9 Which of the following is a heterogeneous mixture? A. Air B. Oil in water C. Stainless steel D. Soft drink 10. What is/are true for substance and mixture? I. Pure substance melts completely. II. Pure substance has a varying boiling point. III. Mixture does not melt completely. IV. Mixture has a fixed boiling point. A. I and II only B. I and III only C. II and IV only D. I and IV only
