In borax bed test the unique colour of the fused beads is due to formation of what
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It’s due to formation of METABORATES of respective elements.
For eg; Mn (manganese) forms Mn(BO2)2 which is Pink-Violet in Color.
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On heating ,borax loses water of crystallisation and swells up to form fluffy mass. On further heating, it melts to give a clear liquid which solidifies to a transparent glossy bead consisting of sodium metaborate and boric unhydride. Thus, Metaborate is formed.
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