DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
Assignment - Main Group Elements
1. For borazine, which one of the following statements is TRUE?
a)
b)
c)
d)
A nitrogen atom is nucleophilic in nature.
Boron atoms is nucleophilic in nature.
Bond between B and N is non – polar
Nitrogen atoms is electrophonic in natural.
2. The product formed on heating S2Cl2 and NH3 over solid NH4Cl is:
a) (SN)x
b) S3N3Cl3
c) S8Cl2
d) S4N4
3. Determine the correctness or otherwise of the following assertion [a] and the
Reason [r]. 4
Assertion [a]: Melting points of the halogens follows the order, F2 <
Cl2, < Br2 < I2.
Reason [r]: The polarizabilities follow the order F2< Cl2 < Br2 < i2.
a) Both [a] and [r] are true and [r] is the correct reason for [a]
Both [a] and [r] are true but [r] is not the correct reason for [a].
Both [a] and [r] are false.
[a] is true but [r] is false.
4. The number of lines that would be observed for 1s to 2p transition in one
electron system is: 2
a) 0
b) 1
c) 2
d) 3
5. Which of the following compound formed by xenon ahs the same number of
valence electrons as I 3 ?
a) XeO4
b) XeF4
c) XeF2
d) XeO3
6. Inverse crown ethers act as hosts for,
a) Anions
b) cations
c) alkali metals
d) lanthanides.
7. The hydrogen energies of the alkaline earth metal ions are significantly
GREATER than for the alkali metal ions because of.
a) Large size and smaller charge
b) Lager size and greater charge
c) Smaller size and smaller charge d) smaller size and greater charge
8. The effects on the non – metal when it combines with a metal are
a) Gain in electrons and increase in size.
Loss of electron and increase in size.
Gain in electron and decrease in size.
Loss of electrons and decrease in size.
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
1
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
9. Inverse crown ethers act as host for.
a) Cations
b) anions
c) Alkali metals
d) Lanthanides.
10. Phosphoric and phosphorus acid
a) Have zero and on P – H bond
c) Are both tripotic
b) Have no P – H bonds
d) Are both diprotic.
11. Which of the following has the smallest bond enthalpy
a) Si – H
b) C- H
c) Ge- H
d) Pb – H.
12. The composition of a sample of iron oxide is Fe0.93O. What percentage of Fe is
in 3+?
a) 0.07%
b) 7.0%
c) 30%
d) 15.1%
13. 5.26 gm of a sulfur containing ore of copper releases 2.12g of sulfur dioxide.
Assuming that the ore only contains copper and sulfur, what is the empirical
formula of the ore.
a) Cu2S
b) CuS2
c) CuS
d) Cu3S
14. PMe3 in a borane cluster is a:
a) 3 – electron donor
c) 1- electron donor
b) 2- electron donor
d) 5 – electron
15. The carbanion character of Group 13 alkyl compounds decrease in the order:
a) Al2FR6 > GaR3 > Br3
c) BR3 > Al2R6 > GaR3
b) Al2R6 > GaR3> BR3
d) GaR3 > BR3 > Al2R6
16. The halogen with the highest polarizability is:
a) Fluorine
b) chlorine
c) bromine
d) iodine.
17. The type force that holds the layers of carbon atoms in graphite together is:
a) Ionic
b) hydrogen – boding
c) Vander walls
d) covalent.
18. Among feldspar, muscovite mica and zeolite
a) All are three dimensional silicates,
b) Feldspar and zeolite are three dimensional, while zeolite and
muscovite mica are layered.
c) Feldspar is three dimensional, while zeolite and muscovite mica are
layered.
d) B represents an excited state of the atoms.
19. Consider the electronic state of an atoms A: 1s2 2s2 2p6 3s1 and B: 1s2 2s2 2p6
4s1, which one of the following statements is false?
a) Energy is required to change A into B.
A represents an alkali metal.
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
2
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
More energy is required to remove an electron form B than form A.
B represents an excited state of the atoms.
