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Given below are two statements :
Statement $I$: In group $13$, the stability of $+1$ oxidation state increases down the group.
Statement $II$: The atomic size of gallium is greater than that of aluminium.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement $I$ is incorrect but Statement $II$ is correct
Both Statement $I$ and Statement $II$ are correct
Both Statement $I$ and Statement $II$ are incorrect
Statement $I$ is correct but Statement $II$ is incorrect
Solution
Statement $I$ : Number of $d$ & f electrons, increases down the group and due to poor shielding of $d$ & $f$ $\mathrm{e}^{-}$, stability of lower oxidation states increases down the group
Statement $II$ : The atomic size of aluminum is greater than that of gallium.
