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# Which of the following is boric acid ?

$\begin {array} {1 1} (A)\;HBO_2 & \quad (B)\;H_3BO_3 \\ (C)\;H_2B_4O_7 & \quad (D)\;B_2O_3 \end {array}$

Boric acid is $H_3BO_3$. It is a monobasic acid. It does not liberate hydrogen ion but accepts a hydroxyl ion, i.e, it behaves as a Lewis acid.
Hence option (B) is the correct answer.
edited Jul 28, 2014