Here it is
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Fusion test, or Lassaigne's test, is used in elemental analysis for the qualitative analysis using Copper metal
Liebig's method is used for the estimation of Carbon and hydrogen by combustion of organic compound.
Beilstein test is like flame test in which a copper wire is cleaned and heated in a Bunsen burner flame to form a coating of copper(II) oxide. It is then dipped in the sample to be tested and once again heated in a flame.