20. The chemical formula for hypo phosphoric acid.
a) H3PO4
b) H3PO3
c) H4P3O5
d) H4P2O6
21. Phosphorus pentoixde, P4O10 on hydrolysis gives.
a) H3PO3
b) H3PO4
c) HPO3
d) H3PO2
22. The formula of the pyrosilicate ion is
a)
SiO44 
b) Si2
O76 
c) Si3
O96 
d) Si6
O1812 
23. For H3 [PMO12O40] which one of the following statements is NOT true? 2
a)
b)
c)
d)
The nearest neighbours of P are 4 oxygen atoms.
The nearest neighbours of Mo are 6 oxygen atoms.
It is called a 12- hetero – poly acid.
It is synthesized by heating phosphate solution with ammonium
molybdate and NaOH.
24. Which one of the following statements for borazine is NOT correct?
a) It has six B – H bonds
c) It has three N – H bonds
b) It has three B = N bonds
d) It has a cyclic structure.
25. The basic reaction involved in the synthesis of silicones is
a) The hydrolysis of trimethyl chlorosilane
The hydrolysis of dimethly dichlorosilane
The acid hydrolysis ethyl chlorosilane
The acid hydrolysis of dimethyl silane.
26. The gaseous product of the reaction of boron trifluoride iwht
tetrahydroborate ion is
a) F2
b) HF
c) H2
d) B2H6
27. The metallic character of beryllium is due to
a) Partially filled 2s band
c) Overlap of 2s and 2p bands
b) completely filled 2s band
d) empty 2p band.
28. The perxenate is Xe O44  can be prepared by
a) Direct reaction of Xe with oxygen
c) Hydrolysis of XeF6 in acidic medium
medium.
b) reaction of XeF6 with oxygen
d) hydrolysis of XeF6 in basic
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
3
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
29. The number of hydrogen (OH) groups present in phosphorus acid is:
a) One
b) Two
c) Three
d) Four
30.
Column – I
Column – II
P. Ostwald process
Q. Solvay process
I. Manufacture of nickel
R. Mond process
III. Manufacture of Na2CO3.
S. Frash process
II. Manufacture of nitric acid
IV. Manufacture of silicones
V. Manufacture of caustic soda.
VI. Mining of elemental sulfur.
a)
b)
c)
d)
P–I
P – II
P – III
P – III
Q- III
Q- III
Q- I
Q – II
R – II
R- I
R-IV
R-V
S-VI
S-VI
S- V
S- VI
31. Mg6Si4O10(OH)8 is commercially known as.
a) Asbestos
b) water – glass
c) soda – glass
d) zeolite
32. In [B4O5(OH)4]2- the number of boron atoms having an of electron is:
a) 0
b) 1
c) 2
d) 4
33. Icosahedral structure is generally exhibited by
a) C
b) Si
c) Ge
d) b
34. Which phosphorus, P4, belongs to the
a) Closo system b) nido system
c) arachno system d) hypho system.
35. Among the following groups of metals, the one having the lowest melting
points us:
a) Alkaline earth
b) transition
c) Alkali
d) Lanthanide
36. Among the following pairs of ion/ molecules, the one having similar shapes
is:
a) CO2 and H2O
b) BF3 and H3C+ c) CCl4 and PtCl4 d) NH3 and BF3.
37. The number of orbitals present in the n = 4 atomic shell is:
a) 64
b) 32
c) +3
d) +7
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
4
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
38. For a 6p sub – shell, the positive value that ml can have is:
a) +1
b) +6
c) +3
d) +7
39. When Al4C3 and Mg2C3 reacts with H2O, then major products formed
respectively, are 2
a) Ethyne and ethane
c) Propane and propene
b) Methane and propyne
d) methane and propene
40. Which one of the following molecules exists as a monomer under ambient
conditions?
a) Trimethyl aluminium
c) Triphenyl aluminium
b) Triethyl aluminium
d) Trimesityl aluminium
Linked Answer Questions 41 and 42.
