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MCQEasyJEE 2023Trends in Atomic Radius & Ionisation Energy

JEE Chemistry 2023 Question with Solution

Given below are two statements:

Statement I: Lithium and Magnesium do not form superoxide.

Statement II: The ionic radius of Li+Li^+ is larger than the ionic radius of Mg2+Mg^{2+}.

  • A

    Statement I is correct, but Statement II is incorrect.

  • B

    Statement I is incorrect, but Statement II is correct.

  • C

    Both Statement I and Statement II are correct.

  • D

    Both Statement I and Statement II are incorrect.

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given:

  • Statement I: Lithium and Magnesium do not form superoxide.
  • Statement II: The ionic radius of Li+Li^+ is larger than the ionic radius of Mg2+Mg^{2+}.

Find: Which option correctly evaluates the two statements.

From the solution:

Li+=76 pm,Mg2+=72 pmLi^+ = 76 \, \text{pm}, \quad Mg^{2+} = 72 \, \text{pm}

So, the ionic radius of Li+Li^+ is larger than that of Mg2+Mg^{2+}. Therefore, Statement II is correct.

The solution also states that both Lithium and Magnesium are unable to form superoxide because of their small size. Therefore, Statement I is correct.

Hence, both Statement I and Statement II are correct. Therefore, the correct option is C.

Common mistakes

  • Confusing superoxide with peroxide. The statement asks about superoxide formation, so the conclusion must be matched to that exact species, not a different oxide type.

  • Comparing ionic sizes incorrectly by assuming the element with higher atomic number must always have the larger ion. Here, the relevant comparison is between Li+Li^+ and Mg2+Mg^{2+}, and the provided values show Li+Li^+ is larger.

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