Answer: D. Match each mixture to the appropriate technique:
W = \(\text{PbCl}_2\) and \(\text{Pb(NO}_3)_2\): \(\text{Pb(NO}_3)_2\) is soluble in water; \(\text{PbCl}_2\) is insoluble. Adding water and filtering separates them → method 3.
X = lubricating oil and water (immiscible liquids): a separating funnel works directly → method 2.
Y = ethanol and water (miscible, close boiling points): fractional distillation is needed because simple distillation can't resolve a mixture this close → method 4.
Z = iodine and sand: iodine sublimes on gentle heating, leaving sand behind → method 1.
Method order 1=Z, 2=X, 3=W, 4=Y matches row D.
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