Exercise # 11

PRACTICE QUESTIONS

Exercise # 11

Q1. Hydrogen bonds have a force of

a. 0.5 to 1 kcal/mole

b. 1 to 3 kcal/mole

c. 1 to 8 kcal/mole

d. 100 to 200 kcal/mole

Q2. The forces which are responsible in liquids are

a. Van der waals forces

b. Ion – ion dipole

c. Ion – dipole

d. Debye induction forces

Q3. Solids have forces of what strength?

 a. 0.5 to 1 kcal/mole

b. 1 to 3 kcal/mole

c. 1 to 8 kcal/mole

d. 100 to 200 kcal/mole

Q4. Shear thickening is also known as

a. Pseudoplasticity

b. Dilatancy

c. Plasticity

d. Thixotropy

Q5. Shear thinning is also known as

a. Pseudoplasticity

b. Dilatancy

c. Plasticity

d. Thixotropy

Q6. Nondistinct melting point is seen in

a. Amorphous solids

b. Crystalline solids

c. A & B

d. Polymorphs

Q7. Raoults law defines

a. Vapor Pressure

b.  Boiling point

c. Osmotic pressure

d. Melting point

Q8. The difference in electrical potential between the charged surface of the particle and the dispersion medium is known as

a. Electrokinetic potential

b. Zeta potential

c. A & b

d. Alfa potential

Q9. When Zeta potential is high ( ≥ 25 mV) what happens?

a. Interparticulate repulsive forces exceed attractive forces

b. Dispersion is deflocculated

c. Form strong aggregates

d. All of the above

Q10. When Zeta potential very low what happens?

a. Interparticluate attraction forces predominate

b. Loose particulate aggregates are formed

c. Sedimentaion occurs very fast

d. All of the above

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