Q.

Given below are two statements: one is labeled as Assertion (A) and the other is labeled 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

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a

(A) is true but (R) is false

b

(A) is false but (R) is true

c

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

d

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

answer is A.

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Detailed Solution

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As in d-block elements differentiating electron enters in ‘d’ orbital of penultimate shell. Therefore, effect of nuclear charge on outer shell will increase. Thus Assertion is correct Reason is also correct.

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