41. The reaction of ammonium chloride with BCl3 and 1400C at followed givens
the products. X the formula of X is:
a) B3N3H3
b) B3N3H6
c) B3N3H12
d) [BH – NH]n
42. Which of the following statement (s) is/ are true for X?
i. X is not isoelectronic with benzene.
ii. X undergoes addition reaction with HCl.
iii. Electrophonic substitution reaction on X is much faster than the of
benzene.
iv. X undergoes polymerization at 900C.
a) i and ii
b) only ii
c) ii and iii
d) i and iv
43. The atomicity and the total number of bonds in the elements white
phosphorus molecule are respectively.
a) 4 and 6
b) 6 and 4
c) 4 and 4
d) 6 and 6
44. Which one of following reactions is NOT isoelectronic with CO?
a) N2
b) CN-
c) NO+
d) O2
45. Which of the following reactions does NOT give H3PO4?
a) Ca3 (PO4)2 + H2SO4 
c) PCl5 + H2O 
b) P4O6 + H2O 
c) P4S10+ H2O 
46. The most abundant element in each’s crust is:
a) Aluminium
b) Iron
c) Silicon
d) Oxygen
47. The compound having an S – S single bond is
a) H2S2O3
b) H2S2O4
c) H2S2O7
c) H2S2O8
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
5
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
48. In a reaction, Na2S2O3 is converted to Na2S4O6 the equivalent weight of
Na2S2O3 for this reaction is (mol. Wt. of Na2S2O5 = M)
a) M
b) M/4
c) M/2
d) M/3
49. The acceptable valence shell electronic arrangement is:
b)
a) ↑↓
↑↓
↑
↑↓
↑
2s
2p
2s
c) ↑↓
↑
↑
↑
d)
↑
↑↓
2s
2p
2s
↑
↑
2p
↑
↓
2p
50. In the thermite process, iron oxide is reduced to molten iron by aluminum
powder because.
a) The melting point of iron is low
The reaction is higher endothermic
Large amount of heat is liberated in the formation of Al2O3.
b) Aluminium is an ampheteric element.
51. The number of P =O bonds present in the tetra basic acid H4P2O7 is: 2
a) Three
b) Two
c) One
d) None
52. Egyptian blue CaCuSi4O10 is an example of.
a)
Sheet silicate
b) Cyclic silicate
c) One
d) Chain silicate
53. Calgon used for water softening is Na2 [Na4(PO3)6] and it is prepared by
heating microcosmic salt. The microcosmic salt is:
a) Na2HPO3
b) NaH2PO4
c)Na2HPO4
d) Na(nh4)HPO4
54. The correct order of stability of difluorides is:
a) GeF2 > SiF2 > CF2
c) SiF2 > GeF2 > CF2
b)CF2 > SiF2 > GeF2
d) CF2 > GeF2 > SiF2
55. Alkali metal superoxide are obtained the reaction of
a) Oxygen with alkali metal in liquid ammonia.
Water with alkali metals in liquid ammonia.
H2O2 with alkali metals.
H2O2 with alkali metals in liquid ammonia.
56. H2O2 reduces
(A)[Fe(CN)6]3-
B) KIO4
C) Ce(SO4)2
a) A and B only
c) C and D only
b) B and C only
d) B and D only
D) SO32
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
6
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
57. Match List – I (compounds) with List II (application) and select the correct
answer using the codes given below the lists. 4
List –I
List – II
(A) Trisodium phosphate
(i) Plasticizer
(B) Triarylphosphates
(ii) Water softener
(C) Triethylphosphate
(iii) Toothpaste
(D) Calcium hydrogen phosphate
(iv) Insecticides
a) (A) – ii
(A) – i
(A)- ii
(A) – iii
(B) – i
(C) – iv
(D) – iii
(B) – ii
(C) –iv
(D) – iii
(B) – iii
(C) – iv
(D) – i
(B) – i
(C) – ii
(D) - iv
58. Among the following the number of anhydrides of acids are
CO, No, N2O, B2O3, N2O5, SO3 and P4O10,
a) 3
b) 4
c) 5
d) 6
59. Among the following substituted silanes, the one that gives cross – linked
silicone polymer upon hydrolysis is.
