Verified Solution • 2025–26 Session
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QJEEM23Ch1d2e: JEE Main 2023 Chemistry - Class 11 JEEM23Ch1d2e Solution: Given below are two statements, one is labelled as Assertion A…
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Beryllium has less negative value of reduction potential compared to the other alkaline earth metals.
Reason R : Beryllium has large hydration energy due to small size of Be but relatively large value of atomization enthalpy
In the light of the above statements, choose the most appropriate answer from the options given below :
Multiple Choice Options
- A Both A and R are correct but R is NOT the correct explanation of A
- B Both A and R are correct and R is the correct explanation of A
- C A is correct but R is not correct
- D A is not correct but R is correct
Step-by-Step Verified Solution
The most appropriate answer is Both A and R are correct and R is the correct explanation of A.
Assertion A states that beryllium has a less negative value of reduction potential compared to the other alkaline earth metals. This assertion is correct, as beryllium has higher ionization energy and a smaller atomic radius than the other alkaline earth metals, which makes it more difficult to reduce Be2+ to Be metal.
Reason R provides an explanation for Assertion A. Beryllium has a relatively large value of atomization enthalpy due to the strong Be-Be bonds in the solid state, but it also has a large hydration energy due to the small size of Be2+ ions. The strong Be-Be bonds make it difficult to reduce Be2+ to Be metal, and the small size of Be2+ ions leads to a large hydration energy. This makes it energetically unfavorable to remove the Be2+ ion from the aqueous phase and reduce it to Be metal, which results in a less negative value of reduction potential for beryllium.
Therefore, both Assertion A and Reason R are correct, and Reason R provides the correct explanation for Assertion A.
Assertion A states that beryllium has a less negative value of reduction potential compared to the other alkaline earth metals. This assertion is correct, as beryllium has higher ionization energy and a smaller atomic radius than the other alkaline earth metals, which makes it more difficult to reduce Be2+ to Be metal.
Reason R provides an explanation for Assertion A. Beryllium has a relatively large value of atomization enthalpy due to the strong Be-Be bonds in the solid state, but it also has a large hydration energy due to the small size of Be2+ ions. The strong Be-Be bonds make it difficult to reduce Be2+ to Be metal, and the small size of Be2+ ions leads to a large hydration energy. This makes it energetically unfavorable to remove the Be2+ ion from the aqueous phase and reduce it to Be metal, which results in a less negative value of reduction potential for beryllium.
Therefore, both Assertion A and Reason R are correct, and Reason R provides the correct explanation for Assertion A.