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Question

Orthoboric acid behaves as weak monobasic acid in water giving H3O+ and

A
H2BO2
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B
H2BO3
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C
[B(OH)4]
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D
[B(OH)4]+
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Solution

The correct option is C [B(OH)4]
In aqueous solutions, the B atom​ completes its octet by accepting​ OH from H2O molecules​.
B(OH)3+2H2O[B(OH)4]+H3O+
Therefore, it functions as a​ lewis acid and not as a​ proton donor like most acids​. Since it behaves as a weak acid​. Hence, the correct answer is option (c).

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