Medium
Why do painters add oil to paint when painting a wall with oil paint?
- ATo increase the viscosity of the paint.
- BTo decrease the surface tension of the paint.
- CTo increase the surface tension of the paint.
- DTo make the paint dry faster.
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Which instrument is used for the determination of particle size?
Which of the following is lyophobic in nature?
Easy
View SolutionMatch List $I$ with List $II$:
List $I$ List $II$ $(A)$. Brownian Motion $(I)$. Removal of impurities from the colloidal sols using a semipermeable membrane. $(B)$. Tyndall Effect $(II)$. Movement of colloidal particles under the influence of an electric field. $(C)$. Electrophoresis $(III)$. Random movement of colloidal particles due to kinetic energy. $(D)$. Dialysis $(IV)$. Scattering of light by colloidal particles
| List $I$ | List $II$ |
| $(A)$. Brownian Motion | $(I)$. Removal of impurities from the colloidal sols using a semipermeable membrane. |
| $(B)$. Tyndall Effect | $(II)$. Movement of colloidal particles under the influence of an electric field. |
| $(C)$. Electrophoresis | $(III)$. Random movement of colloidal particles due to kinetic energy. |
| $(D)$. Dialysis | $(IV)$. Scattering of light by colloidal particles |
Tyndall effect is observed due to
The surface tension of a soap solution is $30 \times 10^{-3} \, N/m$. The work done to increase the surface area of a soap film from $5 \, cm \times 5 \, cm$ to $10 \, cm \times 10 \, cm$ is:
Medium
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