First slide

Atomic and physical properties

Question

Based on $E_{M^{+ 3} / M}^{0}$ value, the best oxidant is

Easy

A

Ga⁺³
B

Al⁺³
C

In⁺³
D

Tl⁺³

Solution

Atomic radius….B<Ga<Al<In<Tl;
IP₁…..B>Tl>Ga>Al>In;
MP…B>Al>Tl>In>Ga;
Boron has gaint polymeric structure,Gallium exists as Ga₂ molecule(M.P = 302 K)
BP….B>Al>Ga>In>Tl:
Difference in B.P and M.P in Gallium is about 2300 K. It has wide liquid range.It is athermometric liquid.
Density…B<Al<Ga<In<Tl;
EN…B>Tl>In>Ga>Al;
a) $E_{M^{3 +} M}^{o}$ is most -ve for Al and +ve for Tl;
Al is the best reductant and Tl³⁺ is the best oxidant
b) $E_{M^{+} / M}^{0}$ is positive only for Al;
Al⁺ is the best oxidant;

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