1. Van der Waal’s forces are effective
a. At long distances
b. both at long and short distances
c. only at short distance
d. In dependent of distance
2. Which of following forces are also called London forces
a. ion-dipole forces
b. dipole induced dipole forces
c. dipole dipole forces
d. dispersion forces
3. Which of following two halogens are gases at room temperature
a. F and I
b. Cl and Br
c. F and Cl
d. I and Br
4. The intermolecular forces are of …types
a. two
b. three
c. four
d. five
5. Thermostat is an instrument which
a. increase the temperature
b. decrease the temperature
c. maintains the temperature
d. fluctuate the temperature
6. The scientist who discovered the phenomena of viscosity are
a. Poisuelle
b. Newton
c. Fritz
d. Vander Wall
7. The distillation under reduced pressure is called
a. fractional distillation
b. steam distillation
c. pressure distillation
d. vacuum distillation
8.The unit of surface tension is
a. Newton per meter
b. Newton per meter square
c. 760mmHg
d. Newton square per meter
9. The immediate phase lying between the solid phase and the normal liquid phase is called
a. crystalline solid
b. liquid crystals
c. mesogens
d. crystal lattice
10. In which of following are particles most disordered
a. water at 100oC
b. steam at 100oC
c. impure water at 102oC
d. water at 10oC
11. Which of these statements best supports the idea that matter is made up of particles
a. liquids always fills the space available to them
b. liquids are easily compressible
c. 1 cm3 of water produces nearly 1700 cm3 of steam
d. if a bottle of perfume is opened , the smell spreads quickly
12.Which of these processes involve a weakening of the attraction between particles
a. freezing
b. evaporation
c. condensation
d. crystallization
13. A liquid is thought to be pure ethanoic acid , which of following is the best way to test its purity
a. measures its B.P
b. react it with ethanol
c. burn it completely in oxygen
d. dehydrate it with conc H2So4
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