The borax bead 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 D $B_{2} O_{3} + N a B O_{2}$
Glass like bead is a mixture of sodium metaborate and boric anhydride. In the flame it swells up as it loses its water of crystallization.

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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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