TNPSC Chemistry - Solutions and Surface Chemistry
Exam Duration: 45 Mins Total Questions : 30
If glycerol and methanol were sold at the same price in market, which would be cheaper for preparing an anti-freeze solution for the radiator of an automobile?
- (a)
Glycerol
- (b)
Methanol
- (c)
Both are equal
- (d)
None of these
Colloidal solution commonly used in the treatment of eye disease is
- (a)
colloidal silver
- (b)
colloidal gold
- (c)
colloidal antimony
- (d)
colloidal sulphur
Water is a good solvent. This is due to high
- (a)
Dielectric constant of water
- (b)
surface tension of water
- (c)
specific heat of water
- (d)
heat of fusion of water
Which of the following colloidal solution is commonly used as germ killer?
- (a)
Colloidal sulphur
- (b)
Colloidal gold
- (c)
Colloidal silver
- (d)
Colloidal antimony
An emulsion is a colloid of a
- (a)
gas in a liquid
- (b)
liquid in a liquid
- (c)
liquid in a gas
- (d)
gas in a solid
Fog is an example of
- (a)
gas dispersed in gas
- (b)
liquid dispersed in gas
- (c)
solid dispersed in gas
- (d)
solid dispersed in liquid
Which of the following properties are characteristic of lyophobic sols?
1. Low viscosity
2. High viscosity
3. Reversibility
4. Coagulation by electrolytes at low concentrations
Select the correct answer using the code given below.
- (a)
1, 3 and 4
- (b)
2 and 3 only
- (c)
1 and 4 only
- (d)
1 and 3 only
Match the Column I with the Column II.
| Column I | Column II |
| A. Rain cloud | 1. Sol |
| B. Milk of magnesia | 2. Foam |
| C. Whipped cream | 3. Micelles |
| D. Soap in water | 4. Aerosol |
- (a)
A B C D 4 1 2 3 - (b)
A B C D 1 2 3 4 - (c)
A B C D 2 3 4 1 - (d)
A B C D 3 4 1 2
Match the Column I with the Column II.
| Column I | Column II |
| A. Tyndall effect | 1. Dispersion of finely divided droplets in another liquid |
| B. Brown movement | 2. Flocculation and settling down of the discharged sol particles. |
| C. Coagulation | 3. Zig-zag movement executed by a colloidal particle in the dispersion medium. |
| D. Emulsion | 4. Scattering of light by the particles. |
- (a)
A B C D 1 4 3 2 - (b)
A B C D 4 3 2 1 - (c)
A B C D 3 4 2 1 - (d)
A B C D 2 1 4 3
The solubility of a gas in liquid increases with
- (a)
increase in temperature
- (b)
reduction in gas pressure
- (c)
Decrease in temperature and increase in gas pressure
- (d)
amount of liquid taken
Soaps cannot be used in acidic condition because of they lose their cleansing effect due to formation of insoluble
- (a)
esters
- (b)
alcohols
- (c)
hydrocarbons
- (d)
long-chain fatty acids
Isotonic solutions have the some
- (a)
normality
- (b)
molar concentration
- (c)
strength
- (d)
density
Consider the following
At constant pressure, boiling point of a solution id greater than the boiling point of its pure liquid solvent because
1. solute is non-electrolyte.
2. solute is non-volatile.
3. chemical potential of solvent in solution is less than the chemical potential of solvent in its pure state at constant pressure.
Which of the above are correct?
- (a)
1, 2 and 3
- (b)
1 and 2 only
- (c)
1 and 3 only
- (d)
2 and 3 only
Which of the following statements are valid for a solution containing a non-volatile solute?
1. The solution exhibits a lower vapour pressure than that of the pure solvent.
2. The solution exhibits a higher vapour pressure than that of the solvent.
3. The freezing point of the solution in less than that of the solvent.
4.The freezing point of the solution is more than that of the solvent.
Select the correct answer using the codes given below.
