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# Which of the following is an example of gaseous solution?

$\begin{array}{1 1}(a)\;\text{Oxygen dissolved in water}\\(b)\;\text{Ethanol dissolved in water}\\(c)\;\text{Copper dissolved in gold}\\(d)\;\text{Chloroform mixed with nitrogen gas}\end{array}$

Gaseous solution means solute as well as solvent are in gas phase.
In the given options both $CHCl_3$ and $N_2$ are in gaseous state.
Hence (d) is the correct answer.