Which of the following methods is used to separate a mixture of salt and camphor?

Sublimation

The correct answer is option 3. Sublimation.

The correct method used to separate a mixture of salt and camphor is sublimation. Sublimation is a process where a substance transitions from a solid directly to a vapor without passing through the liquid state. In this case, camphor undergoes sublimation, leaving behind the salt as a residue. The vaporized camphor can then be condensed back into a solid form.

Centrifugation is a technique used to separate particles from a solution based on their density using centrifugal force. Filtration involves separating solid particles from a liquid using a filter. These methods are not suitable for separating a mixture of salt and camphor.