Q.

The element with least electronegativity on Pauling scale in 13th group is

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a

Ga

b

Al

c

Tl

d

In

answer is B.

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Detailed Solution

Atomic radius….BTl>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…BTl>In>Ga>Al;EM3+Mo is most -ve for Al and +ve for Tl;
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The element with least electronegativity on Pauling scale in 13th group is