Q7 / 90 · JEE Main 2023 (24 Jan Shift 2) · Chemistry

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 Be2+but relatively large value of atomisation enthalpy.

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

  • A
    A is correct but R is not correct
  • Correct answer
    B
    Both A and R are correct and R is the correct explanation of A
  • C
    A is not correct but R is correct
  • D
    Both A and R are correct and R is NOT the correct explanation of A

Solution

Beryllium has the smallest atomic size amongst the alkaline earth metals. The loss of electrons or oxidation is difficult. Beryllium has the least oxidation potential. As Beryllium has the least oxidation potential, it has the highest reduction potential(Less negative value of reduction potential). However, it's reducing nature is due to large hydration energy associated with the small size of Be2+ ion and relatively large value of the atomisation enthalpy of metal.

Hence, the correct answer is option: 'B'.

Relevant Questions