Question
How would you prepare colloids of ink and graphite? (OR)
✓
Answer
Explain about mechanical ‘dispersion method.
1. Using a colloid mill, the solid is ground to colloidal dimension. Coarse dispersion The colloid mill consists of two metal plates rotating in opposite directions at very high speed of nearly 7000 revolution per minute.2. The colloidal particles of required colloidal size is obtained by adjusting the distance between the two plates.3. By this method, colloidal solutions of ink and graphite and prepared.
1. Using a colloid mill, the solid is ground to colloidal dimension. Coarse dispersion The colloid mill consists of two metal plates rotating in opposite directions at very high speed of nearly 7000 revolution per minute.2. The colloidal particles of required colloidal size is obtained by adjusting the distance between the two plates.3. By this method, colloidal solutions of ink and graphite and prepared.
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
Give the uses of boron.
How will you prepare nitric acid?
Explain the electrometallurgy of aluminium.
Explain about electrophilic substitution in Benzoic acid with example.
Difference between Globular and fibrous proteins.
What is meant by Brownian movement?
How much time would it take in minutes to deposit $1.18$ g of metallic copper on a metal object when a current of $2.0$ A is passed through the electrolytic cell containing $Cu^{2+}$ ions?
→When the dilution increases by 100 times, the dissociation increases by 10 times. Justify this statement.
Give reasons for the following.
- Carboxylic acids do not give characteristic reactions of carboxyl group
- Treatment of benzaldehyde with HCN gives a mixture of two isomers which cannot be separated even by careful fractional distillation.
- Sodium bisuiphite is used for the purification of aldehydes and ketones.
Define
- Epimers
- Epimerisation.