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JEE Main Chemistry Class 11 Classification of Elements and Periodicity in Properties 1 Questions
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Question : 10
Total: 100
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 :
[31-Jan-2023 Shift 2]
Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true but (R) is not the correct explanation of
(
A
)
(A) is false but (R) is true
(
A
)
is true but (R) is false
Validate
Solution:
From Sc to Mn ionization energy is less than that of
Mg
For 3 d series:
Sc
Ti
V
Cr
Mn
IE
(
KJ
∕
mol
)
631
656
650
653
717
Fe
Co
Ni
Cu
Zn
IE
(
KJ
∕
mol
)
762
758
736
745
906
For
2
ad
Group
Be
Mg
Ca
Sr
Ba
Ra
IE
(
KJ
∕
mol
)
631
656
650
653
717
762
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