a) (CH3)4 Si
b) CH3SiCl3
c) (CH3)2 SiCl2
d) (CH3)3SiCl
60. The correct statement regarding closo - Bn H n  species is: 2
a) It always has -2 charge
b) it always has +2 charge
c) It is a neutral species
it is more reactive than nido arachno, and hypo – boranes
61. lewis acidity of BCl3, ad BMe3 with respect to pyridine follows the order
a) BCl3 > BPh3 > BMe3
c) BPh3 > BMe3 > BCl3
b) BMe3 > BPh3 > BCl3
d) BCl3 > BMe3 > BPh3
62. Among following pairs.
(1) Oxygen – sulphur
(2) Nitrogen – phosphorus
(3) Phosphours arsenic
(4) Chlorine – iodine
These is which the first ionization energies differ by more than 300 KJ
mol-1 are:
a) (I) and (3) only
c) (2) and (3) only
b) (1) and (2) only
d) (3) and (4) only
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
7
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
63. The reaction between NH4Br and Na metal in liquid ammonia (solvent)
results in the products
a) NaBr, HBr
c) H2, HBr
b) NaBr, H2
d) HBr, H2
64. The material exhibits the highest electrical conductivity among the following
sulfur – nitrogen compounds is. 4
a) S4N4
b) S3NH
c) S2N2
d) (SN)x
65. A sodalite cage in zeolite is 2
a) A truncated tetrahedron
c) A truncated octahedron
b) an icosahedrons
d) a dodecahedron.
66. The final product (s) of the reaction P(OR)3+R’X is/are.
a) R’PO(OR)2 and RX
c) [R’RPO2(OR)]X
b) [R’PO(OR)2]X
d) ROR’ and P(OR)2X
67. At any temperature for the following reaction (D and T are deuterium and
tritium respectively) correct state ment is:
(A) HCl + F  HF + Cl,
(B) DCl + F  DF+Cl,
(C) TCl + F  TF + Cl
a) (A) is fastest
b). (B) is fastest
c) (C) is fastest
d) All the above reactions have the same rate constant.
68. The styx code of B4H10 is:
a) 4120
b) 4220
c) 4012
d) 3203
69. Bayer’s process involves.
a) Synthesis of B2H6 from NaBH4
Synthesis of NaBH4 form borax
Synthesis of NaBH4 form B2H6
Synthesis of B3N3H6 from B2H6.
70. The melting of lithium metal is 454 K, and that of sodium is 371K. Which of
the following statements can explain this difference in their melting points?
i.
Metallic bonding in lithium is stronger than, metallic bonding in
sodium.
ii.
The delocalised electrons are more strongly attracted to the metal
cation of lithium.
iii.
The lithium cations have a greater charge density than sodium cation.
iv.
Li+ cations are smaller than Na+ cations.
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
8
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
a) Only (i) and (ii) b) only (ii) and (iii)
c) c) only (iv)
d) (i) , (ii), (iii) and (iv),
71. The industrial process by which HNO3 is prepared from NH3 is:
a) Ostwald’s process
c) Contact process
b) Haber process
d) Magnola process
72. The xenon fluoride which excellent fluorinating agent of aromatic
compounds, in the presence of a Lewis acid is:
a) XeF6
b) XeF4
c) XeF2
d) XeOF2
73. The size of the d orbitals in Si, P, S and Cl follows the order.
a) Cl > S > P > Si
c) P > S > Si > Cl
b) Cl > P > S > Si
d) Si > P > S > Cl
74. The strength of pπ – dx bonding in E – O (E = Si, P and C) follows the order
a) Si - > O > P – O > S – O > Cl – O
c) S – O > Cl – O > P – O > Si – O
b) P – O > Si – O > S – O > Cl – O
d) Cl – O > S – O > P – O > Si – O
75. The quantitative determination of N2H4 KIO3 proceeds in a mixture of H2O/
CCl4 as follows
N2H4 + KIO3 + 2HCl  N2 + KCl + ICl + 3H2O
The end point for the titrimetric reaction is:
a) Consumption of N2H4
b) ICL formation
c) Disappearance of the yellow colour due to Cl2 in CCl4 layer.
Displacement of the rod colour due to I2 is CCl4 layer.
76. Among the halides, NCl3(A), PCl3(B) and AsCl3(C), those which produce two
different acids.
a) A and B
b) A and C
c) B and C
d) A, B and C
77. The decreasing order of dipole moment of molecules is
a) NF3 > NH3 > H2O
c) H2O > NH3 > NF3
b) NH3 > NF2 > H2O
d) H2O > NF3 > NH3
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
9
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
78. The correct structure of P4S3 is:
79. The most used acid catalyst in oil industry and the relevant process are
respectively
a) Aluminophosphate and reforming
Aluminosilicate and cracking
Aluminosilicate and reforming
Aluminophosphate and cracking.
