A lyophobic colloid is :
As2S3
starch
agar - agar
gelatin
A.
As2S3
Lyophobic colloids are those in which the Lyophobic colloids are those in which the dispersed phase has no attraction for the medium or the solvent .These are also known as suspensoids .These are generally Jess stable and regarded as irreversible colloids .
Example : Sulphur sol in water , Fe(OH)3 , AgCl , gold sol etc .
HF is not preserved in glass bottle because :
it reacts with the visible part of the light
it reacts with the sodium oxide of the glass
it reacts with the aluminium oxide of the glass composition
it reacts with SiO2 of the glass
In a lead storage battery , reaction at cathode is :
Pb + SO42- PbSO4 + 2e-
Pb + PbO2 + 2H2SO4 2PbSO4 + 2H2O
PbSO4 + 2e- Pb + SO42-
PbO2 + 4H+ + SO42- + 2e- PbSO4 + 2H2O
In coagulating the colloidal solution of As2S3 .which has the minimum coagulating value ?
NaCl
KCl
BaCl2
AlCl3