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(i) When the technique sublimation is used for purification?

(ii) What is the Prussian blue coloured compound formed in the Lassaigne's test for confirming the presence of nitrogen in the organic compound?

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(i) This method is used to separate the sublimable compounds from non sublimable compounds

(ii) It is Iron (II) hexacyanoferrate Fe4 [Fe(CN)6 ]xH2O.

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