Q.1.
What type of hybridization is possible in square planar molecules? [ Pb CET 1991]
-
29%
a)sp3d
-
0%
b) dsp3
-
29%
c)dsp2
-
43%
d)sp3d2
Q.2.
NH3 has a much higher boiling point that PH3 because ... [ MLNR 1994]
-
20%
a) NH3 has larger molecular weight
-
0%
b) NH3 undergoes umbrella inversion
-
60%
c) NH3 forms hydrogen bond
-
20%
d) NH3 contains ionic bonds whereas PH3 contains covalent bonds
Q.3.
The complex ion [Co(NH3)6]3+ is formed by sp3d2 hybridization. Hence the ion should posses ... [ CBSE PMT 1990]
-
80%
a) Octahedral geometry
-
20%
b) tetrahedral geometry
-
0%
c)square planar geometry
-
0%
d)tetragonal geometry
Q.4.
Which of the following is the correct order of interactions? [ CBSE PMT 1993]
-
20%
a) Covalent < hydrogen bonding < van der Waals < dipole - dipole
-
80%
b) van der Waals < hydrogen bonding < dipole - dipole < Covalent
-
0%
c)van der Waals
- 0%
d)dipole - dipole < van der WaalsQ.5.Which type of bond is not present in HNO2 molecule .. [ Roorkee Screen Test 1991]-
25%
a)Covalent
-
12%
b) Co-ordinate
-
25%
c)Ionic
-
38%
d)Ionic as well as co-ordinate
Q.6.Which of the following will have low heat of fusion? [ DEC 1994]-
0%
a) covalent solid
-
25%
b) metallic solid
-
50%
c)an ionic solid
-
25%
d)a molecular solid
Q.7.In allene structure three carbon atoms are joined by ... [ BHYU 1993]-
33%
a) three sigma bonds and three pi-bonds
-
67%
b) Two sigma bonds and one pi-bond
-
0%
c)Two sigma bonds and two pi bonds
-
0%
d)three pi bonds only
Q.8.Intermolecular forces in solid hydrogen are ... [ Pb CET 1991]-
25%
a)van der Waal's forces
-
50%
b) Covalent forces
-
25%
c)Hydrogen bonds
-
0%
d)None of these
Q.9.Among LiCl, BeCl2, BCl3 and CCl4 the covalent bond character follows the order ... [ CBSE PMT 1990]-
17%
a) LiCl < BeCl2 > BCl3 > CCl4
-
67%
b) LiCl > BeCl2 < BCl3 < CCl4
-
0%
c) LiCl < BeCl2 < BCl3 < CCl4
-
17%
d) LiCl > BeCl2 >BCl3 > CCl4
Q.10.The central atom assumes sp3 hybridization in ... [ MLNR 1994]-
57%
a) PCl3
-
0%
b) SO3
-
14%
c)BF3
-
29%
d)NO3-
Q.11.Strongest hydrogen bond is shown by ... [ CBSE PMT 1992]-
17%
a)Water
-
33%
b) Ammonia
-
50%
c)Hydrogen fluoride
-
0%
d)Hydrogen sulphide
Q.12.Mark the incorrect statement in the following ... [ CBSE PMT 1994]-
33%
a) the bond order in the species O2, O2+ and O2- decreases as O2+ > O2 > O2-
-
33%
b)The bond energy in a diamatic molecule always increases when an electron in lost
-
33%
c)Electrons in antibonding M.O> contribute to repulsion between two atoms
-
0%
d)With increase in bond order, bond length decreases and bond strength increases
Q.13.Linear combination of two hybridized orbitals belonging to two atoms and each having one electron leads to a .. [ CBSE PMT 1990]-
50%
a) Sigma bond
-
25%
b) Double bond
-
25%
c) Co-ordinate covalent bond
-
0%
d) pi- bond
Q.14.Elements have electronegativities 1.2 and 3.0 bond formed between them would be ...{CPMT 1994]-
60%
a) Ionic
-
20%
b) Covalent
-
20%
c)Co-ordinate
-
0%
d)Metallic
Q.15.Which of the following does not exhibit paramagnetism? [ BHU 1993]-
