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

(b) Which colour will appear in the Lassaigne’s test if the compound contains both nitrogen and sulphur.

(c) Why is Lassaigne’s extract prepared in distilled water? Can we detect oxygen iii a compound by Lassaigne’s test?

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(a) When organic compounds is fused with sodium metal and then extracted by water it is called Lassaigne’s extract. Yes.

(b) Blood red colour. 

(c) Lassaigne’s extract is prepared in distilled water since ta water contains Cl’ ions. No, oxygen cannot be detected by Lassaigne’s test.

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