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Question

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

A
Sodium tetraborate
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B
Sodium metaborate
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C
Sodium metaborate and boric anhydride
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D
Boric anhydride and sodium tetraborate
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Solution

The correct option is C Sodium metaborate and boric anhydride
Na2B4O7.10H2OHeatNa2B4O7+10H2O
Na2B4O72NaBO2+B2O3 Glassy bead

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