The question asks to identify the type of solution formed when camphor is present in nitrogen gas.
A solution is formed when one substance dissolves into another. In this case, camphor (the solute) dissolves or disperses into nitrogen gas (the solvent).
Since the solute is a solid and the solvent is a gas, the type of solution formed is classified as a Solid - Gas solution.
This type of solution involves the dispersion of solid particles within a gaseous medium.
Therefore, camphor in nitrogen gas represents a Solid - Gas solution.
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