Consider the following.Statement-I : The orde | vedclass

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(C) Statement-$I$ is correct. Due to the poor shielding effect of $d$ and $f$ electrons in $Tl$,the effective nuclear charge increases,resulting in a

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Statement-$I$ is correct,but statement-$II$ is not correct

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(C) Statement-$I$ is correct. Due to the poor shielding effect of $d$ and $f$ electrons in $Tl$,the effective nuclear charge increases,resulting in a higher electronegativity for $Tl$ compared to $Al$ and $In$. The order is $B (2.04) > Tl (1.8) > Al (1.61) > In (1.5)$.Statement-$II$ is incorrect. Boric acid ($H_3BO_3$ or $B(OH)_3$) is not a protonic acid (it does not release $H^+$ ions). Instead,it acts as a Lewis acid by accepting an $OH^-$ ion from water to form $[B(OH)_4]^-$,releasing $H^+$ ions from the water molecule.

Consider the following.
Statement-$I$ : The order of electronegativity of $B, Al, In, Tl$ is $B > Tl > Al > In$.
Statement-$II$ : Boric acid is a weak protonic acid.
The correct answer is

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Consider the following.Statement-$I$ : The order of electronegativity of $B, Al, In, Tl$ is $B > Tl > Al > In$.Statement-$II$ : Boric acid is a weak protonic acid.The correct answer is