Which of the following shows Tyndall effect?

The Correct answer is Colloids.

Key Points

• The Tyndall effect refers to the scattering of light by particles in a medium, making the path of light visible.
• Colloids are mixtures where the particle size ranges between 1 nm to 1000 nm, large enough to scatter light.
• When a beam of light passes through a colloidal solution, the light is scattered, and this phenomenon is called the Tyndall effect.
• Examples of colloids include fog, milk, smoke, and gelatin solutions.
• The particles in a colloid are dispersed in a continuous medium and are not visible to the naked eye, but their effect on light is noticeable.
• The visibility of the light beam in colloids demonstrates the presence of dispersed particles, proving the heterogeneous nature of colloids.

 Additional Information

• Solutions
  • Solutions are homogeneous mixtures where the particle size is smaller than 1 nm.
  • Due to their small particle size, they do not scatter light and hence do not show the Tyndall effect.
  • Examples of solutions include sugar water, salt water, and vinegar.
• Metals
  • Metals are solid substances with a characteristic luster and high electrical and thermal conductivity.
  • They are not mixtures or dispersions and do not exhibit the Tyndall effect.
  • Examples of metals include iron, gold, silver, and copper.
• Gases
  • Gases are composed of particles that are widely spaced and move freely.
  • Pure gases do not exhibit the Tyndall effect as their particles are too small to scatter light significantly.
  • Examples of gases include oxygen, nitrogen, and carbon dioxide.