JEE MAIN - Chemistry (2019 - 10th April Evening Slot - No. 11)
The correct order of the first ionization enthalpies is :
Ti < Mn < Zn < Ni
Zn < Ni < Mn < Ti
Mn < Ti < Zn < Ni
Ti < Mn < Ni < Zn
Explanation
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)
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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