Point out the false statement:

Options

A. Brownian motion and Tyndall effect are shown by colloidal system
B. The colloidal solution of a liquid in liquid is called emulsion
C. Hardy-Schulze law is related with coagulation of a sol
D. Higher is the gold number, greater will be the protective power of a lyophilic colloid

Explanation

To identify the false statement among the given options related to surface chemistry, we can analyze each statement step by step:

### Step 1: Analyze the first statement
**Statement:** Brownian motion and Tyndall effect are shown by colloidal particles.

**Analysis:** This statement is true. Brownian motion refers to the random movement of colloidal particles suspended in a fluid, which can be observed under a microscope. The Tyndall effect is the scattering of light by colloidal particles, which makes the path of the light visible. Both phenomena are characteristic of colloidal systems.

### Step 2: Analyze the second statement
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