Question
Give three examples each:
$i.$ Positively charged sols $ii.$ Negatively charged sols
$i.$ Positively charged sols $ii.$ Negatively charged sols
✓
Answer
$i.$ Positively charged sols $: Al_2O_3. xH_2O,$ haemoglobin, $TiO_2$ sol
$ii.$ Negatively charged sols: $Au$ sols, Congo red sol, clay
$ii.$ Negatively charged sols: $Au$ sols, Congo red sol, clay
| Positively charged sols | Negatively charged sols |
| Hydrated metallic oxides $: Al_2O_3.xH_2O, CrO_3.xH_2O, Fe_2O_3.xH_2O.$ | Metals $: Cu, Ag. Au$ sols Metallic sulphides $: As_2S_3, Sb_2S_3, CdS$ |
| Basic dye stuff, methylene blue sols | Acid dye stuff, eosin, Congo red sol |
| Haemoglobin $($blood$)$ | Sols of starch, gum |
| Oxides$: TiO_2$ sol | Gelatin, clay, gum sols |
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