80. Global warming is due to increase of
a) Methane in atmosphere
c) Water vapour
b) CO2 in atmosphere
d) Methane and CO2
81. The total number of Cu – O bonds present in the crystalline copper (II)
acetate monohydrate is:
a) 10
b) 6
c) 8
d) 4
82. The Electronegativity difference is the highest for the pair.
a) Li, Cl
b) K,F
c) Na, Cl
d) Li, F
83. Boric acid is a weak acid in aqueous solution. But it acidity increase
significantly in the presence of ethylene glycol, because.
a) Ethylene glycol releases additional H+
B(OH)4- is consumed in forming compound with ethylene glycol.
b) Ethylene glycol neutralizes H+ released by boric acid.
c) Boric acid dissociations better in the mixed solvent.
84. Silicates with continuous 3D from work are
a) Neso – silicates
c) phyllo – silicates
b) Soro – silicates
d) tecto silicates
85. Conversion of boron trifluoride to tetrahfluoroborate accompanies
a) Increase in symmetry and bond elongation
Increase in symmetry and bond contraction
Decrease in symmetry and bond contraction
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
10
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
Decrease in symmetry band bond elongation.
Common data for Q.86 and Q.87:
Heating a mixture of ammonium chloride and sodium tetrahydridoborate
gives one liquid product (S), along with other products under ambient
conditions.
86. Compound X is :
a) NH4 (BH4)
c) N3B3H6
b) [(NH3)2BH2][BH4]
d) unsaturated heterocyclic.
87. Compound X is an example of
a) Ionic liquid
c) Molecular cage
b) saturated heterocyclic
d) unsaturated heterocycle.
88. Which of the following is used as propellant for whipping creams?
a) N2O
b) NO
c) N2O3
d) N2O5 \
89. Flame proof fabrics contain
a) H2NC(O) NH2. Na2SO4
c) H2NC (O) NH2. H3PO4
b) H2NC (S) NH2. Na2SO4
d) H2NC(S)NH2.H3PO4
90. Among the compounds A – D, those which hydrolyse easily are
a) NCl3
b) NF3
c) BiCl3
d) PCl3.
91. Which of the pairs will generally result in tetrahedral coordination
complexes, when ligand are Cl- or OH(A) Be (II), Ba(II)
(B) (II), Co(II)
(C) Co(II), Zn(II) (D) Be (II),Zn(II)
a) A and B
b) B and C
c) C and D
d) A and D
92. The correct equilibrium order for the interconversion of different form of
SiO2 is:
a) Tridymite ⇌ quartz ⇌ Cristobalite ⇌ liquid SiO2
Quartz ⇌
Tridymite ⇌ Cristobalite ⇌ liquid SiO2
Quartz ⇌ cristobalite ⇌ tridymite ⇌ liquid SiO2
Cristobalite ⇌ Tridymite ⇌ quartz ⇌ liquid SiO2
93. Which of the following pairs has the highest difference in their first
ionization energy?
a) Xe, Cs
b) Kr, Rb
c) Ar, K
d) Ne, Na
94. Electron charge in reduction of Ce(SO4)2, KMnO4, HNO2 and I2 with hydrazine
in acidic medium, respectively is
a) 1e, 1e, 2e and 4e
b) 1e, 3e, 2e and 4e
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
11
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
c) 2e, 3e, 1e and 4e
d) 2e, 4e, 1e and 3e
95. Among the oxides of nitrogen, N2O3, N2O4 and N2O3 the compounds (s) having
N – N bond is/ are
a) N2O4 and N2O5
c) N2O3 and N2O4
b) N2O3 and N2O5
d) N2O5 only
96. The correct order of reactivity of the valence s – elkectrons of Sn(II), Pb(II)
and Ge(II) is
a) Pb (II) > GTe(I) > Se (II)
c) Pb(II) > Sn(II) > Ge(II)
b) Ge(II) > Sn(II) > Pb(II)
d) Sn(II) > Ge (II) > pb(II)
97. The correct order of ease of polymerization of
a)
PO43
>
Si44
>
ClO4
b)
PO43
c)
Si44
PO43
>
ClO4
c)
Si44
>
<
PO43 Si44 ClO4
,
is
Si44
<
ClO4
PO43
<
ClO4
<
98. The bond angle in [S2=O3]2- ion is:
a) 1200
b) 109.50
c) 1040
d) 900
99. When a solid A is heated, two different gases are formed along with a new
solid. One of the gases, B dissolved in water to give a mixture of nitronus and
nitric acids. The new solid was found to react with violentlyto produce a base
solution. The solid A and the gas B are.
