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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

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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.
${Na}_{2} B_{4} O_{7} . 10 H_{2} O \overset{∆}{\to} {Na}_{2} B_{4} O_{7} \overset{∆}{\to} \underset{sodium metaborate}{2 {NaBO}_{2}} + \underset{boric anhydride}{B_{2} O_{3}}$

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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