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WorksheetsCHEMICAL BONDING JEE
Total questions: 20
Worksheet time: 10mins
The bond dissociation energy of B–F in BF3 is 646 kJ mol-1 whereas that of C–F in CF4 is 515 kJ mol–1. The correct reason for higher B–F bond dissociation energy as compared to that of C–F is
Significant pπ – pπ interaction between B and F in BF3 whereas there is no possibility of such interaction between C and F in CF4.
Lower degree of pπ – pπ interaction between B and F in BF3 than that
between C and F in CF4
Smaller size of B-atom as compared to that of C-atom
Stronger bond between B and F in BF3 as compared to that between C and F in CF4.
Among the following species which two have a trigonal bipyramidal shape?
(1) NI3 (2) I3– (3) SO32- (4) NO3–
II and III
III and IV
I and IV
I and III
Using MO theory, predict which of the following species has the shortest bond length?
O2–
O22-
O22+
O2+
Among the following, the species having the smallest bond is :
NO
NO+
O2
NO–
The hybridisation of orbitals of N atom in NO3–, NO2+, NH4+ are respectively:
sp2, sp3, sp
sp, sp3, sp2
sp, sp2, sp3
sp2, sp, sp3
Based on lattice energy and other considerations, which one of the following alkali metal chlorides is expected to have the highest melting point?
RbCl
LiCl
KCl
NaCl
The structure of IF7 is :
octahedral
pentagonal bipyramid
square pyramid
trigonal bipyramid
Which of the following has the square planar structure :
NH4+
CCl4
XeF4
BF4–
Among the following the maximum covalent character is shown by the compound :
AlCl3
MgCl2
FeCl2
SnCl2
The compound of Xenon with zero dipole moment is :
XeO3
XeO2
XeF4
XeOF4
Which of the following has a maximum number of lone pairs associated with Xe?
XeO3
XeF4
XeF6
XeF2
Among the following the molecule with the lowest dipole moment is :
CHCl3
CH2Cl2
CCl4
CH3Cl
The number of types of bonds between two carbon atoms in calcium carbide is
One sigma, two pi
One sigma, one pi
Two sigma, one pi
Two sigma, two pi
The formation of molecular complex BF3 – NH3 results in a change in the hybridisation of boron
From sp3 to sp3d
From sp2 to dsp2
From sp3 to sp2
From sp2 to sp3
The molecule having the smallest bond angle is :
PCl3
NCl3
AsCl3
SbCl3
In which of the following pairs the two species are not isostructural?
AlF63- and SF6
CO32- and NO3–
PCl4+ and SiCl4
PF5 and BrF5
Which one of the following molecules is expected to exhibit diamagnetic behaviour?
C2
N2
O2
S2
Stability of the species Li2, Li2– and Li2+ increases in the order of :
Li2 < Li2+ < Li2–
Li2– < Li2+ < Li2
Li2 < Li2 < Li2+
Li2– < Li2 < Li2+
In which of the following pairs of molecules/ions, both species are not likely to exist?
H2+, He22-
H2–, He22-
H22+, He2
H2–, He22+
Bond distance in HF is 9.17 × 10-11m. Dipole moment of HF is 6.104 × 10–30 Cm. The per cent ionic character in HF will be : (electron charge = 1.60 × 10-19 C)
61.0%
38.0%
35.5%
41.5%
