JEE MAIN - Chemistry (2023 - 31st January Evening Shift - No. 9)
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 $3 \mathrm{~d}$ 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 :
Assertion (A): The first ionization enthalpy of $3 \mathrm{~d}$ 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)
(A) is true but (R) is false
Both (A) and (R) are true but $(\mathbf{R})$ is not the correct explanation of (A)
(A) is false but (R) is true
Explanation
From Sc to Mn ionization energy is less than that of Mg.
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Reason (R) : The statement "In $3d$ series of elements successive filling of $d$-orbitals takes place" is indeed true. It describes the characteristic of $3d$ series elements where there is successive filling of $d$ orbitals as we move across the period.
Reason (R) : The statement "In $3d$ series of elements successive filling of $d$-orbitals takes place" is indeed true. It describes the characteristic of $3d$ series elements where there is successive filling of $d$ orbitals as we move across the period.
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