JEE Main 201910 AprilEvening Shift

Exam: JEE Main
Year: 2019
Date: 10 April
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2019 · 10 April · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The correct order of the first ionization enthalpies is:

Options

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

Correct answer

B. $Ti < Mn < Ni < Zn$

Step-by-step solution

As we observe from left to right in a period, there is a gradual increase in ionization potential due to the increase in Nuclear charge.
From left to right, the elements will be $Ti\left(22\right), Mn\left(25\right), Ni ( 28 ) , Zn ( 30 )$ .
Hence, the correct order will be:
$Ti < Mn < Ni < Zn .$

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