When borax is heated strongly it gives:

B_{2} O_{3}

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

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

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None of the above

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Solution

The correct option is C $N a B O_{2} + B_{2} O_{3}$
It first swells due to loss of water in the form of steam.
$N a_{2} B_{4} O_{7} \cdot 10 H_{2} O Δ ⟶ N a_{2} B_{4} O_{7} Δ ⟶ 2 N a B O_{2} + B_{2} O_{3}$

$N a B O_{2} + B_{2} O_{3}$ is the glassy bead that is formed on heating borax. Hence correct option is c.

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