A glassy bead formed by heating borax on a platinum wire loop is

Sodium tetraborate

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Sodium metaborate

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Sodium metaborate and boric anhydride

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Boric anhydride and sodium tetraborate

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Solution

The correct option is C Sodium metaborate and boric anhydride
$N a_{2} B_{4} O_{7} .10 H_{2} O H e a t ⟶ N a_{2} B_{4} O_{7} + 10 H_{2} O$
$N a_{2} B_{4} O_{7} \to 2 N a B O_{2} + B_{2} O_{3} G l a s s y b e a d$

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