JEE Main 202226 JulyEvening Shift

Exam: JEE Main
Year: 2022
Date: 26 July
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2022 · 26 July · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The metal that has very low melting point and its periodic position...

The metal that has very low melting point and its periodic position is closer to a metalloid is

Options

A $Al$
B $Ga$
C $Se$
D $In$

Correct answer

B. $Ga$

Step-by-step solution

The expected order of melting points of group 13 elements is $B > Al > Ga > In > Tl$ .
But due to structural changes, melting point instead of decreasing, increases from Ga to Tl and Ga has the lowest melting point. Hence, the actual order is $B > Al > Tl > In > Ga$
Melting point
$Al \to 933K$
$Ga \to 303K$
In \to 430K $</p><p>$ Se \to 490K
Ga has low meting point and it is closer to metalloid in periodic table.

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