The borax bead is is chemically:

B_{2} O_{3}

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N a_{2} B_{4} O_{7}

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N a_{3} B O_{3}

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B_{2} O_{3} + N a B O_{2}

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Solution

The correct option is C $B_{2} O_{3} + N a B O_{2}$
$N a_{2} B_{4} O_{7} .10 H_{2} O B o r a x \to N a_{2} B_{4} O_{7} + 10 H_{2} O \to B_{2} O_{3} b o r i c o x i d e + 2 N a B O_{2} s o d i u m m e t a b o r a t e$
Borax Bead is a mixture of Sodium Meta Borate ( $N a B O_{2}$ ) and Boric Oxide ( $B_{2} O_{3}$ ).

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Similar questions

N a_{2} B_{4} O_{7} .10 H_{2} O H e a t - -- \to X + N a B O_{2} + H_{2} O

X + C r_{2} O_{3} H e a t - -- \to Y G r e e n c o l o u r

X

Y

$N a B O_{2} + C O_{2} \to A + B$ . A & B are as follows

N a_{2} B_{4} O_{7} Δ \to 2 N a B O_{2} + B_{2} O_{3}

B_{2} O_{3} + C u O \to C u (B O_{2})_{2}

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

(N a {B O}_{2} + B_{2} O_{3})

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