Answers

Matter In Our Surroundings

Which one of the following sets of phenomena would increase on raising
the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

05/11/2024

Science

9th

Answers

The correct answer is (c) Evaporation, diffusion, expansion of gases.
Explanation:
Evaporation:
As temperature increases, the kinetic energy of liquid molecules increases, allowing more of them to overcome the surface tension and escape into the gas phase, leading to faster evaporation.
Diffusion:
Higher temperature means molecules have more kinetic energy, causing them to move faster and spread out more readily, increasing the rate of diffusion.
Expansion of gases:
With higher temperature, gas molecules move faster and exert more pressure on their container, causing the gas to expand.
Why other options are incorrect:
(a) Diffusion, evaporation, compression of gases:
While diffusion and evaporation increase with temperature, compression of gases generally decreases as temperature increases. Higher temperature leads to increased gas volume and pressure if the container is closed, not compression.
(b) Evaporation, compression of gases, solubility:
Evaporation increases with temperature, but compression of gases decreases. Solubility can also be affected by temperature, but the relationship is complex and depends on the specific solute and solvent. Not all solubilities decrease with temperature.
(d) Evaporation, solubility, diffusion, compression of gases:
Similar to option (b), evaporation and diffusion increase with temperature, while compression of gases and solubility generally decrease or have complex temperature dependencies.

09/05/2025