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The best method for the separation of naphthalene and benzoic acid from their mixture is

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The best method for the separation of naphthalene and benzoic acid from their mixture is
A. sublimation
B. Chromatography
C. Crystallisation 
D. distillation
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Correct Answer - C
Out of the given compounds only urea has N =46.67 % .Urea on heating gives a solid residue called which gives violet colour with alkaline `CuSO_(4)`
`H_(2)NCONH+H-NHCONH_(2) overset(Delta)rarr H_(2)NCONH_(2)+NH_(3)`
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