Q.1.
Which of the following have permanent dipole moment? [ AIIEEE 2005]
-
10%
a)BF3
-
40%
b) SiF4
-
40%
c)SF4
-
10%
d)XeF4
Explanation
Q.2.
Which of the following halogens has the highest bond energy [ IIT 1981]
-
45%
a) F2
-
36%
b) Cl2
-
9%
c)Br2
-
9%
d)I2
Explanation
Q.3.
Which of the following molecules is not linear? [ Pb CET 1989]
-
10%
a) CO2
-
50%
b) SO2
-
40%
c) C2H2
-
0%
d) MgCl2
Q.4.
In which one of the following molecules can the central tom said to adopt sp2 hybridization? [ CBSE PMT 1989]
-
25%
a) BeF2
-
38%
b) BF3
-
38%
c)C2H2
-
0%
d)NH3
Q.5.
Which of the following is diamagnetic ... [ CPMT 1988]
-
38%
a) O2
-
12%
b) O2+
-
12%
c)O2-
-
38%
d)O22-
Q.6.
Dipole moment is shown by ... [ IIT 1986]
-
0%
a)1,4 dichlorobenzene
-
20%
b) cis-1,2-dichloroethene
-
80%
c)trans-1,2,-dichloroethene
-
0%
d)trans-2,3,-dichloro-2-butene
Q.7.
Of the following which one has lowest boiling point? [ CBSE PMT 1989]
-
40%
a) AsH3
-
20%
b) SbH3
-
20%
c) PH3
-
20%
d) NH3
Explanation
Q.8.
Which of the following has a linear structure? [ IIT 1986]
-
0%
a) CCl4
-
50%
b) CO2
-
33%
c)C2H2
-
17%
d)C2H4
Q.9.
Which one of the following has the regular tetrahedaral structure? [ AIEEE2004]
-
14%
a) XeF4
-
29%
b) [Ni(CN)4]2-
-
57%
c)BF4-
-
0%
d)SF4
Q.10.
Which of the following compounds have linear structure [ IIT 1986]
-
0%
a)CCl4
-
17%
b) SO2
-
50%
c)C2H2
-
33%
d)C2H4
Q.11.
H2O has a net dipole moment while BeF2 has zero dipole moment because .... [ CBSE PMT 1989]
-
17%
a) H2O molecule is linear while BeF2 is bent
-
50%
b) BeF2 molecule is linear while H2O is bent
-
17%
c) Fluorine has more electronegativity than oxygen
-
17%
d) Beryllium has more electronegativity than Oxygen
Explanation
Q.12.
The angle between the overlapping of one s-orbital and one p-orbital is .... [ CBSE PMT 1988]
-
40%
a) 180°
-
20%
b) 120°
-
40%
c)109°28'
-
0%
d)120° 60'
Explanation
Q.13.
Among the following compounds the one that is polar and has the central atom sp2 hybridization .. [ IIT 1997]
-
33%
a) H2CO3
-
17%
b) SiF4
-
17%
c)BF3
-
33%
d)HClO2
Q.14.
CO2 is not iso structural with ... [ IIT 1984]
-
43%
a)HgCl2
-
57%
b) SnCl2
-
0%
c)C2H2
-
0%
d)ZnCl2
Q.15.
Molecular orbital theory was given by ..[ BHU 1987]
-
17%
a) Mulliken
-
17%
b) Moseley
-
50%
c) Werner
-
17%
d) Kossel
Q.16.
The hybrid orbital used by chlorine atom in ClO2- ... [ IIT 1992]
-
33%
a) sp3
-
33%
b) sp2
-
0%
c)sp
-
33%
d)None of these
Q.17.
The maximum number of 90° angle between bond pair-bond pair of electrons is observe in ... [ AIEEE 2004]
-
0%
a) dsp2 hybridization
-
80%
b) sp3d2 -hybridization
-
0%
c)dsp2 -hybridization
-
20%
d)sp3d - hybridization
Q.18.
if a molecule MX3 has zero dipole moment the sigma bonding orbitals used by M( atomic number < 21) are ... [ IIT 1981]
-
0%
a)Pure p
-
20%
b) sp hybrid
-
80%
c)sp2 hybrid
-
0%
d)sp3
Q.19.
In a homonuclear molecule which of the following set of orbitals are degenerate? [ AIIMS 1989]
-
20%
a) σ2s and σ1s
-
60%
b) π2px and π2py
-
0%
c) π2px and σ2pz
-
20%
d) σ2pz and π*2px
Q.20.
The bond angle between H - O - H in ice is closest to ... [ CPMT 1989]
-
33%
a) 109°28'
-
17%
b) 60°
-
0%
c)90°
-
50%
d)105°
Q.21.
Equilateral shape has ... [ CBSE PMT 1988]
-
20%
a) sp hybridization
-
40%
b) sp2 hybridization
-
40%
c)sp3 hybridization
-
0%
d)sp3d hybridization
Explanation
Q.22.
Amongst the following molecules the one with the largest distance between the two adjacent carbon atoms is ... [ IIT 1979]
-
40%
a)Ethane
-
20%
b) Ethene
-
20%
c)Ethyne
-
20%
d)Benzene
Q.23.
In co-ordinate valency valency [ CPMT 1989]
-
20%
a) electrons are equally shared by the atoms
-
40%
b) electrons of one atom are shared by two atoms
-
40%
c) hydrogen bond is formed
-
0%
d) one of the above
Explanation
Q.24.
Which of the following molecule does not have a linear arrangement of atom? [ CBSE PMT 1989]
-
57%
a)H2S
-
29%
b) C2H2.
-
14%
c)BeH2
-
0%
d)CO2
Q.25.
Which has a covalent bond? [ AFMCE 1988]
-
29%
a) Na2S
-
57%
b) SnCl4
-
0%
c)NaH
-
14%
d)MgCl2
Q.26.
The correct order of bond angles ( small first in H2S, NH2, BF3 and SiH4 is [ AIEEE 2004]
-
0%
a)H2S < SiH4 < NH2 < BF3
-
50%
b) H2S < NH2 < BF3 < SiH4
-
33%
c) H2S < NH2 < SiH4< BF3
-
17%
d) NH2 < H2S < SiH4< BF3
Q.27.
the hybridization of carbon involved in C-C single bond in CH Ξ C - CH=CH2 is ... [ IIT 1991]
-
17%
a) sp3 - sp2
-
33%
b) sp3 - sp3
-
33%
c) sp - sp2
-
17%
d) sp - sp3
Q.28.
The compound in which C uses sp3 hybrid orbitals for bonding formation ... [ IIT 1989]
-
20%
a) HCOOH
-
40%
b) (NH2)2CO
-
0%
c)(CH3)3COH
-
40%
d)CH2 + C=O
Q.29.
The boiling point is not affected due to hydrogen bonding in
-
20%
a) Water
-
20%
b) ammonia
-
20%
c)methyl alcohol
-
40%
d)hydrogen chloride
Q.30.
The boiling points of methanol, water and dimethyl ether are respectively 65°C, 100°C and 34.5°C. Which of the following best explains these wide variations in b.p
-
20%
a) The molecular mass increases from water(18) to methanol(32) to diethyl ether(74)
-
80%
b)The extent of H-bonding decreases from water to methanol while it is absent in ether
-
0%
c)The extent of H-bonding decreases from ether to methanol to water
-
0%
d)The density of water is 1.00 g ml-, methanol 0.7914 g ml-1 and that of diethyl ether is 07137 g ml-1