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Q.

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

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a

Sodium metaborate

b

Sodium metaborate and boric anhydride

c

Sodium pyroborate

d

Boric anhydride

answer is A.

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Detailed Solution

detailed_solution_thumbnail
  • On heating, borax first loses water molecules and swells up. 
  • On further heating it turns into a transparent liquid, which solidifies into glass like material known as borax bead.
  • Na2B4O7.10H2O→∆Na2B4O7→∆2NaBO2sodium metaborate+B2O3boric anhydride
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