When orthoboric acid (H3BO3) is heated, the residue is:
A
Boron
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B
Diborane
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C
Boric anhydride
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D
Borax
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Solution
The correct option is C Boric anhydride When heated (above 370 K), H3BO3 first forms metaboric acid HBO2 and then boric anhydride. H3BO3100∘C⟶HBO2Δ⟶B2O3
Hence correct option is c.