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Question

When orthoboric acid (H3BO3) is heated, the residue is:


Your Answer
A
Boron
Your Answer
B
Diborane
Correct Answer
C
Boric anhydride
Your Answer
D
Borax

Solution

The correct option is A Boric anhydride
When heated (above 370 K), H3BO3 ​first forms metaboric acid HBO2 and ​then boric anhydride.
H3BO3100CHBO2ΔB2O3
Hence correct option is c.

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