Chapter 4
CHEMICAL BONDING AND MOLE STRUCTURE
1. Flourin orbital is formed by
Ans:- The axial p-p orbital overlap
2. Acetylene molecule has carbon in hybridisation
Ans:- sp hybridisation
3. Which of the following has the smallest bond angle
a.NH3
b.BeF2
c.H2O
d.CH
ANS:- H2O
4. Oxygen molecules contains
a. One unpaired electron
b. Two unpaired electron
c. Three unpaired electron
d. No unpaired electron
Ans :- two unpaired electron
5. The comparatively high boiling point of hydrogen fluoride is due to
Ans :- formation of hydrogen bond and consequent association
6. Which one of the following arrangements of molicules is correct on the basis of their dipole moment ?
a. BF3>BN3>NH3
b. BN3 >NH3 >BF3
c. NH3 >NF3 >BF3
Ans:- NH3 >NF3 >BF3
7. The molicular geometry of BF is ......BF
ANS:- Triogonal planar
8. The molicule containing non zero dipole moment is
a. H2O
b. NH3
c. CH4
Ans:- H20
9. " The most electronegative element
in the periodic table is chlorine " this statement is true or False
Ans:-
False , The most electronegative element in the periodic table is Fluorine
10. Observe the relationship between the
first two terms and fill in the blank
Tetrahydral : Sp3
Triogonal : ........
Ans:- Sp3
11. HF ,H2O,o- nitrophenol ,NH3 , ROH, salicylic acid . Classify the above molicules according to the type of hydrogen bond in them
Ans:- intermolicular hydrogen bond :- HF, H2O, NH3, R OH ,
Intramolicular hydrogen bond:- salicylic acid , O -nitro Phenol
12. compare the dipole moment of compound in each of the following sets
a. BF3 and BCl3
b. SO2 and CO2
Ans :'
a. Both BF3 and BCl3 has zero dipole moment due to planar structure
b. SO2 grater dipole moment than CO2
13. Draw the Lewis structure for the following molicules and ions
H2S , BeF2 , HCOOH
Ans:-
14 . Out of O2 and N2 molicules which is expected to have grater bond energy ? Explain why it is so
Ans:- N2 has grater bond energy than O2 . In N2 there's triple bond [N=N] ,Where as in O ,(O=O) as number of bonds increases bond length decreases and bond enthalpy increases
15. Define electron gain enthalpy
Ans:- it is defined as energy released when one mole of neural gaseous atom gain one electron
CHEMICAL BONDING AND MOLE STRUCTURE
1. Flourin orbital is formed by
Ans:- The axial p-p orbital overlap
2. Acetylene molecule has carbon in hybridisation
Ans:- sp hybridisation
3. Which of the following has the smallest bond angle
a.NH3
b.BeF2
c.H2O
d.CH
ANS:- H2O
4. Oxygen molecules contains
a. One unpaired electron
b. Two unpaired electron
c. Three unpaired electron
d. No unpaired electron
Ans :- two unpaired electron
5. The comparatively high boiling point of hydrogen fluoride is due to
Ans :- formation of hydrogen bond and consequent association
6. Which one of the following arrangements of molicules is correct on the basis of their dipole moment ?
a. BF3>BN3>NH3
b. BN3 >NH3 >BF3
c. NH3 >NF3 >BF3
Ans:- NH3 >NF3 >BF3
7. The molicular geometry of BF is ......BF
ANS:- Triogonal planar
8. The molicule containing non zero dipole moment is
a. H2O
b. NH3
c. CH4
Ans:- H20
9. " The most electronegative element
in the periodic table is chlorine " this statement is true or False
Ans:-
False , The most electronegative element in the periodic table is Fluorine
10. Observe the relationship between the
first two terms and fill in the blank
Tetrahydral : Sp3
Triogonal : ........
Ans:- Sp3
11. HF ,H2O,o- nitrophenol ,NH3 , ROH, salicylic acid . Classify the above molicules according to the type of hydrogen bond in them
Ans:- intermolicular hydrogen bond :- HF, H2O, NH3, R OH ,
Intramolicular hydrogen bond:- salicylic acid , O -nitro Phenol
12. compare the dipole moment of compound in each of the following sets
a. BF3 and BCl3
b. SO2 and CO2
Ans :'
a. Both BF3 and BCl3 has zero dipole moment due to planar structure
b. SO2 grater dipole moment than CO2
13. Draw the Lewis structure for the following molicules and ions
H2S , BeF2 , HCOOH
Ans:-
Ans:- N2 has grater bond energy than O2 . In N2 there's triple bond [N=N] ,Where as in O ,(O=O) as number of bonds increases bond length decreases and bond enthalpy increases
15. Define electron gain enthalpy
Ans:- it is defined as energy released when one mole of neural gaseous atom gain one electron
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