During the borax bead test with CuSO 4, a blue green colour of the bead was observed in oxidising flame due to the formation of

Question

During the borax bead test with CuSO 4, a blue green colour of the bead was observed in oxidising flame due to the formation of (A) Cu3B2 (B) Cu ( BO 2)2 (C) Cu (D) CuO

Tardigrade Admin · Accepted Answer

Blue green colour is due to formation of Cu ( BO 2)2 CuSO 4 xrightarrowΔ CuO + SO 3 CuO + B 2 O 3 arrow Cu ( BO 2)2

Q. During the borax bead test with $C u S O_{4}$ , a blue green colour of the bead was observed in oxidising flame due to the formation of

$C u_{3} B_{2}$

$C u (B O_{2})_{2}$

$C u$

$C u O$

Blue green colour is due to formation of $C u (B O_{2})_{2}$
$C u S O_{4} Δ C u O + S O_{3}$
$C u O + B_{2} O_{3} \to C u (B O_{2})_{2}$

Q. During the borax bead test with CuSO4​, a blue green colour of the bead was observed in oxidising flame due to the formation of

Cu3​B2​

Cu(BO2​)2​

Cu

CuO