Which one of the following statements is corr | vedclass

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(B) $1$. $As_2S_3$ is a negatively charged sol,not positively charged. So,option $A$ is incorrect.$2$. For the Tyndall effect to be observed,the refra

Vedclass · Accepted Answer

The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude to observe the Tyndall effect.

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(B) $1$. $As_2S_3$ is a negatively charged sol,not positively charged. So,option $A$ is incorrect.$2$. For the Tyndall effect to be observed,the refractive indices of the dispersed phase and the dispersion medium must differ significantly in magnitude. This is a correct statement.$3$. An ultramicroscope is used to detect the presence of colloidal particles,but it does not provide information about their size and shape. So,option $C$ is incorrect.$4$. The colour of gold sol depends on the size of the particles. The finest gold sol is red in colour,while coarser sols appear purple or blue. So,option $D$ is incorrect.

List $I$	List $II$
$(A)$. Brownian Motion	$(I)$. Removal of impurities from the colloidal sols using a semipermeable membrane.
$(B)$. Tyndall Effect	$(II)$. Movement of colloidal particles under the influence of an electric field.
$(C)$. Electrophoresis	$(III)$. Random movement of colloidal particles due to kinetic energy.
$(D)$. Dialysis	$(IV)$. Scattering of light by colloidal particles

Which one of the following statements is correct?

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