Which of the following statements regarding orthoboric acid (H₃BO₃) is false?

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It has a planar structure.

It is soluble in hot water.

It acts as a weak monobasic acid.

It acts as a tribasic acid.

answer is D.

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Detailed Solution

Orthoboric acid is a weak monobasic Lewis acid as it accepts one hydroxide ion (OH^-) from water to complete its octet.

$B {(OH)}_{3} + 2 HOH \to [B {(OH)}_{4}]^{-} + H_{3} O^{+}$

Orthoboric acid is a weak monobasic Lewis acid, thereby does not react with cold water like other acids. But after heating, orthoboric acid becomes soluble in water. This concludes that orthoboric sparingly soluble in water but completely soluble in hot water.

Orthoboric acid forms a planar layer like structure where each unit of boric acid linked with another boric acid through hydrogen bonding.

Therefore, statements present in option (1), (2), and (3) are correct.

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