a) KNO3 and NO
c) Ca(NO3)2 and NO2
b) Ca(NO3)2 and NO
d) KNO3 and NO2
100. The product of the reaction of P4O10 (s) with water is.
a) PH 4 (aq)
b) PH3
c) H3PO4 (aq)
d) HPO2 (aq)
101. Which of the following elements in the most toxic non – radioactive element?
a) Cadmium
b) beryllium
c) rhenium
d) leand
102. Which oen of the following is a redox reaction?
a) Pb2+ (aq) + SO42 (aq)  PbSO4 (s)
AgNO3 (aq) + HCl (aq)  AgCl (s) + HNO3 (aq)
Mg (s) + Cl2 (g)

MgCl2 (s)
KOH (aq) + HI (aq)  KI (aq) + H2O (l)
103. Choose the correct isoelectronic pair.
a) B – N and C – O
c) C – N and N – O
b) B – N and C – C
d) Be – B and Be – O
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
12
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
104. Which one of the following compounds is the most stable one?
a) Lil3
b) CsI3
c) NaI3
d) KI3
105.Commonly used scintillator for reassuring radiation is:
a) NaI (AI)
b) NaI (TI)
c) CsI (TI)
d) CsI (Al)
106.Among the molten alkali metals the example of an immiscible pair (in all
proportions) is
a) K and Na
b) K’ and Cs
c) Li and Cs
d) CsI (Al)
107.Among the following, an example of a hypervalent species is.
a) BF3. OEt2
b) SF4
c) [PF6]-
d) Sb2S3
108. Treatment of CIF3 with SbF5 leads to the formation of a/ an
a) Polymeric material
c) Ionic compound
b) covalent cluster
d) Lewis acid – base adduct
109. The reasons for the chemical inertness of gaseous nitrogen at room
temperature is best given by its
a) High bonding energy only
b) electronic configuration
c) HOMO – LUMO gap only
d) high bond energy and HOMO – LUMO gap
110.Two tautomeric forms of phosphorus acid are
111. In a specific reaction, hexachlorocyclotriphosphazene, N3P3Cl6 was reacted
with a metal fluoride to obtain mixed halo derivatives namely N3P3Cl3F(A),
N3P3Cl4F2(B) , N3P3Cl3F3 (C), N3P3Cl3F4 (D), N3P3 CIF5(E).
a) A, B and C
b) B, C and D
c) C, D and E
d) E, A and B
112.Xenon forms several fluorides and oxofluorides which exihibit acidic
behavior. The correct sequence of descending lewis acidity among the given
species is represented by.
a) XeF6 > XeOF4 > XeF4 > XeO2F2
c) XeF4 > XeO2F2 > XeOF4 > XeF6
d) XeOF4 > XeO2F2 > XeOF4 > XeF6
d) XeF4 > XeF6 > XeOF4 > XeO2F2
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
13
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
113.The gases SO2 and SO3 were reacted separately with CIF gas under ambient
conditions. The major products expected from the two reactions respectively
are.
a) SOF2 and CIOSO2F
c) SO2 CIF and SO2F2
b) SOF2 and SO2F2
d) SO2 CIF and CIOSO2F
114.The correct statement for ozone is .
a) It is mostly destroyed by No radical in atmosphere
It is non toxic even at 100 ppm level
Its concentration near poles is high due to paramagnetic nature.
The solid structure of aluminium fluoride is.
115.The solid state structure of aluminum fluoride is.
