MCQ
Given below are two statements : one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$

Assertion $(A)$ : The first ionization enthalpy of $3 d$ series elements is more than that of group $2$ metals

Reason $(R)$ : In $3d$ series of elements successive filling of d-orbitals takes place.

In the light of the above statements, choose the correct answer from the options given below :

  • Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
  • B
    Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A)$
  • C
    $(A)$ is false but $(R)$ is true
  • D
    $(A)$ is true but $(R)$ is false

Answer

Correct option: A.
Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
a
From Sc to Mn ionization energy is less than that of $Mg$.

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