First slide

Borax

Question

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

Easy

A

Sodium metaborate and boric anhydride
B

Boric anhydride
C

Sodium metaborate
D

Sodium pyroborate

Solution

$\mathop {N{a_2}{B_4}{O_7}.10{H_2}O}\limits_{Borax\,decahydrate} \mathop {\xrightarrow{\Delta }}\limits_{ - 10{H_2}O}$ $\mathop {N{a_2}{B_4}{O_7}}\limits_{Anhydrous\,\,Borax} \xrightarrow{\Delta }$ ${\underline {\mathop {2NaB{O_2}}\limits_{Sodium\,\,metaborate} + \mathop {\mathop {{B_2}{O_3}}\limits_{Boric} }\limits_{anhydride} } }$
Sodium metaborate and boricanhydride mixture is said to be "transparent glassy bead".The formation of "transparent glassy bead" is due to the formation of Sodium metaborate and boricanhydride mixture.

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