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Q. Orthoboric acid when heated to red hot gives:

NTA AbhyasNTA Abhyas 2022

Solution:

$\text{H}_{\text{3}} \text{BO}_{\text{3}} \rightarrow _{\text{-H}_{\text{2}} \text{O}}^{\text{Δ/100}^{\text{o}} \text{C}} \text{HBO}_{\text{2}} \rightarrow _{\text{-160}^{\text{o}} \text{C}}^{\text{Δ}} \text{H}_{\text{4}} \text{B}_{\text{2}} \text{O}_{\text{7}} \rightarrow _{\text{Red} \, \text{Hot } \, \text{>} \, \text{250}^{\text{o}} \, \text{C}}^{\text{Δ}} \text{B}_{\text{2}} \text{O}_{\text{3}} \, \text{+2H}_{\text{2}} \text{O}$