Question

In borax bead test, coloured salts are decomposed to give coloured metal metaborates.

• A. True
• B. False

Answer 1

The correct option is A True

Borax Bead Test :

If borax, $N{a}_2{B}_4,O_7,.10H_{2}O$ is heated on the platinum loop, a transparent colourless glass like bead of sodium metaborate $\left(NaB{o}_2\right)$ and boric anhydride $\left(B_2{O}_3\right)$ is formed.

$N{a}_2{B}_4{O}_7\stackrel{\Delta }{\to }2NaB{o}_2+B_2{O}_3$

characteristics coloured beads are produced with salts of copper, iron, chromium, manganese, cobalt and nickel. $Cuo+B_2{O}_3\to Cu(B{o}_2{)}_2$

Copper (II)metaborate