116. The orbital interactions shown below represent.
Sp3 orbitals
S- orbitals
a) CH3 – Al interactions in Al3(CH3)6
c) CH3 – Li interaction Li4(CH3)4
EtMgBr(OEt2)2
b) B- H interactions in B2H6
d) CH3CH2 – Mg interactions in
117. What is the nature of silicon oxygen bonds in silica (SiO2)?
a) Polar covalent b) Ionic
c) Nonpolar covalent (d) coordinate covalent
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
14
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
118.BCl3 and NH4Cl were heated at 1400C to give compound X, which when
treated with NaBH4 gave another compound Y. Compound X and Y are.
a) X= B3N3H3Cl3 and Y = B3N3H6 b) X = B3N3H9Cl3 and y = B3N3H6
c) X= B3N3H3Cl3 and Y = B3N3H12 d) X = B3N3Cl6 and Y = B3N3H6
119.The number of S – S bond in H2S5O6 is
120. Ozone present in upper atmosphere protects people on the earth
a) Due to its diamagnetic nature
Due to its blue colour
Due to absorption of radiation of wavelength at 255 nm
By destroying chlorof luoro carbons
121.Chromites ore on fusion with sodium carbonate gives
a) Na2CrO4 and Fe2O3
c) Cr2(CO3) and Fe(OH)3
b) Na2Cr2O7 and Fe2O3
d) Na2CrO4 and Fe2(CO3)3
122.The correct of decreasing electronegative of the following atom is,
a) As > Al >Ca > S
c) Ca > S > As
b) S> As> Al > Ca
d) S > Ca > As > Al
123.The correct order of size of S, S2-, S2+ and S4+ species is,
a) S > S2+ > S4+ > S2c) S2- > S > S2+ > S4+
b) S2+ > S4+ > S2- > S
d) S4+ > S2- > S > S2+
124.Among the following species, (A) Ni(II) dimethylglyoximate, (B) Al (III) as
oxinate, (C) Ag (I) as chloride, those that precipitate with the urea hydrolysis
method are .
a) A, B and C
b) A and B
c) A and C
d) B and C
125. Reaction of elemental as with hot and conc. HNO3 and H2SO4, respectively,
give
a) As4O6 and (SO4)3
c) As4O6 and H3AsO4
b) As(NO3)5 and As2(SO4)3
d) H3AsO4 and As4O6
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
15
DYNAMIC CHEMISTRY POINT
Assignment No –1
Topic Name - Main Group Elements
Answer key (Main Group Elements)
1.(d)
2.(d)
3.(a)
4.(c)
5.(c)
6.(b)
7.(d)
8.(a)
9.(a)
10.(a)
11.(d)
12.(d)
13.(a)
14.(b)
15.(a)
16(d)
17.(d)
18.(b)
19.(c)
20.(d)
21.(a)
22.(b)
23.(d)
24.(a)
25.(a)
26.(d)
27.(c)
28.(d)
29.(b)
30.(b)
31.(a)
32.(c)
33.(d)
34.(b)
35.(c)
36.(b)
37.(c)
38.(a)
39.(b)
40.(d)
41.(b)
42.(b)
43.(a)
44.(d)
45.(b)
46.(d)
47.(b)
48.(a)
49.(c)
50.(c)
51.(b)
52.(a)
53.(d)
54.(a)
55.(a)
56.(a)
57.(a)
58.(b)
59.(b)
60(a)
61.(b)
62.(b)
63.(b)
64.(d)
65.(c)
66.(a)
67.(d)
68.(c)
69.(b)
70.(d)
71.(a)
72.(b)
73.(d)
74.(d)
75.(d)
76.(c)
77.(c)
78.(a)
79.(b)
80.(d)
81.(a)
82.(b)
83.(b)
84.(d)
85.(a)
86.(c)
87.(c)
88.(a)
89.(c)
90.(b)
91.(c)
92.(b)
93.(d)
94(a)
95(c)
96.(c)
97.(c)
98.(b)
99.(d)
100.(c)
101.(d)
102.(c)
103.(b)
104.(d)
105.(b)
106.(c)
107.(c)
108.(c)
109.(d)
110.(a)
111.(b)
112.(a)
113.(d)
114.(a)
115.(c)
116.(c)
117.(a)
118.(a)
119.(d)
120.(c)
121.(a)
122.(b)
123.(c)
124.(b)
125.(d)
H.O: - 28A/11, Ist Floor, Jia Sarai, Hauz Khas, Near IIT Delhi-16
Phone No.-011-69000403, 9810236711 -09599967768
16