Which one of the following statements about enzyme catalysis is incorrect?
1. | Enzymes are mostly proteinous in nature. |
2. | Enzyme action is specific. |
3. | Enzymes are denaturized by ultraviolet rays at high temperatures. |
4. | Enzymes are least reactive at an optimum temperature. |
The protecting power of lyophilic colloidal sol is expressed in terms of:
1. Coagulation value
2. Gold number
3. Critical micelle concentration
4. Oxidation number
If x is the amount of adsorbate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?
1.
2.
3.
4.
The Langmuir adsorption isotherm is deduced using the assumption:
1. | The adsorption takes place in multilayers |
2. | The adsorption sites are equivalent in their ability to adsorb the particles |
3. | The heat of adsorption varies with coverage |
4. | The adsorbed molecules interact with each other |
A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with a slope equal to:
1. log
2. n
3.
4. log 1/k
In the Freundlich adsorption isotherm, the value of 1/n is:
1. Between 0 and 1 in all cases.
2. Between 2 and 4 in all cases.
3. 1 in the case of physical adsorption.
4. 1 in the case of chemisorption.
Which of the following statements is correct for the spontaneous adsorption of a gas?
1. | ∆ S is negative and therefore, ∆ H should be highly positive |
2. | ∆ S is negative and therefore, ∆ H should be highly negative |
3. | ∆ S is positive and therefore, ∆ H should be negative |
4. | -∆ S is positive and therefore, ∆ H 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
Which property of the colloidal solution is independent of charge on the colloidal particles?