Question 19: Which of the following cases (A; B; C; D) is a pure substance?

Question 19: Which of the following cases (A; B; C; D) is a pure substance? A. Wood. B. Mineral water C. Sodium chloride. D. Sea water. Sodium chloride is pure because it contains only one substance, sodium chloride (NaCl). The answer to choose is: ===============

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