Chemistry - Chemical Bonding
Exam Duration: 45 Mins Total Questions : 30
A pi bond
- (a)
is formed by end to end overlapping of orbitals
- (b)
is formed by lateral overlapping of orbitals
- (c)
is formed by overlapping of orbitals along their internuclear axis
- (d)
determines the direction and extent of internuclear distance
Electrovalent compounds
- (a)
have low m.p
- (b)
have low b.p
- (c)
conduct electricity in molten state
- (d)
are insoluble in polar solvents
If there are three shared pairs of electrons and one lone pair around the central atom in a covalent molecule,the shape of the molecule is
- (a)
tetrahedral
- (b)
trigonal pyramidal
- (c)
octahedral
- (d)
triangular
The pair of elements which forms a compound with maximum ionic character is
- (a)
Na and C
- (b)
Cs and F
- (c)
Cs and I
- (d)
Na and C
On the basis of MO theory which one of the following species does not exist?
- (a)
\({ He }_{ 2 }^{ +2 }\)
- (b)
\({ He }_{ 2 }\)
- (c)
\({ He }_{ 2 }^{ +1}\)
- (d)
\({ Li }_{ 2 }^{ +1 }\)
Which of the following species contains non-directional bond?
- (a)
NH3
- (b)
CsCl
- (c)
NH4
- (d)
BeF2
In the resonating structure of benzene the number of \(\sigma\) and \(\pi\) bonds are
- (a)
3\(\pi\) and 12\(\sigma\)
- (b)
3\(\sigma\) and 12\(\pi\)
- (c)
6\(\pi\) and 6\(\sigma\)
- (d)
12\(\pi\) and 12\(\sigma\)
For which of the following hybridisations the bond angle is maximum?
- (a)
sp2
- (b)
sp
- (c)
sp3
- (d)
dsp2
Delocalised molecular orbitals are found in
- (a)
H2
- (b)
HS-
- (c)
CH4
- (d)
CO32-
The electronic configuration of metal M is 1s22s22p63s1.The formula of its oxide will be
- (a)
MO
- (b)
M2O
- (c)
M2O3
- (d)
MO2
The hybrid state of carbon in diamond,graphite and acetylene is in the order of
- (a)
sp3,sp,sp2
- (b)
sp3,sp2,sp
- (c)
sp,sp2,sp3
- (d)
sp2,sp3,sp
Which of the following has unchanged valency?
- (a)
H
- (b)
Na
- (c)
Fe
- (d)
oxygen
NH3 and BF3 form adduct readily because they form
- (a)
ionic bond
- (b)
covalent bond
- (c)
co-ordinate bond
- (d)
hydrogen bond
In the reasoning structure of benzene,the number of \(\sigma\) and \(\pi\) bonds are:
- (a)
3\(\pi\) and 12\(\sigma\)
- (b)
3\(\sigma\) and 12\(\pi\)
- (c)
6\(\pi\) and 6\(\sigma\)
- (d)
12\(\pi\) and 12\(\sigma\)
Which is the most ionic?
- (a)
P2O5
- (b)
MnO
- (c)
CrO3
- (d)
Mn2O7
Covalent compounds are soluble in
- (a)
Polar solvents
- (b)
Non-polar solvents
- (c)
Concentrated acids
- (d)
All solvents
Which of the following bonds is the most ionic ?
- (a)
Cs-Cl
- (b)
Al-Cl
- (c)
C-Cl
- (d)
H-Cl
The hydrogen bond is strongest in
- (a)
O-H....O
- (b)
S-H....S
- (c)
F-H....F
- (d)
F-H....O
Dipole moment is shown by
- (a)
1,4-dichlorobenzene
- (b)
cis,1,2-dichloethane
- (c)
tras,1,2-dichloethene
- (d)
trans 2,3-dichloro-2-butene
Two elements have electronegativities of 1.2 and 3.0. Bond formed between them would be
- (a)
Ionic
- (b)
Polar covalent
- (c)
Co-ordinate
- (d)
Metallic
The correct order of decreasing polarity is
- (a)
HF>SO2>H2O>NH3
- (b)
HF>H2O>SO2>NH3
- (c)
HF>NH3>SO2>H2O
- (d)
H2O>NH3>SO2>HF
Which of the following options represents the correct bond order?
- (a)
\({ O }_{ 2 }^{ - }>{ O }_{ 2 }>{ O }_{ 2 }^{ + }\)
- (b)
\({ O }_{ 2 }^{ - }<{ O }_{ 2 }<{ O }_{ 2 }^{ + }\)
- (c)
\({ O }_{ 2 }^{ - }>{ O }_{ 2 }<{ O }_{ 2 }^{ + }\)
- (d)
\({ O }_{ 2 }^{ - }<{ O }_{ 2 }>{ O }_{ 2 }^{ + }\)
Which of the following molecule will be stabilised by loosing one electron from its HOMO?
- (a)
C2
- (b)
N2
- (c)
CN
- (d)
O2
The correct statement for the molecule, CsI3 is
- (a)
It is a covalent molecule
- (b)
It contains Cs+ and I3- ions
- (c)
It contains Cs3+ and I- ions
- (d)
It contains Cs+, I- and lattice I2 molecule
In which of the following ionisation processes, the bond order has increased and the magnetic behaviour has changed?
- (a)
\({ C }_{ 2 }\rightarrow { C }_{ 2 }^{ + }\)
- (b)
\(NO\rightarrow { NO }^{ + }\)
- (c)
\({ O }_{ 2 }\rightarrow { O }_{ 2 }^{ + }\)
- (d)
\({ N }_{ 2 }\rightarrow { N }_{ 2 }^{ + }\)