In borax bead test, which compound is formed ?

Orthoborate

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Metaborate

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Double oxide

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Tetraborate

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Solution

The correct option is B Metaborate
In borax bead test, the coloured metaborates are formed by transition metal slats.
$N a_{2} B_{4} O_{7} \cdot 10 H_{2} O Δ - ---- \to - 10 H_{2} O N a_{2} B_{4} O_{7} Δ \to 2 N a B O_{2} + B_{2} O_{3} B_{2} O_{3} + C u O \to C u (B O_{2})_{2} C u p r i c m e t a b o r a t e (B l u e b e a d)$

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