Which pair of compounds will form a solution?

Lets a typical solution of salt in water.

Typical common salt for cooking is NaCl, and water is H₂O.

So NaCl and H₂O will form a solution.   

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.