Which sequence correctly represents the products obtained upon progressive heating of orthoboric aci — p Block Elements Chemistry Question

💡 Solution & Explanation

Orthoboric acid loses water sequentially on heating. At $100^\circ C$, it loses water to form metaboric acid ($HBO_2$). At $160^\circ C$, it forms tetraboric acid ($H_2B_4O_7$), and at red heat, it entirely dehydrates to boron sesquioxide ($B_2O_3$).