Which one of the following is correct?

Which one of the following is correct?
  1. $\mathrm{As}_2 \mathrm{~S}_3$ is a positively charged sol.
  2. The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude to observe Tyndall effect.
  3. Ultra microscope provides information about the size and shape of colloidal particles.
  4. Finest gold sol is green in colour.

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (26 Apr Shift 2)

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