Medium MCQ +4 / -1 PYQ · JEE Mains 2023

Given below are two statements:

Statement I : Lithium and Magnesium do not form superoxide

Statement II : The ionic radius of $\mathrm{Li}^{+}$ is larger than ionic radius of $\mathrm{Mg}^{2+}$

In the light of the above statements, choose the most appropriate answer from the options given below :

  1. A Statement I is incorrect but Statement II is correct
  2. B Both Statement I and Statement II are incorrect
  3. C Both Statement I and Statement II are correct Correct answer
  4. D Statement I is correct but Statement II is incorrect

Solution

<p>Statement I : &quot;Lithium and Magnesium do not form superoxide&quot;</p> <p>This statement is correct. Lithium and magnesium are smaller in size compared to other elements in their respective groups. Although lithium can form superoxide under certain conditions, in general, the smaller size of these two elements makes it harder for them to form stable superoxides.</p> <p>Statement II : &quot;The ionic radius of Li<sup>+</sup> is larger than the ionic radius of Mg<sup>2+</sup>&quot;</p> <p>This statement is still correct. Despite both lithium and magnesium being small in size, when they lose electrons to form ions, the Mg<sup>2+</sup> ion is smaller than the Li<sup>+</sup> ion due to the loss of two electrons (and thus an energy level) in magnesium compared to the loss of one electron in lithium.</p> <p>So, based on the information, the answer is :</p> <p>Option C : Both Statement I and Statement II are correct.</p>

About this question

Subject: Chemistry · Chapter: s-Block Elements · Topic: Alkali Metals

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