The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is
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Sublimation
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Chromatography
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Crystallisation
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Steam distillation
D.
Steam distillation
Steam distillation is the most suitable method of separation of 1: 1 mixture of ortho and para nitrophenols as there are intramolecular H-bonds in ortho nitrophenol.