Question
Explain Bredig’s arc method.
✓
Answer
- Colloidal sols can be prepared by electrical disintegration using Bredig’s arc method.
- This process involves vaporization as well as condensation.
- Colloidal sols of metals such as gold, silver, platinum can be prepared by this method.
- In this method, electric arc is struck between electrodes of metal immersed in the dispersion medium.
- The intense heat produced vapourizes the metal which then condenses to form particles of colloidal sol.
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
Explain irreversible reaction.
The volume of a given mass of a gas at 0 °C is 0.2 dm3. Calculate its volume at 100 °C, if the pressure remains the same.
i. Dissolve a given amount of sugar in minimum amount of water at room temperature.
ii. Increase the temperature and dissolve more amount of sugar in the same amount of water to make a thick sugar syrup solution.
iii. Cool the syrup to the room temperature.
ii. Increase the temperature and dissolve more amount of sugar in the same amount of water to make a thick sugar syrup solution.
iii. Cool the syrup to the room temperature.
What is the action of heat on crystalline sodium carbonate (washing soda)?
State the rules to be followed for writing resonating structures.
Browning of cut apple can be prolonged by applying lemon juice.
Complete the following table of displacement reactions. Identify oxidising and reducing agents involved.
→| Reactants | Products |
| $Zn_{(s)} +$ ————$_{(aq)}$ | ————$-_{(aq)} + Cu_{(s)}$ |
| $Cu_{(s)} + 2Ag^+_{(aq)}$ | —————–$ +$————– |
| ———– $+$ ————- | $Co _{( aq )}^{2+}+ Ni _{( s )}$ |
What is lanthanide and actinide series?
Half life ${ }^{67} Ga$ is 78 h. How long will it take to decay $12 \%$ of sample of $Ga$ ?
Answer:
Given: $t_{1 / 2}=78 h$,
$N _0=100$,
$N =100-12=88$
→Answer:
Given: $t_{1 / 2}=78 h$,
$N _0=100$,
$N =100-12=88$
On ozonolysis, an alkene forms the following carbonyl compounds. Draw the structure of unknown alkene from which these compounds are formed: $HCHO$ and $CH_3COCH_2CH_3$
→