The final product obtained when boric acid is heated to red heat is :

metaboric acid

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tetraboric acid

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boron oxide

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pyroboric acid

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Solution

The correct option is D boron oxide
$H_{3} B O_{3} \to B_{2} O_{3}$
$H_{3} B O_{3} 100^{\circ} C - -- \to B O_{2} 160^{\circ} C - -- \to H_{2} B_{4} O_{7}$
Hence, option C is correct.

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