Answer:

1. Liquid A is Pure Substance

Liquid B is Mixture

2. The sample is a Pure Substance

3.Solid A or pure Substance has a sharp melting point and sharp boiling points. While Solid B or mixture melts over a range of temperatures and boiled over a range of temperatures.

Explanation:

Pure substance consists only one elements or one compound.

Mixture consists of two or more different substances, not chemically joined together.