On heating, orthoboric acid gives metaboric acid along with .

oxygen

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hydrogen

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water

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Solution

The correct option is C water
Orthoboric acid gives metaboric acid along with water on heating.
Metaboric acid on further heating gives tetraboric acid which on further heating gives boron trioxide.
$H_{3} B O_{3} Δ \to H B O_{2} + H_{2} O$
$4 H B O_{2} Δ \to H_{2} B_{4} O_{7} + H_{2} O$
$H_{2} B_{4} O_{7} Δ \to 2 B_{2} O_{3} + H_{2} O$

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