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Assertion: Lithium resembles magnesium d...

Assertion: Lithium resembles magnesium diagonally placed in next group.
Reason: The size of `Li^(+) and Mg^(2+)` are different and their electropositive character is same.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the assertion and reason provided in the question, we will break down the concepts step by step. ### Step 1: Understanding the Assertion **Assertion:** Lithium resembles magnesium diagonally placed in the next group. - Lithium (Li) is an alkali metal in Group 1, while magnesium (Mg) is an alkaline earth metal in Group 2. - The diagonal relationship in the periodic table indicates that elements in different groups but in the same period can exhibit similar properties due to comparable atomic sizes and charge densities. **Conclusion for Step 1:** The assertion is true because lithium and magnesium do exhibit some similar properties, such as forming similar compounds and having comparable reactivity. ### Step 2: Understanding the Reason **Reason:** The size of Li⁺ and Mg²⁺ are different and their electropositive character is the same. - The ionic size of Li⁺ is smaller than that of Mg²⁺. This difference in size affects their properties. - Electropositive character refers to the tendency of an element to lose electrons and form positive ions. While both Li and Mg are electropositive, their electropositive character is not the same due to the difference in their ionization energies and the number of valence electrons. **Conclusion for Step 2:** The reason is false because while the sizes of Li⁺ and Mg²⁺ are indeed different, their electropositive characters are not the same; lithium is more electropositive than magnesium. ### Final Conclusion: - The assertion is true, and the reason is false. Therefore, the correct answer is: **If assertion is true but reason is false.**
To analyze the assertion and reason provided in the question, we will break down the concepts step by step. ### Step 1: Understanding the Assertion **Assertion:** Lithium resembles magnesium diagonally placed in the next group. - Lithium (Li) is an alkali metal in Group 1, while magnesium (Mg) is an alkaline earth metal in Group 2. - The diagonal relationship in the periodic table indicates that elements in different groups but in the same period can exhibit similar properties due to comparable atomic sizes and charge densities. ...
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