Question

orthoboric acid heated to red heat it gives​

Answer 1

Answer:

When boric acid is heated it converts to metabolic acid which on further heating gives boron trioxide

Answer 2

Orthoboric acid?

Boric acid, also called hydrogen borate, boracic acid, and orthoboric acid is a weak, monobasic Lewis acid of boron. However, some of its behaviour towards some chemical reactions suggest it to be tribasic acid in the Brønsted sense as well.

When heated?

Orthoboric acid when heated above 370K forms metaboric acid, HBO2 which on further heating yields boric oxide, B2O3.

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