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Which separation technique is most appropriate for a 1:1 mixture of ortho-nitrophenol and para-nitrophenol?

1. Chromatographic separation
2. Crystallization
3. Steam distillation
4. Sublimation

Correct answer: Chromatographic separation

Solution

Although o-nitrophenol and p-nitrophenol differ in volatility, chromatographic separation is the most suitable method for a 1:1 mixture. It can separate closely related compounds effectively based on their different interactions with the stationary phase.

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