Which of the following hydroxides is acidic?

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(D) In group $13$ elements,the acidic character of hydroxides decreases down the group as the metallic character increases.$B(OH)_3$ (also written as

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$B(OH)_3$

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(D) In group $13$ elements,the acidic character of hydroxides decreases down the group as the metallic character increases.$B(OH)_3$ (also written as $H_3BO_3$) is a weak monobasic Lewis acid because it accepts an $OH^-$ ion from water to release $H^+$ ions: $B(OH)_3 + H_2O \rightleftharpoons [B(OH)_4]^- + H^+$.$Al(OH)_3$ and $Ga(OH)_3$ are amphoteric in nature.$Tl(OH)_3$ is basic in nature due to the large size and lower ionization energy of $Tl$.

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