First slide
Orthoboric acid
Question

Statement 1 : H3BO3 is monobasic Lewis acid but salt Na3BO3   exists.

Statement 2 : H3BO3 reacts with NaOH to give Na3BO3.

Moderate
Solution

(1) H3BO3 in it self does not  contain any replaceable hydrogen atom  But on interaction with water a hydrogen ion is liberated by accepting OH- ion

Hence it is a monobasic acid 

Due to the presence of empty orbital on Boron atom , It  readily accepts the electron pair and acts as a Lewis acid

(II) BOH3+  NaOH    NaBOH4-

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