Evaluate the method of separation to be used.
1. Stones and rice (for cooking)​

hand picking

Explanation:

as stone is bigger in size we can see them with our eyes so we can handpick it

The method of hand picking is used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses. The food grains containing small pieces of stones are taken in a flat container. The pieces of stones are picked up from the grains by hands, one by one, and thrown away.23 Oct 2020

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).