Verified Solution • 2025–26 Session moderate

QJEEM19Ch42e3: JEE Main 2019 Chemistry - Class 12 JEEM19Ch42e3 Solution: The correct order of the first ionization enthalpies is :

The correct order of the first ionization enthalpies is :

Multiple Choice Options

  • A Ti < Mn < Zn < Ni
  • B Zn < Ni < Mn < Ti
  • C Mn < Ti < Zn < Ni
  • D Ti < Mn < Ni < Zn

Step-by-Step Verified Solution

In a period, from left to right ionization enthalpy increses.

So in period 4, correct order for those 4 elements is

Ti < Mn < Ni < Zn

Exceptions in period 4 are

(1) V(Vanadium) < Ti(Titanium)

(2) Ni(Titanium) < Co(Cobalt)

(3) Ga(Gallium) < Zn(Zinc)

(4) Se(Selenium) < As(Arsenic)

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