Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2004ChemistrySurface ChemistryActual

Assertion : Aqueous gold colloidal solution is red in colour. Reason : The colour arises due to scattering of light by colloidal gold particles.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

The colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles. The wavelength of light further depends on the size and nature of the particles. The colour of colloidal solution also changes with the way the observer receives the light. Finest gold sol is red in colour. As size of the particles increases, it becomes purple, then blue and finally golden yellow.

Practice Surface Chemistry on Quantrex Academy →

More from Surface Chemistry

Which of the following is a positively charged sol? 2023Pumice stone is an example of 2023Which one is an example of heterogenous catalysis? 2023Shown below are adsorption isotherms for a gas ' X ' at temperatures T ₁, ~T ₂ and T ₃ : p and x m represent pressure and extent of adsorption, respectively. The correct order of t 2022Given below are two statements : Statement I : In the coagulation of a negative sol, the flocculating power of the three given ions is in the order - Al 3 + > Ba 2 + > Na + 2022The right option for the statement "Tyndall effect is exhibited by", is: 2021Measuring Zeta potential is useful in determining which property of colloidal solution? 2020In which of the sols, the colloidal particles are with negative charge? 2020 Full Surface Chemistry list All NEET PYQs