Which of the following ionic species canno be present in the sodium fusion extract used in Lassaigne's test?

which of the following is the CORRECT test for detecting nitrogen in the sodium fusion extract of an organic compound containing C, H and N ?

which of the following is the CORRECT test for detecting nitrogen in the sodium fusion extract of an organic compound containing C, H and N ?

How does an aminothioether respond to sodium fusion extract test?

Can we use potassium in place of sodium for preparing Lassaigne's extract ?

Fluorine can not be tested by sodium fusion Lassaigne's test because

Which metal is used to prepare Lassaigne's extract?