- (a)
1 and 4
- (b)
1 and 3
- (c)
2 and 3
- (d)
2 and 4
When blood cells are placed in a solution of KCL whose osmotic pressure is greater than that of the cell fluid, there occurs
- (a)
shrinking in size of the cell
- (b)
increase in size of the cell
- (c)
no change in size
- (d)
first shrinking and then regaining of original size
Assertion (A) In osmosis, solvent molecules pass through a semi-permeable membrane from a more dilute solution to a more concentrated one, when the two are separated by the semi-permeable membrane.
Reason (R) The vapour pressure of the over the dilute solution is less than that over the concentrated solution.
- (a)
Both A and R are individually true and R is the correct explanation of A
- (b)
Both A and R are individually true, but R is not the correct explanation of A
- (c)
A is true, but R is false
- (d)
A is false, but R is true
The solution of rubber is an example of
- (a)
lyophobic colloid
- (b)
multimolecular colloid
- (c)
associated colloid
- (d)
macromolecular colloid
Consider the following statements
1. Azeotropic mixtures are constant temperature boiling mixture.
2. Azeotropic mixtures are those which boils at different temperatures.
3. Azeotropic mixture of two solids
Which of the above is/are true?
- (a)
Only 1
- (b)
Only 2
- (c)
Only 3
- (d)
1, 2 and 3
Consider the following statements.
1. The water drop in vacuum is perfectly spherical.
2. The shape of water drop id distorted due to action of gravity.
3. Soaps and detergents drastically decreased the surface tension of water.
4. As temperature increases, surface tension also increases and becomes maximum at critical temperature.
Which of the above are correct?
- (a)
1, 2, 3, 4
- (b)
2, 3, 4
- (c)
1, 2, 3
- (d)
1, 3
If detergent is added
- (a)
surface tension decreases
- (b)
surface tension increases
- (c)
surface tension can increase or decrease
- (d)
no effect
A solution which contains the maximum amount of the solute that can be dissolved in a given amount of solvent at a particular temperature is called
- (a)
saturated solution
- (b)
unsaturated solution
- (c)
supersaturated solution
- (d)
None of the above
Match the Column I with Column II.
| Column I | Column II |
| A. Lyophilic | 1. Movement of colloidal particle under the influence of electric field |
| B. Dialysis | 2. Formation of colloid from suspension |
| C. Peptization | 3. Separating a crystalloid from a colloid filtration |
| D. Electrophoresis | 4. Solvent loving colloids |
- (a)
A B C D 4 3 2 1 - (b)
A B C D 3 2 1 4 - (c)
A B C D 2 1 4 3 - (d)
A B C D 1 4 3 2
Blood cells do not shrink in blood because blood is
- (a)
isotonic
- (b)
hypertonic
- (c)
hypotonic
- (d)
equimolar
Aritificial rain is caused by spraying
- (a)
similar charged colloidal dust over a cloud
- (b)
neutral charged colloidal dust over a cloud
- (c)
Both (a) and (b)
- (d)
opposite charged colloidal dust over a cloud
Medicines are more effective, if they are used in
- (a)
gaseous
- (b)
colloidal state
- (c)
solid state
- (d)
solution state
Muddy water is purified by adding alum due to
- (a)
osmosis
- (b)
emulsification
- (c)
coagulation
- (d)
dialysis
Consider the statements.
1. During the pressure of osmosis, the solvent from the concentrated solution to the dilute solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.
Which of the statement(s) given above is/are correct?
- (a)
Only 1
- (b)
2 Only
- (c)
Both 1 and 2
- (d)
Neither 1 nor 2
Which one of the following statements is not correct?
- (a)
The boiling point of an aqueous solution is highter than that of pure water
- (b)
Addition of solution to a solution causes an increase in its water potential
- (c)
The vapour pressure of the water in a solution is lower that of pure water
- (d)
When a solution is separated from water by a semi-permeable membrane water movement
Which one of the following colloidal systems in represented by soda water?
- (a)
Liquid in gas
- (b)
Gas in liquid
- (c)
Solid in gas
- (d)
Liquid in liquid
Farmers are requested to mix lime with soil while farming their fields. This is because
- (a)
Lime is very helpful in maintaining the water content in the soil.
- (b)
Lime decreases the acidity of soil
- (c)
lime decreases the basicity of soil
- (d)
high concentration of lime is necessary for the plant growth