33%
a) NO
-
0%
b) NO2
-
17%
c)ClO2
-
50%
d)ClO2-
Q.16.The element having electron configuration 1s2, 2s2, 2p6, 3s2, 3p3 is [ CPMT 1991]-
40%
a)Only trivalent
-
20%
b) Only tetravalent
-
20%
c)Only pentavalent
-
20%
d)tetravalent and pentavalent
Q.17.Which of the following properties would suggest that a compound under investigation is covalent? [ pb. CET 1990]-
0%
a) It conducts electricity on melting
-
75%
b) It is a non-electrolyte
-
25%
c) It has a high melting point
-
0%
d) It is a compound of metal and non metal
Q.18.The dielectric constant of H2O isthe electrostatic force of attraction between Na+ and Cl- will be .... [ CBSE PMT 1994]-
0%
a) reduced to 1/40 in water than in air
-
67%
b) reduced to 1/80 in water than in air
-
33%
c)will be increased to 80 in water than in air
-
0%
d)will remain unchanged
Q.19.Two lone pairs of electrons and two bonded pairs of electrons are present in ... [ CPMT 1993]-
33%
a) NH3
-
0%
b) BF3
-
67%
c)H2O
-
0%
d)CO2
Q.20.Which one of the following is paramagnetic? [ CPMT 1992]-
0%
a)NO+
-
67%
b) O2-
-
0%
c)CN-
-
33%
d)CO
Q.21.Which one shows maximum hydrogen bonding? [ CBSE PMT 1990]-
17%
a) H2O
-
17%
b) H2Se
-
33%
c) H2S
-
33%
d) HF
Q.22.Which of the following structures is expected to have three bond pairs and one loan pair? [ JIPMER 1994]-
67%
a) tetrahedral
-
8%
b) trigonal planar
-
25%
c)pyramidal
-
0%
d)octahedral
Q.23.The percentage of s-character in the hybrid orbitals sp, sp2 and sp3 follows the pattern... [ AIIMS 1993]-
33%
a) sp3 > sp2 > sp
-
50%
b) sp > sp2 > sp3
-
17%
c)sp=sp2 > sp3
-
0%
d)sp=sp2=sp3
Q.24.In compound X, all the bond angles are exactly 109°28'. X is-
0%
a)Chloromethane
-
83%
b) Carbon tetrachloride
-
0%
c)Iodoform
-
17%
d)Chloroform
Q.25.According to molecular orbital theory, O2+ possesses ... [ Pb CET 1989]-
80%
a) Bond order of 2.5
-
0%
b) Three unpaired electrons
-
0%
c) Diamagnetic character
-
20%
d) Stability lower than O2
Explanation
Q.26.Which of the following has a net dipole moment? [ harayana CEET 1994]-
50%
a) CCl4
-
25%
b) BF3
-
25%
c)NH3
-
0%
d)CO2
Q.27.The distribution of electrons in the molecular orbital of O2 molecule is as follows... [ ISM 1994] σ1s2,σ*1s2σ2s2,σ*2s2σ2pz2-
0%
a) π2px2 ,π2py2π*2px2 ,π*2py0
-
67%
b)π2px2 ,π2py2π*2px1 ,π*2py1
-
0%
c)π2px2 ,π2py1π*2px1 ,π*2py2
-
33%
d)π2px2 ,π2py0π*2px2 ,π*2py2
Explanation
Q.28.Both sp2 and sp3 hybrid carbon are present in which one of the following compounds? [ CPMT 1992]-
0%
a)CH3 - CH3
-
17%
b) CH2=CH2
-
0%
c)CH Ξ CH
-
83%
d)CH3 -CH=CH - CH3
Q.29.in an anion HCOO- the two carbon-oxygen bonds are found to be of equal length. What is the reason for it? [ AIEEE 2003]-
0%
a) Electronic orbitals of carbon atom are hybridize
-
33%
b) The C=O bond is weaker than C-O bond
-
33%
c) The anion HCOO- has two resonating structures
-
33%
d) The anion is obtained by removal of proton from the acid molecule
Q.30.hich as minimum bond angle? [ Pb CET 1986]-
57%
a) H2O
-
14%
b) H2S
-
0%
c)NH3
-
29%
d)CH4
Explanation
- 0%
