Question

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

$B_2{O}_3+CuO\to Cu(B{O}_2{)}_2$.

In the case of the borax-bead test, we take borax when coloured bead of the type $Cu(B{O}_2{)}_2$ is formed. In the case of microcosmic bead test, we take microcosmic salt.

• A. True
• B. False

Answer 1

The correct option is A True

The statement is true.

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

$B_2{O}_3+CuO\to Cu(B{O}_2{)}_2$

In the case of borax-bead test we take borax when coloured bead of the type $Cu(B{O}_2{)}_2$ is formed. In case of microcosmic bead test, we take microcosmic salt.

In microcosmic bead test; bead is produced except that microcosmic salt, sodium ammonium hydrogen tetrahydrate is used.The colourless, transparent bead contains sodium metaphosphate.