During the borax bead test with CuSO4, a blue green colour of the bead was observed in oxidising flame due to the formation of
Select the correct option:
A
$\mathrm{Cu}_3 \mathrm{~B}_2$
B
Cu
C
$\mathrm{Cu}\left(\mathrm{BO}_2\right)_2$
D
CuO
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Sol. Blue green colour is due to formation of $\mathrm{Cu}\left(\mathrm{BO}_2\right)_2$
$$
\begin{aligned}
& \mathrm{CuSO}_4 \xrightarrow{\Delta} \mathrm{CuO}+\mathrm{SO}_3 \\
& \mathrm{CuO}+\mathrm{B}_2 \mathrm{O}_3 \longrightarrow \mathrm{Cu}\left(\mathrm{BO}_2\right)_2
\end{aligned}
$$
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