Answer :

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when orthoboric acid is heated above 170⁰C it gives meta boric acidwhich on furthur heating above 300⁰C gives tetra boric acid and on futher heating gives boron trioxide.

EXPLANATION:

  • On heating, the Borax undergoes several transition forms. Initially, it will lose all of the possessed water molecules and then it started to swell. Then it will get turned into a transparent liquid and become solidify to form a glass like material known as ‘borax bead’.  

        [tex]\bold{\mathrm{Na}_{2} \mathrm{B}_{4} \mathrm{O}_{7} \cdot \mathrm{10H}_{2} \mathrm{O} \rightarrow \mathrm{Na}_{2} \mathrm{B}_{4} \mathrm{O}_{7} \rightarrow 2 \mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}}[/tex]

  • Here the first material is Borax, which leads to the formation of sodium metaborate, and then it will leads to the formation of Boric anhydride.

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