Question

In Borax bead test, which compound of the bead reacts with basic radical to fom metaborate

Answer 1

Boric anhydride is non-volatile. When it is reacted with coloured metallic salt, a characte¬ristic coloured bead of metal metaborate is formed. In the cases where different coloured beads are obtained in the oxidising and reducing flames, metaborates in various oxidation states of metals are formed

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Answer 2

$\huge\mathcal\blue{Answer:}$

$\boxed{\red{\texttt{Borax\:bead\:test}}}$

Sodium tetaraborate decahydrate $\boxed{\green{Na_2B_4O_7.10H_2O}}$is called borax

On heating borax first it swells up due to the elimination of the water molecules. On further heating it melts to a liquid which then solidifies to a transparent glassy mass. It contains sodium meta borate and boric acid

$\red{Na_2B_4O_710H_2O}{\rightarrow}\blue{Na_2B_4O_7}{\rightarrow}\pink{2NaBO_2+B_2O_3}$

${B_2O_3}$ combines with meat oxides to form metal metaborates which form coloured beads. This reaction is called " Borax bead test."

$\blue{B_2O_3+CoO}{\rightarrow}\pink{Co(BO_2)_2}$