The solute and solvent in the solution of hydrogen in palladium are
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Solute: Gas; Solvent: Solid
In a solution the solvent is the component present in the larger amount, and it decides the physical state of the solution; the solute is the component present in the smaller amount. Solutions are grouped by the states of the solute and the solvent, which gives nine types.
Palladium is a metal that absorbs hydrogen gas into its crystal lattice. The hydrogen (solute) is a gas and the palladium (solvent) is a solid, so the solution of hydrogen in palladium is a gas-in-solid solution, a solid solution.
Why the other options are incorrect
Option (2) Solute: Gas; Solvent: Liquid — Incorrect. This is a liquid solution such as oxygen dissolved in water; palladium is a solid.
Option (3) Solute: Liquid; Solvent: Gas — Incorrect. This is a gaseous solution such as chloroform mixed with nitrogen gas.
Option (4) Solute: Liquid; Solvent: Solid — Incorrect. This is a solid solution such as the amalgam of mercury with sodium; hydrogen is a gas, not a liquid.
NCERT (2026-27 edition):
Types of Solutions – …
