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Question

Which of the following compounds is formed in borax bead test?

A
Metaborate
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B
Tetraborate
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C
Triborate
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D
Orthoborate
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Solution

The correct option is A Metaborate
Metaborate is formed in borax bead test.
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 glassy bead consisting of sodium metaborate and boric anhydride.
Na2B4O710H2ONa2B4O7+10H2O740oC2NaBO2Sodium Metaborate+B2O3
CuO+B2O3Cu(BO2)2 blue bead

Thus, Metaborate is formed.

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