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STD 11 -p-Block elements - I — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 -p-Block elements - I4 Marks
MCQ
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:

  • A
    Statement $I$ is incorrect but Statement $II$ is correct
  • B
    Both Statement $I$ and Statement $II$ are correct
  • C
    Both Statement $I$ and Statement $II$ are incorrect
  • ✓
    Statement $I$ is correct but Statement $II$ is incorrect
✓

Answer

Correct option: D.
Statement $I$ is correct but Statement $II$ is incorrect
d
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.

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