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11.31     Write balanced equations for:

         (iv)\; H_{3}BO_{3}\overset{\Delta }{\rightarrow}

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Orthoboric acid on heating gives metaboric acid with the removal of 4 molecules of water and on further heating, metaboric acid converts to tetraboric acid and later on Boron trioxide (boric anhydride)

4H_{3}BO_{3}\overset{\Delta }{\rightarrow}4HBO_{2}\overset{410K}{\rightarrow}H_{2}B_{4}O_{7}\overset{red\ hot}{\rightarrow}2B_{2}O_{3}

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seema garhwal

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