Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The energy required to form \(Mg^{2+}\) from Mg is much higher than that required to produce \(Mg^+\)
Reason R: \(Mg^{2+}\) is small ion and carry more charge than \(Mg^{+}\).
In the light of the above statements, choose the correct answer from the options given below.

• A. A is true but R is false
• B. A is false but R is true
• C. Both A and R are true and R is the correct explanation of A
• D. Both A and R are true but R is NOT the correct explanation of A

Answer 1

The Correct Option is C

Step 1: Understanding Assertion A
The formation of \( \text{Mg}^{2+} \) requires the removal of two electrons, whereas the formation of \( \text{Mg}^+ \) involves the removal of only one electron. Since removing more electrons requires more energy, the energy needed to form \( \text{Mg}^{2+} \) is significantly higher than that required for \( \text{Mg}^+ \).
Step 2: Understanding Reason R
Reason R is correct because the smaller size of \( \text{Mg}^{2+} \) results in a higher charge density, which makes it more stable but also harder to form compared to \( \text{Mg}^+ \).
Therefore, both Assertion A and Reason R are true, and Reason R provides the correct explanation for Assertion A.