What are three separation techniques to separate iron filings, salt and sand?

First Magnetic Separation to remove the iron fillings.

Next Dissolution of the sand and salt in water, and Filtration to separate the salt solution from the sand.

Evaporation of the salt solution to get back the salt.

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2