Pure substances can be distinguished from one another by their texture, solubility, magnetic properties, and electrical conduction. However, among the options provided, the one that would typically be least useful for distinguishing pure substances is A. texture.
Texture can be subjective and may vary widely even within a single pure substance depending on the form in which it occurs (e.g., crystalline vs. powder). The other properties listed (solubility, magnetic properties, electrical conduction) are more definitive and measurable, making them more reliable for distinguishing between pure substances. Thus, the correct answer is A. texture.
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