(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 in a compound by Lassaigne's test?

(a) What is Lassaigne's extract? Will NaCN give a positive Lassaigne's

1.	(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 in a compound by Lassaigne's test?
Answer» <html><body><p></p>Solution :(a) When organic compounds is fused with sodium metal and then extracted by water it is called Lassaigne.s <a href="https://interviewquestions.tuteehub.com/tag/extract-981847" style="font-weight:bold;" target="_blank" title="Click to know more about EXTRACT">EXTRACT</a>. Yes. <br/> (b) Blood red <a href="https://interviewquestions.tuteehub.com/tag/colour-422259" style="font-weight:bold;" target="_blank" title="Click to know more about COLOUR">COLOUR</a> <br/> (c) Lassaigne.s extract is prepared in distilled water <a href="https://interviewquestions.tuteehub.com/tag/since-644476" style="font-weight:bold;" target="_blank" title="Click to know more about SINCE">SINCE</a> tap water contains `CT^(-)` ions. No, <a href="https://interviewquestions.tuteehub.com/tag/oxygen-1144542" style="font-weight:bold;" target="_blank" title="Click to know more about OXYGEN">OXYGEN</a> cannot be detected by Lassaigne.s test.</body></html>