Surface Chemistry

Measuring Zeta potential is useful in determining which property of colloidal solution?

1. Solubility
2. Stability of the colloidal particles
3. Size of the colloidal particles
4. Viscosity

Which mixture of the solution will lead to the formation of negatively charged colloidal [AgI] I- sol. ?

1. 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI
2. 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI
3. 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI
4. 50 mL of 1 M AgNO3 + 50 mL of 2 M KI

On which of the following properties does the coagulating power of an ion depend?

1. The magnitude of the charge on the ion alone
2. Size of the ion alone
3. Both magnitude and sign of the charge on the ion
4. The sign of charge on the ion alone

Which one of the following statements is not correct?

1. The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.
2. Enzymes catalyse mainly bio-chemical reactions.
3. Coenzymes increase the catalytic activity of enzyme.
4. Catalyst does not initiate any reaction.

Fog is a colloidal solution of

1. solid in gas
2. gas in gas
3. liquid in gas
4. gas in liquid.

Which one of the following characteristics is associated with adsorption?

1. G and H are negative but S is positive.
2. G and S are negative but H is positive.
3. G is negative but H and S are positive.
4. G, H and S all are negative.

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below : I. (NaCl) = 52, II. (BaCl2) = 0.69, III. (MgSO4) = 0.22 The correct order of their coagulating power is

1. I > II > III
2. II > I > III
3. III > II > I
4. III > I > II

Which property of colloidal solution is independent of charge on the colloidal particles?

1. Electro-osmosis
2. Tyndall effect
3. Coagulation
4. Electrophoresis

Which of the following statements is correct for the spontaneous adsorption of a gas?

1. is negative and, therefore, should be highly positive.
2. is negative and, therefore, should be highly negative.
3. is positive and, therefore, should be negative.
4. is positive and, therefore, should also be highly positive.

Which property of colloids is not dependent on the charge on colloidal particles?

1. Coagulation
2. Electrophoresis
3. Electro-osmosis
4. Tyndall effect