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Question

Borax on heating strongly above its melting point melts to a liquid, then solidifies to a transparent mass commonly known as Borax Bead. The transparent glassy mass consists of :

A
sodium pyroborate
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B
boric anhydride
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C
sodium metaborate
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D
mixture of sodium metaborate and boric anhydride
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Solution

The correct option is D mixture of sodium metaborate and boric anhydride
If borax, Na2B4O7.10H2O is heated on the platinum loop, a transparent colourless glass like bead of sodium metaborate (NaBO2) and boric anhydride (B2O3) is formed.

Na2B4O7Δ2NaBO2+B2O3

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