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Why is lassaigne's test in used sodium metal?

Why is lassaigne's test in used sodium metal? Why is there no other metal?


sodium used in lassaigne's test- because of electropostive nature and in order to convert covalent form to ionic form it is quite reactive . 
Lassaigne's test is a test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. In order to detect them, these have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be detected by simple chemical tests. The extract is called sodium fusion extract or Lassaigne's extract.

Other metal was no electropositive nature and in order to no convert covalent form to ionic form, so no used other metal in lassaigne's test.

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