KCET 2021 | Surface Chemistry Question 8 | Chemistry

A colloidal solution is subjected to an electric field than colloidal particles more towards anode. The amount of electrolytes of $$\mathrm{BaCl}_2, \mathrm{AlCl}_3$$ and $$\mathrm{NaCl}$$ required to coagulate the given colloid is in the order

$$\mathrm{NaCl}>\mathrm{BaCl}_2>\mathrm{AlCl}_3$$

$$\mathrm{BaCl}_2<\mathrm{AlCl}_3>\mathrm{NaCl}$$

$$\mathrm{AlCl}_3=\mathrm{NaCl}=\mathrm{BaCl}_2$$

$$\mathrm{AlCl}_3>\mathrm{BaCl}_2>\mathrm{NaCl}$$

KCET 2021

MCQ (Single Correct Answer)

-0

Zeta potential is

potential required to bring about coagulation of a colloidal sol.

potential required to give the particle a speed of $$1 \mathrm{~cm} \mathrm{~s}^{-1}$$

potential difference between fixed charged layer and the diffused layer having opposite charges

potential energy of the colloidal particles.

KCET 2020

MCQ (Single Correct Answer)

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A sol of $$\mathrm{AgI}$$ is prepared by mixing equal volumes of $$0.1 \mathrm{~M} \mathrm{~AgNO}_3$$ and $$0.2 \mathrm{~M} \mathrm{~KI}$$, which of the following statement is correct?

Sol obtained is a negative sol with $$\mathrm{NO}_3^{-}$$ adsorbed on AgI.

Sol obtained is a positive sol with $$\mathrm{Ag}^{+}$$ adsorbed on AgI.

Sol obtained is a positive sol with $$\mathrm{K}^{+}$$ adsorbed on AgI.

$Sol obtained is a negative sol with I$$^-$$ adsorbed on AgI.

KCET 2020

MCQ (Single Correct Answer)

-0

During adsorption of a gas on a solid at low temperature

$$\Delta G<0, \Delta H<0, \Delta S<0$$

$$\Delta G>0, \Delta H>0, \Delta S>0$$

$$\Delta G<0, \Delta H<0, \Delta S>0$$

$$\Delta G<0, \Delta H>0, \Delta S<0$$

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