Henry’s law discusses about:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Solubility of gases in liquids.
Henry’s law is the law of gas solubility, that is, of a gas dissolving in a liquid. In its usual form, \( p = K_H\,x \), the higher the KH of a gas, the lower its solubility. Soft drinks sealed under a high pressure of \( \ce{CO2} \), and the bends in scuba divers who come up too fast, are everyday cases of it.
Why the other options are incorrect
Option (1) Solubility of immiscible liquids — Incorrect. Immiscible liquids do not dissolve in each other, and liquid-liquid solutions are described by Raoult’s law, not Henry’s law.
Option (3) Solid solutions — Incorrect. A solid solution has a solid solvent, such as brass, an alloy of copper and zinc; Henry’s law is about a gas dissolved in a liquid.
Option (4) Mixing of gases — Incorrect. The pressure of a mixture of gases is given by Dalton’s law of partial pressures.
NCERT (2026-27 edition):
Solubility of a Gas in a Liquid – …
