Question

John wants to understand the rate of diffusion of ink into water. So, he took four glasses A, B, C and D filled with water and each kept at a temperature of ${10}^{0}C$, ${20}^{0}C$, ${30}^{0}C$ and ${40}^{0}C$ respectively. Now John put 3 drop of blue ink slowly and carefully along the sides of all the glasses and left them undisturbed.
In which of the following glass, the number of days taken for the colour of the ink to spread evenly throughout the water will be minimum ?

• A. Glass A
• B. Glass B
• C. Glass C
• D. Glass D

Answer 1

The correct option is D Glass D

$\bullet$ As the temperature rises, particles move faster,means with an increase in temperature the kinetic energy of the particles also increases.Thereore rate of diffusion will increases with increase in temperature.
$\bullet$ Order of temperature of glasses:
Glass A< Glass B<Glass C< Glass D.
$\therefore$ Order of rate of diffusion:
Glass A< Glass B<Glass C< Glass D.
$\therefore$ Glass D would take minimum number of days for the colour to spread evenly throughout the water as it has maximum rate of diffusion.