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 |
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
State and explain the law of definite proportions.
Write three resonance structures for $CH3 – CH = CH – CHO.$ Indicate their relative stabilities and explain.
→Consider a sample of a gas in a cylinder with a movable piston.
Show digramatically the changes in the position of piston, if
a. Pressure is increased from 1.0 bar to 2.0 bar at constant temperature.
b. Temperature is decreased from 300 K to 150 K at constant pressure
c. Temperature is decreased from 400 K to 300 K and pressure is decreased from 4 bar to 3 bar.
Match the pairs :
| Column A | Column B | ||
| i. | Castner-Kellner cell | a. | Na2CO |
| ii. | Slaked lime | b. | CaCO3 |
| iii. | Solvay process | c. | NaOH |
| iv. | Limestone | d. | Ca(OH)2 |
$2 Na _{( s )}+ H _{2( g )} \stackrel{\Delta}{\longrightarrow} 2 NaH _{( s )}$
In the above chemical reaction which element does undergo oxidation and which does undergo reduction?
→In the above chemical reaction which element does undergo oxidation and which does undergo reduction?
Match the following:
| Process | Used in the purification/separation of | ||
| i. | Crystallization | a. | Acetone and benzene |
| ii. | Simple distillation | b. | Benzoic acid and water |
| iii. | Fractional distillation | c. | Impure copper sulphate |
| iv. | Solvent extraction | d. | Acetone and water |
$3.40 \ g$ of ammonia at $STP$ occupies volume of $4.48 \ dm^3.$ Calculate molar mass of ammonia.
→What are the key ideas of MO theory?###What are the salient features of MO theory?
The half-life of $^{32}P$ is $14.26 d.$ What percentage of $^{32}P$ sample will remain after $40 d?$
→