1) Which is an example of intramolecular force? 
a. covalent bond
b. ionic bond
c. hydrogen bonding
d. both A and B
 

1.  The weak attractions between nonpolar molecules. 
   a. dipole-dipole
   b. ion-dipole
   c. hydrogen bonding
   d. london dispersion
    
2.  Interaction where in the partially positive end of a molecule contains a hydrogen atom. 
   a. ion-dipole
   b. dipole-dipole
   c. hydrogen bonding
   d. london dispersion
    
3.  A force between an ion and a polar molecule. 
   a. ion-dipole
   b. dipole-dipole
   c. hydrogen bonding
   d. london dispersion
    
4.  Collective term given to weak intermolecular forces 
   a. ion - ion forces
   b. london dispersion forces
   c. van der Waals forces
   d. dipole - dipole forces
    
5.  Which of the following can result in a London dispersion force? 
   a. When a non-polar molecule becomes slightly polar for an instant
   b. When the oppositely charged ends of a polar molecule attract each other
   c. When an ion comes close enough to a non-polar molecule to change its electron density.
   d. When there is an extraordinarily strong dipole-dipole attraction between an hydrogen atom and a polar molecule.
    
6.  Substances with weaker intermolecular attraction have 
   a. Higher melting point and lower boiling point
   b. Lower melting point and higher boiling point
   c. Higher melting point and boiling point
   d. Lower melting point and boiling point
    
7.  Which of the following interaction has the highest boiling point?  
   a. H2 - H2
   b. NH3 - NH3
   c. NaCl - H2O
   d. LiBr - LiBr
8.  Which of the following has the weakest interaction? 
   a. He2 - He2
   b. HF - HF
   c. C12H22O11 - H2O
   d. NaCl - NaCl
    
9.  Which of the following has correct order of intermolecular forces in increasing attraction? 
   a. ion-ion < dipole-dipole < ion-dipole < london dispersion < hydrogen bonding
   b. london dispersion < ion-dipole < dipole-dipole < hydrogen bonding < ion-ion
   c. london dispersion < dipole-dipole < hydrogen bonding < ion-dipole < ion-ion
   d. dipole-dipole < ion-dipole < hydrogen bonding < london dispersion < ion-ion

1) d. both A and B 

2) d. London dispersion

3) c. hydrogen bonding

4) a. ion-dipole

5) c. van der Waals forces

6) a. When a non-polar molecule becomes slightly polar for an instant

7) d. Lower melting point and boiling point

8) d. LiBr - LiBr

9) a. He2 - He2

10)  c. london dispersion < dipole-dipole < hydrogen bonding < ion-dipole < ion-ion

Step-by-step explanation

1) Intramolecular force are the force that holds together the atoms making up a molecule or compound. Examples of intramolecular forces are chemical bonds such as ionic, covalent and metallic bonds.

2) The intermolecular force of attraction between non-polar molecules is called dispersion force. Also called London dispersion force.

3) A hydrogen bond is the electromagnetic attraction created between a partially positively charged hydrogen atom attached to a highly electronegative atom and another nearby electronegative atom. A hydrogen bond is a type of dipole-dipole interaction 

4) An ion-dipole force consists of an ion and a polar molecule aligning so that the positive and negative charges are next to one another, allowing for maximum attraction. Ion-dipole forces are generated between polar water molecules and a sodium ion.

5) Intermolecular attractive forces, collectively referred to as van der Waals forces, are the weak intermolecular force.  Dispersion forces are also considered a type of van der Waals force.

6) London dispersion force occur between any adjacent pair of atoms or molecules when they are present in sufficiently close proximity. These interactions account for the attractive forces between nonionic and nonpolar organic molecules.

7) Because intermolecular forces increase the bonding strength between two or more molecules, intermolecular forces can impact the melting and boiling points of compounds. In general, as intermolecular force strength increases, the melting and boiling points of a substance also increase. Substances with weak intermolecular forces also have low surface tension . So, boiling points  and melting point are lower for substances with weak intermolecular forces.

8) LiBr is an ionic compound, which is ionic bonds which are stronger than any type of intermolecular forces. So, it has high boiling point.

9)  Helium is a non-polar gas. So, weak van der Waals force exist between two helium. Pairs of helium atoms are bound by a much weaker attraction known as the van der Waals force, caused by fleeting imbalances of the two atoms' electric charges

10)  london dispersion < dipole-dipole < hydrogen bonding < ion-dipole < ion-ion