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Q.

The first ionisation energies of the elements of the first transition series (Ti + Cu)

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a

Increases as the atomic number increases

b

Decreases as the atomic number increases

c

Do not show any change as the addition of electrons takes place in the inner (n - i) d-orbitals

d

Increases from Ti to Mn and then decreases from Mn to Cu

answer is A.

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Detailed Solution

IE1 of 3d-series increases with increase in atomic number due  to (i) increase in nuclear charge and (ii) decrease in atomic size.
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