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A freshly obtained of SnO(2) is peptized...

A freshly obtained of `SnO_(2)` is peptized by little of `KOH` to give a sol. Particles may be represented as

A

`[SnO_(2)]K^(+)`

B

`[SnO_(2)]OH^(-)`

C

`[SnO_(2)]Sn^(4+)`

D

`[SnO_(2)]SnO_(3)^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
D
`SnO_(2)(s)+2KOH_((aq)) to K_(2)SnO_(3)((aq)) + H_(2)O`
`SnO_(3)^(2-)` ions would be preferentially adsorbed by Sno Particles.
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each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: When SnO_(2) is reacted with NaOH , then its sol particles are attracted towards cathode. STATEMENT-2: When SnO_(2) is reacted with NaOH, then it gives SnO_(3)^(2-) which is adsorbed by SnO_(2) , so it is negatively charged sol.

The colloidal particles are electrically charged as a indicated by their migration towards cathode or anode under the applied electric field. In a particular colloidal system, all particles carry either positive charge or negative charge. The electric charge on colloidal particles orginate in several ways. According to preferential adsorption theory, the freshly obtained precipitate particles adsorb ions from the dispersion medium, which are common to their lattice and acquire the charge of adsorbed ions. For example, For example, freshly obtained Fe(OH)_(3) precipitated is dispersed, by a little FeCl_(3) , into colloidal solution owing to the adsorption of Fe^(3+) ions in preference. Thus sol particles will be positively charged. In some cases the colloidal particles are aggregates of cations or anions having ampiphilic character. When the ions posses hydrophobic part (hydrocarbon end) as well as hydrophilic part (polar end group), they undergo association in aqueous solution to form particles having colloidal size. The formation of such particles, called micelles plays a very important role in the solubilization of water insoluble substances, (hydrocarbon, oils, fats, grease etc.). In micelles, the polar end groups are directed towards water and the hydrocarbon ends into the centre. The charge on sol particles of proteins depends on the pH. At low pH, the basic group of protein molecule is ionized (protonated) and at higher pH (alkaline medium), the acidic group is ionized. At isoelectric pH, characteristic to the protein, both basix and acidic groups are equally ionized. The stability of colloidal solution is attributed largely to the electric charge of the dispersed particles. This charge causes them to be coagulated or precipitated. On addition of small amount of electrolytes, the ions carrying oppiste charge are adsorbed by sol particles resulting in the neutralization of their charge. When the sol particles either with no charge or reduced charge, come closer due to Brownian movement, they coalesce to form bigger particles resulting in their separation from the dispersion medium. This is what is called coagulating or precipitation of the colloidal solution. The coagulating power of the effective ion, which depend on its charge, is expressed in terms of its coagulating value, defined as its minimum concentration (m mol/L) needed to precipitate a given sol. Which of the following ions would have the minimum coagulating value for sol obtained on peptizing Sn(OH)_(4) by little NaOH solution?

Peptization of SnO_2 by NaOH gives :

Statements : A yeellow colured As_2S_3 sol on mixing with red colured Fe(OH)_3 sol gives colsurless soltion . Expabnations : The -ve charge os As_2S_3 sol particles is neutralised by + ve charge of Fe(OH)_3 sol particles and thus sols are destabilized and show mutual coagulation .

DISHA PUBLICATION-SURFACE CHEMISTRY-Exercise-1 : Concept Builder (TOPICEWISE)
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