Topic: UNIT 10: Chemical bonding (Test 1)



Topic: UNIT 10: Chemical bonding
Q.1
The percentage of s-character of the hybrid orbitals in methane, ethane, ethene and ethyne are respectively
A. 25, 25,33.3,50
B. 50,50,33.3,25
C. 50,25,33.3,50
D. 50,25,25,50
Answer : Option A
Explaination / Solution:



Workspace
Report
Q.2
Of the following molecules, which have shape similar to carbondixide?
A. SnCl2
B. NO2
C. C2H2
D. All of these
Answer : Option C
Explaination / Solution:

Co2 - Linear

C2H2 - Linar 


Workspace
Report
Q.3
According to VSEPR theory, the repulsion between different parts of electrons obey the order
A. l.p – l.p > b.p–b.p> l.p–b.p
B. b.p–b.p> b.p–l.p> l.p–b.p
C. l.p–l.p> b.p–l.p > b.p–b.p
D. b.p–b.p> l.p–l.p> b.p–l.p
Answer : Option C
Explaination / Solution:
No Explaination.


Workspace
Report
Q.4
Shape of ClF3 is
A. Planar triangular
B. Pyramidal
C. 'T' Shaped
D. none of these
Answer : Option C
Explaination / Solution:

ClF3 - Sp3d hybridisation, 'T' shaped 

Workspace
Report
Q.5
Non- Zero dipole moment is shown by
A. CO2
B. p-dichlorobenzene
C. carbontetrachloride
D. water
Answer : Option D
Explaination / Solution:



Workspace
Report
Q.6
Which of the following conditions is not correct for resonating structures?
A. the contributing structure must have the same number of unpaired electrons
B. the contributing structures should have similar energies
C. the resonance hybrid should have higher energy than any of the contributing structure
D. none of these
Answer : Option C
Explaination / Solution:

Correct statement is - the resonance hybrid should have lower energy than any of the contributing structure

Workspace
Report
Q.7
Among the following, the compound that contains, ionic, covalent and Co-ordinate linkage is
A. NH4Cl
B. NH3
C. NaCl
D. none of these
Answer : Option A
Explaination / Solution:
No Explaination.


Workspace
Report
Q.8
CaO and NaCl have the same crystal structure and approximately the same radii. It U is the lattice energy of NaCl, the approximate lattice energy of CaO is
A. U
B. 2U
C. U/2
D. 4U
Answer : Option D
Explaination / Solution:
No Explaination.


Workspace
Report
Q.9
In which of the following Compounds does the central atom obey the octet rule?
A. XeF4
B. AlCl3
C. SF6
D. SCl2
Answer : Option D
Explaination / Solution:

Compound  : No. of valance electron on the central atom

XeF2 : 10

AlCl3 : 6

SF6 : 12

SCl2 : 8 


Workspace
Report
Q.10
In the molecule OA == C==OB, the formal charge on OA, C and OB are respectively.
A. -1, 0, + 1
B. +1, 0,-1
C. -2,0,+2
D. 0,0,0
Answer : Option D
Explaination / Solution:



Workspace
Report