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Question:

The correct order of the first ionization enthalpies is:

Ti<Mn<Ni<Zn

Zn<Ni<Mn<Ti

Mn<Ti<Zn<Ni

Ti<Mn<Zn<Ni

Solution:

Correct option is B. Ti<Mn<Ni<Zn
Ti→[Ar]3d²
Mn→[Ar]3d⁵
Ni→[Ar]3d⁸
Zn→[Ar]3d¹⁰
Correct order of I.P. is [Ti<Mn<Ni<Zn].