wustite is
a) FeO
b)
c)
d)

30) Which of the following is an interstitial compound?
a) Steel
b) Brass
c) Gun metal
d) Solder

31) Which of the following atoms is not involved in the formation of interstitial compounds?
a) Hydrogen
b) Carbon
c) Nitrogen
d) Iodine

32) The inter particle forces between linear chains in Nylon – 66 are
a) Hydrogen bonds
b) Ionic bonds
c) Covalent bonds
d) None of these

33) Covalent compounds
a) Are good conductors of electricity
b) Are bad conductors of electricity
c) Conduct electricity only on heating
d) Conduct electricity only when present in the aqueous form

34) The ion that is isoelectronic with CO is
a) CN

b) O2 +

c) N2 +

d) O 2-

35)

The number of electrons in H2NCONH2 is
a) 12
b) 24
c) 21
d) 32

36) The number of atoms in a face entered cubic unit cell is
a) 4
b) 5
c) 6
d) 2

37) The structure of a CsCl crystal is
a) Body centered cubic lattice
b) Face centered cubic lattice
c) Octahedral
d) None of the above

38)  The unit cell with crystallographic dimensions a = b = c is
a) Cubic
b) Tetragonal
c) Monoclinic
d) Hexagonal

39) For an octahedral arrangement the radius ratio limit is
a) 0. 414 – 0.732
b) 0.155 – 0. 225
c) 0.225 – 0.414
d) 1.0 – 0.732

40) How many atoms are there in a cube based unit cell having one atom on each corner and two atoms on each diagonal of the cube?
a) 8
b) 6
c) 4
d) 9

41) In a diamond crystal, carbon is
a) Sp hybridized
b) Sp2 hybridised
c) 
Sp3 hybridised
d) None of these

42) Fe3 O4 is

a) Paramagnetic
b) Ferro magnetic
c) Diamagnetic
d) None of these

43) Cl O2 is
a) Paramagnetic
b) Diamagnetic
c) Ferromagnetic
d) None

44) In CaF2, the coordination of Ca 2+ and F ions are respectively
a) 8, 4
b) 4, 4
c) 6,4
d) 4,8

45) Asbestos contains
a) Silicate chains
b) Island chains
c) Ortho silicates
d) Ring anions

46) The bond energy of O – H bond is 109 K cal mol-1.  When one mole of water is formed
a) 218 Kcal is released
b) 109 Kcal is released
c) 218 Kcal is absorbed
d) 109 Kcal is absorbed

47) The square planar complex which shows geometrical isomerism is
a) MA2B2
b) MA4
c) MABCD
d) MA3B

48) The number of electrons shared in a molecule of NH4NO3 is
a) 18
b) 16
c) 14
d) 8

49) Which of the following is an odd electron molecule
a) PCI3
b) CCI4
c) N O
d) N2 O 4

50) Two elements A and B have the following configuration

A  -  1s2  2s2 2p3
B  -  1s2 2s2 2p6 3s2
The formula of the compound formed between A and B
a) AB
b) AB2
c) A2B3
d) A3B2
51) Which of the following molecule/molecules has/have trigonal pyramidal shape?
a) PCI3
b) NF3
c) H3O+
d) All
52) Which of the following is not paramagnetic ?
a) O2
b) He+2
c) N2
d) H+2
53) Which of the following molecules has a dipole moment?
a) BF3
b) CH4
c) BeF2
d) H2O
54) Which of the following is a covalent solid ?
a) ice
b) sodium chloride
c) dry ice
d) none
55) Identify the pair which violates the octet rule.
a) OF2,F2
b) PCI3, CI2
c) SF4, SF6
d) SO2,OF2
56) The observed dipole moment of HCI is 1.03D. If the dipole moment calculated, assuming 100% ionic character is 6.12 * 10 -18 e.s.u cm, the % ionic character of HCI is 
a) 16.83
b) 1.683 * 10 -17
c) 1.683 * 10 2
d) 0.016
57) The increasing order of N-N bond length in the following molecules of N2, N2H4 and N2F2 is
a) N2 < N2H4 < N2F2
b) N2< N2F2< N2H4
c) N2>N2F2>N2H4
d) N2F2< N2< N2H4
58) In ATP molecule the high energy phosophate bond is formed between 
a) 0-P
b) P-P
c) P-N
d) C-P

Answer :

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