Question

Which of the following statements given about emulsions is incorrect?

• A. The droplets in emulsions are often negatively charged and can be precipitated by electrolytes.
• B. Emulsion can be diluted with any amount of the dispersed liquid. On the other hand, the dispersion medium when mixed, forms a separate layer.
• C. Emulsions can be broken into constituent liquids by heating, freezing, centrifuging, etc.
• D. Emulsions also show Brownian movement and Tyndall effect.

Answer 1

The correct option is B Emulsion can be diluted with any amount of the dispersed liquid. On the other hand, the dispersion medium when mixed, forms a separate layer.

• Emulsions are liquid-liquid colloidal systems, i.e., the dispersion of finely divided droplets in another liquid.
  
• If a mixture of two immiscible or partially miscible liquids is shaken, a coarse dispersion of one liquid in the other is obtained which is called an emulsion.
  
• In emulsions, the droplets present are often negatively charged and can be precipitated by electrolytes.
• Emulsions can be broken down into its constituents by heating, freezing, centrifuging etc.
• Emulsions being a colloid shows both Tyndall effect and Brownian motion.

Hence, option $B$ is incorrect.