Surface Chemistry

Which one is an example of heterogeneous catalysis?

1. Hydrolysis of sugar catalysed by H+ ions.
2. Decomposition of ozone in presence of nitrogen monoxide.
3. Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.
4. Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.

Pumice stone is an example of -

1. gel
2. solid sol
3. foam
4. sol

Given below are two statements In the light of the above statements, choose the most appropriate answer from the options given below

1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.

Shown below are adsorption isotherms for a gas 'X' at temperatures T1, T2 and T3 : [figure] p and xm represent pressure and extent of adsorption, respectively. The correct order of temperatures for the given adsorption is :

1. T1 = T2 > T3
2. T1 > T2 > T3
3. T3 > T2 > T1
4. T1 = T2 = T3

The right option for the statement "Tyndall effect is exhibited by", is :

1. Urea solution
2. NaCl solution
3. Glucose solution
4. Starch solution

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.