What is the observation on adding a solute crystal to a supersaturated solution?

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AIt become a colloidal solution

BThe solute dissolves in the solution

CThe solution desaturates

DThe solute precipitates out of the solution

Answer:

A supersaturated solution contains more dissolved solute than it can theoretically hold at that specific temperature, making it thermodynamically unstable.
When a seed crystal of the solute is added, it provides a nucleation site, causing the excess dissolved solute to rapidly precipitate (crystallize) out of the solution until equilibrium is restored.

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Statement-1: On heating, the surface of copper powder becomes coated with black copper (II) oxide.
Statement-II: If hydrogen gas is passed over this heated material (CuO), the black coating on the surface tums brown.