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(i) What is Lassaigne's extract? Will NaCN give a positive Lassaigne's test for nitrogen?

(ii) Name three types of chromatography.

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(i) When organic compound is fused with sodium metal and then extracted by water, it is called Lassaigne's extract. Yes NaCN give a positive Lassaigne's test for nitrogen.

(ii) Column chromatography, paper chromatography and thin layer chromatography.

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