Borax glass is a mixture of :

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

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N a_{2} B_{4} O_{7} + B_{2} O_{3}

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H_{2} B_{4} O_{7} + B_{2} O_{3}

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N a_{2} B_{4} O_{7.} 10 H_{2} O + B_{2} O_{3}

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Solution

The correct option is A $N a B O_{2} + B_{2} O_{3}$
It is the glassy bead that is formed on heating borax. On heating borax first gives sodium tetra borate and finally gives a mixture of sodium metaborate and $B_{2} O_{3}$ called borax glass.

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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

H_{3} B O_{3}

△ - \to

A + B . A & B

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

B + H_{2} O \to A + B . A & B

B N + H_{2} O \to A + B . A & B

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