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Question
Orthoboric acid when heated to red hot gives
Options:
A .  Metaboric acid
B .  Metaboric acid
C .  Boron and water
D .  Boric anhydride
Answer: Option D
:
D
H3BO3100C−−HBO2160C−−H2B4O7+H2O2B2O3+H2O

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