JEE Main 20199 JanuaryMorning Shift

Exam: JEE Main
Year: 2019
Date: 9 January
Shift: Morning Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2019 · 9 January · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

Aluminium is usually found in + 3 oxidation state. In contrast,...

Aluminium is usually found in

+ 3

oxidation state. In contrast, thallium exists in

+ 1

and

+ 3

oxidation states. This is due to:

Options

ADiagonal relationship
BLattice effect
CLanthanoid contraction
DInert pair effect

Correct answer

D. Inert pair effect

Step-by-step solution

Reluctance in tendency of s-electrons to participate in bonding on moving top to bottom in p-block elements is called inert pair effect. Due to inert pair effect

+ 1

is very unstable in aluminium.

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