The optimum temperature range for enzymatic activity is 298-310 K, i.e., enzymes are inactive beyond this temperature range (high or low).

Thus, during fever (temperature $>310 \mathrm{~K}$ ) the activity of enzymes may be affected.

A. $\rightarrow(2)$ B. $\rightarrow$ (3) C. $\rightarrow$ (4) D. $\rightarrow$ (1)

A. When sulphur vapours passed through cold water it leads to formation of molecular colloids.

B. When soap is mixed with water above critical micelle concentration it lead to formation of associated colloids.

C. White of egg whipped with water is an example of macromolecular colloids in which high molecular mass proteneous molecule acts as a colloidal particle.

D. Soap mixed with water below critical micelle concentration is known as normal electrolyte solution.

A. $\rightarrow(3)$ B. $\rightarrow$ (4) C. $\rightarrow$ (2) D. $\rightarrow$ (1)

A. Dispersion medium moves in an electric field is known as electroosmosis.

B. Solvent molecules pass through semipermeable membrane towards solvent side is known as reverse-osmosis.

C.Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charge electrodes is known as electrophoresis.

D. Solvent molecules pass through semipermeable membranes towards solution side is known as osmosis.

A. $\rightarrow(2)$ B. $\rightarrow$ (3) C. $\rightarrow(4)$ D. $\rightarrow$ (1)

A. Lyophobic colloid (solvent hating colloid) are readily protected by small amount of electrolyte. These colloids are also stabilised by addition of lyophilic colloids which makes a protective layer around lyophobic sol. Hence, lyophilic sol are known as protective colloid.

B. Liquid-liquid colloid is also known as emulsion if they are partially miscible or immiscible liquids.

C. When $\mathrm{FeCl}_3$ is added to hot water it lead to the formation of positively charged colloid.

D. When NaOH is added to $\mathrm{FeCl}_3$ it lead to the formation of negatively charged colloid.

A. $\rightarrow(2)$ B. $\rightarrow(3)$ C. $\rightarrow$ (4) D. $\rightarrow$ (1)

Colloids are classified on the basis of types of dispersed phase and dispersion medium.