Question

$FeC{l_3}$ sol in hot water mixed with conc. $NaOH$ is?
a.) Positively charged colloid
b.) Negatively charged colloid
c.) Both (+) and (−) charged
d.) All of these

Answer 1

On the off chance that $FeC{l_3}$ is added to the abundance of boiling water, a decidedly charged sol pf hydrated ferric oxide is framed because of adsorption of $F{e^{3 + }}$ particles. Be that as it may, when ferric chloride is added to NaOH a contrarily accused sol is acquired of adsorption of $O{H^ - }$ particles.

Complete step by step answer: At the point when $FeC{l_3}$ sol is treated with boiling water, it structures $Fe{(OH)_3}$ shaping $F{e^{3 + }}$ ions(in overabundance sum) and these positive particles are adsorbed specially. Further, when $NaOH$ is blended, again there is the development of $Fe{(OH)_3}$ yet now $O{H^ - }$ particles are in abundance. Subsequently, they will get specially adsorb and structure adversely charged.
The correct answer is option “D” .

Additional Information :
- What is Ferric Chloride?
Ans: It is an iron coordination element that capacities as an astringent and Lewis corrosive. The substance equation of Ferric Chloride is $FeC{l_3}$ . Molysite arrangement is lackluster to light brown and has a weak hydrochloric corrosive smell. It is destructive to most metals and tissues. It is non-burnable and is generally utilized in water cleaning and sewage treatment. In its anhydrous structure, it is deliquescent. Likewise, fractional hydrolysis happens as it retains water from the air and frees hydrogen chloride that structures fogs in clammy air. It is a solid Lewis acid.

- What is the Ferric Chloride Test?
Ans: This test is directed to decide the presence or nonattendance of phenol in a given example. Mixes, for example, enols, hydraemic acids, sulfinic acids, and oximes give positive outcomes. The amount of phenol in the example can be estimated by the Folin-Ciocalteu test.
Stage 1: Break up the example in water in addition to ethanol.
Stage 2: Add drops of a weakened arrangement of ferric chloride $FeC{l_3}$
Stage 3: In the event that the example goes to red, green, purple, or blue coloration then it demonstrates the presence of phenols.
Stage 4: in the event that the example is insoluble in water, it tends to be broken down in dichloromethane with a little amount of pyridine.

Note: Ferric Chloride is utilized in natural blends as an impetus. It is utilized to treat over trimming of creature hooks particularly when the over-editing prompts dying. It is utilized as a drying reagent in certain responses in its anhydrous structure. It has wide applications in energy stockpiling frameworks.