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  • When orthoboric acid is heated to red heat the residue is - Option: 1 Boron Option: 2</strong

When orthoboric acid is heated to red heat the residue is - 

Option: 1

Boron 


Option: 2

Boric Oxide


Option: 3

Metaboric acid 


Option: 4

Polyboric acid 


Answers (1)

best_answer

As we have learned

Effect of heat on boric acid -

Orthoboric acid forms metaboric acid, HBO2; on further heating yields boric oxide, B2O3

\mathrm{4H_{3}BO_{3}\xrightarrow[-H_{2}O]{\Delta }4HBO_{2}\xrightarrow[-H_{2}O]{410K}H_{2}B_{4}O_{7}\xrightarrow[-H_{2}O]{Red hot}2B_{2}O_{3}}

Therefore, option (2) is correct.

Posted by

Pankaj

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