Which of the following are correct statements?

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Spontaneous adsorption of gases on solid surface is an exothermic process as entropy decreases during adsorption

Formation of micelles takes place when temperature is above Kraft Temperature (T_K) and concentration is above critical micelle concentration (CMC)

A colloid of $Fe (OH)_{3}$ is prepared by adding a little excess (required to completely precipitate ${Fe}^{3 +}$ ions as $Fe (OH)_{3} of NaOH in {FeCl}_{3}$ solutions

According to Hardy-Schulze rules the coagulation (flocculating) value of Fe³⁺ ion will be more than ${Ba}^{2 +} or {Na}^{+}$

answer is A.

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Detailed Solution

(a) $∆$ G = $∆$ H -T $∆$ S <0

$∆$ S <0 so $∆$ H is always negative

(b)If FeCl₃ is added to excess of hot water, a positively charged sol of
hydrated ferric oxide is formed due to adsorption of Fe³⁺ ions. However,
when ferric chloride is added to NaOH a negatively charged sol is
obtained with adsorption of OH^- ions.
(c) The sol. will be negative charge

(d) More the charge on cation ,higher the coagulating power.

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