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What do we get upon heating or orthoboric acid at last?

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in Chemistry – Class 11 by (148k points)
What do we get upon heating or orthoboric acid at last?

(a) Metaboric acid

(b) Tetraboric acid

(c) Borax

(d) Boron trioxide

I have been asked this question at a job interview.

This interesting question is from p-Block Elements in portion p-Block Elements of Chemistry – Class 11

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Correct option is (d) Boron trioxide

The best explanation: When we heat orthoboric acid at 273 K, we get metaboric acid. Again by heating metaboric acid at 473 K, we get tetraboric acid further heating tetraboric acid to Red Hot we finally get boron trioxide as a final product which is boric anhydride.

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