Which among the following is soluble in water?

Salt is soluble in water. It gets dissolved when it is added to the water. Therefore it is called a soluble substance. Oil and petrol do not get dissolved in water. They are called immiscible liquids, liquids that do not dissolve in a liquid. When they are added to water, they float on it. Sand is an insoluble substance. When it is added to water, it does not dissolve. It gets settled down in the water.