When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to :

Question

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to : (A) B 2 O 3 (B) Co ( BO 2)2 (C) CoB 4 O 7 (D) Co [ B 4 O 5( OH )4]

Tardigrade Admin · Accepted Answer

Na 2 B 4 O 7 ⋅ 10 H 2 O stackrelΔ longrightarrow Na 2 B 4 O 7+10 H 2 O Na 2 B 4 O 7 stackrelΔ longrightarrow 2 NaBO 2 text (sodium meta borate) + B 2 O 3 B 2 O 3+ CoO arrow Co ( BO 2)2 text (cobalt(II)meta borate) Blue Bead

Q. When borax is heated with $C o O$ on a platinum loop, blue coloured bead formed is largely due to :

$B_{2} O_{3}$

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

$C o B_{4} O_{7}$

$C o [B_{4} O_{5} (O H)_{4}]$

$N a_{2} B_{4} O_{7} \cdot 10 H_{2} O ⟶ Δ N a_{2} B_{4} O_{7} + 10 H_{2} O$
$N a_{2} B_{4} O_{7} ⟶ Δ 2 N a B O_{2} (sodium meta borate) + B_{2} O_{3}$
$B_{2} O_{3} + C o O \to C o (B O_{2})_{2} (cobalt(II)meta borate)$ Blue Bead

Q. When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to :

B2​O3​

Co(BO2​)2​

CoB4​O7​

Co[B4​O5​(OH)4​]