Which method can be used to separate a mixture of naphthalene and common salt ?

Q. A mixture contains sand, salt, pebbles and water. Which methods of separation can be used to obtain all of these components separately?

Q. Compound "X" on slight heating over room temperature, goes directly from solid state to gaseous state. Which amongst the following method can be used to separate a mixture of X and common salt?

Q. A mixture contains camphor and common salt. Camphor is known to go to the gas phase upon slight heating. So which process can be used to separate common salt from camphor?

Q. Write a method that can be used for separating a mixture of sand and salt.

Q.

How is a mixture of common salt, oil and water separated? You can use a combination of different methods.