Which of the following is a lyophobic colloidal solution ?
A. Aqueous starch solution
B. Aqueous protein solution
C. Gold sol
D. Polymer solutions in some organic solvents
Which of the following biomolecules acts as specific catalysts in biological reaction
A. Carbohydrates
B. Lipids
C. Vitamins
D. Enzymes
The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :
A. solid, solid, lyophobic
B. liquid , liquid , lyophobic
C. solid, liquid, lyophobic
D. solid, liquid, lyophilic
If a solid is dispersed in a liquid the colloid is called
A. Lyosol
B. Emulsion
C. Gel
D. Acrosol
One atom of 3919K contains:
A. 19p;20n and 19e-
B. 19p;20n and 20e-
C. 20p;19n and 20e-
D. 20p;19n and 19e-
Gold number is used to show
A. Protective power of lyophillic colloids
B. Protective power of lyophobic colloid
C. Peptisation power of a colloid
D. Precipitation power of a colloid
In Freundlich adsorption isotherm, the intercept is equal to
A. k
B. log k
C. 1/n
D. log x/m
The nature of forces operating between the adsorbate and the adsorbent in the adsorption occurring at high temperature is
A. Vander waals forces
B. Chemical forces
C. Gravitational forces
D. Fermi forces
The gold numbers of three protective colloids A, B, and C are 0.05, 0.01 and 0.5 respectively. The decreasing order of their protective power is:
A. B, C, A
B. A, B, C
C. B, A, C
D. C, A, B
The decomposition of H2O2 may be decreased by adding a small quantity of glycerol.This is an example of
A. Neutralisation
B. Negative catalysis
C. Positive catalysis
D. Catalytic poisoning
The gold numbers of three protective colloids A, B, and C are 0.05, 0.01 and 0.5 respectively. The decreasing order of their protective power is
A. B, C, A
B. A, B, C
C. B, A, C
D. C, A, B