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Substances which alter the velocity of a reaction by mere presence, without undergoing any change in mass and compossition are termed catalyst and the phenomenon is known as catalysis
According to the adsorption theroy of catalysis, the rate of reaction increases because

A

`Fe(OH)_(3)` sol

B

`As_(2)S_(3)` sol

C

Gold sol

D

Starch sol

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The correct Answer is:
A
Level on the cathode side will fall when dispersion medium moves towards anode, i.e., dispersion medium carries `-ve` charge or colloidal particles carry the charge, viz., `Fe(OH)_(3)`
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CENGAGE CHEMISTRY ENGLISH-SURFACE CHEMISTRY-Exercises Link Comprehension
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