Assertion (A): The first ionization enthalpy of 3d series elements is more than that of group 2 metals. Reason (R): In 3d series of elements successive filling of d-orbitals takes place. [2023]

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Q.
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 3d 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: [2023]

1 Both (A) and (R) are true and (R) is the correct explanation of (A).

2 (A) is true but (R) is false.

3 (A) is false but (R) is true.

4 Both (A) and (R) are true but (R) is not the correct explanation of (A).

Ans.
(1)

Metal Sc Ti V Cr Mn Fe Co Ni Cu Zn

IE (kJ/mol) 631 656 650 653 717 762 758 736 745 906

Metal Be Mg Ca Sr Ba Ra

IE (kJ/mol) 899 737 590 549 503 509

Solution

1 Both (A) and (R) are true and (R) is the correct explanation of (A).

2 (A) is true but (R) is false.

3 (A) is false but (R) is true.

4 Both (A) and (R) are true but (R) is not the correct explanation of (A).

Ans.
(1)

Metal Sc Ti V Cr Mn Fe Co Ni Cu Zn

IE (kJ/mol) 631 656 650 653 717 762 758 736 745 906

Metal Be Mg Ca Sr Ba Ra

IE (kJ/mol) 899 737 590 549 503 509

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Metal	Sc	Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn
IE (kJ/mol)	631	656	650	653	717	762	758	736	745	906

Solution

1 Both (A) and (R) are true and (R) is the correct explanation of (A).

2 (A) is true but (R) is false.

3 (A) is false but (R) is true.

4 Both (A) and (R) are true but (R) is not the correct explanation of (A).

Ans. (1) Metal Sc Ti V Cr Mn Fe Co Ni Cu Zn IE (kJ/mol) 631 656 650 653 717 762 758 736 745 906 Metal Be Mg Ca Sr Ba Ra IE (kJ/mol) 899 737 590 549 503 509

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Ans.
(1)

Metal Sc Ti V Cr Mn Fe Co Ni Cu Zn

IE (kJ/mol) 631 656 650 653 717 762 758 736 745 906

Metal Be Mg Ca Sr Ba Ra

IE (kJ/mol) 899 737 590 549 503 509