In borax bead test, which compound(s) is/are not 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 options are
A Orthoborate
C Double oxide
D Tetraborate
On heating borax, the colorless glassy bead formed consists of and boric oxide and sodium metaborate.

$N a_{2} B_{4} O_{7} .10 H_{2} O \to N a_{2} B_{4} O_{7} \to 2 N a B O_{2} + B_{2} O_{3}$ .

Hence, options $A, C, a n d D$ are correct.

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