Which of following are solid solutions?
(A) Solution of hydrogen in palladium
(B) Camphor in nitrogen gas
(C) Copper dissolved in gold
(D) Amalgam of mercury with sodium
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A), (C) and (D) only
A solution is named after the physical state of its solvent, the component present in the larger amount.
(A) Solution of hydrogen in palladium — Correct. The solvent, palladium, is a solid; the gas \( \ce{H2} \) is held inside the metal (gas in solid).
(B) Camphor in nitrogen gas — Incorrect. The solvent is nitrogen, a gas, so this is a gaseous solution (solid in gas).
(C) Copper dissolved in gold — Correct. Both components are solids; this is a solid in solid solution (an alloy).
(D) Amalgam of mercury with sodium — Correct. Liquid mercury is dissolved in solid sodium, a liquid in solid solution.
NCERT (2026-27 edition):
Types of Solutions – …
