Which of the following are correct statements

Engineering

Chemistry

Adsorption

Gold Number and Flocculation value

Colloids Preparation and Properties

Question

Which of the following are correct statements

A colloid of Fe(OH)₃ is prepared by adding a little excess (required to completely precipitate Fe³⁺ ions as Fe(OH)₃)) of NaOH in FeCl₃ solution the particles of this sol will more towards cathode during electrophoresis.

According to Hardy-Schulze rules the coagulation (flocculating) value of Fe³⁺ ion will be more than Ba²⁺ or Na⁺.

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

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

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⇒ ΔG = ΔH – TΔS < O as ΔS < O so ΔH has to be negative

⇒ micelles formation will take place above T_k and above CMC

⇒ this solution will be negatively charged.

⇒ Fe³⁺ ions will have greater flocculatibility power so smaller flocculating value.