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When orthoboric acid `(H_(3)BO_(3))` is heated, the reidue is

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When orthoboric acid `(H_(3)BO_(3))` is heated, the reidue is
A. boron
B. metaboric acid
C. boric anhydride
D. borax
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(c )`underset("Orthoboric acid")(H_(3)BO_(3))underset("above 70 K")overset(Delta)tounderset("Metaboric acid")(HBO_(2))overset(Delta)tounderset("Boric anhydride")(B_(2)O_(3))`
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