JEE Main 2019 — D And F Block Elements Question with Solution
From: JEE Main 2019 (Online) 10th April Evening Slot
Question
The correct order of the first ionization enthalpies is :
Choose an option
Show full solutionCorrect option: D
Correct answer
DTi < Mn < Ni < Zn
Step-by-step 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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This is a previous-year question from JEE Main 2019, covering the D And F Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.