Which one of the following set phenomena would increase on raising the temperature ?

Question

Accepted Answer

Option 2 is the correct answer because it includes phenomena that are directly influenced by an increase in temperature, leading to their enhancement:

1. **Evaporation**: This is the process where liquid molecules gain enough energy to transition into the gaseous state. As temperature increases, the kinetic energy of the molecules also increases, making it easier for them to overcome intermolecular forces and evaporate. Therefore, evaporation increases with temperature.

2. **Diffusion**: This is the movement of particles from an area of higher concentration to an area of lower concentration. Higher temperatures provide more kinetic energy to the particles, causing them to move faster and thus increasing the rate of diffusion.

3. **Expansion of gases**: According to Charles's Law, the volume of a gas is directly proportional to its temperature when pressure is held constant. As temperature increases, gas molecules move more vigorously, causing the gas to expand.

Now, let's explain why the other options are incorrect:

1. **Option 1 (Evaporation, solubility, compression of gases)**: While evaporation and solubility generally increase with temperature, compression of gases does not. Compression refers to reducing the volume of a gas, which typically requires a decrease in temperature or an increase in pressure, not an increase in temperature.

3. **Option 3 (Diffusion, solubility, compression of gases)**: Similar to Option 1, diffusion and solubility increase with temperature, but compression of gases does not. Therefore, this option is incorrect.

4. **Option 4 (Condensation, diffusion, compression of gases)**: Condensation is the process where gas turns into a liquid, which typically occurs when the temperature decreases, not increases. While diffusion increases with temperature, compression of gases does not. Thus, this option is incorrect.

In summary, Option 2 correctly identifies the phenomena that increase with temperature: evaporation, diffusion, and expansion of gases.