1. Briefly explain what is meant by the term "eutectic composition". 2. A student was given three unknown compounds labelled sample 1, 2 and 3 . She carefully determined the melting ranges for the three samples. Her results are shown below: She was also given the melting ranges for five pure compounds labelled A,B,C,D and E (results below). She then performed a series of mixed melting point determinations in order to determine the identit and purity of the three samples. The results of this determination are shown below. a) Which of the three samples are relatively pure? b) Identify the three samples (as A, B, C, D, E or none of these)