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Q.

Boron has the least atomic size in 13th group. After Boron, atomic radius is least for

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a

Al

b

Ga

c

In

d

Tl

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;EM+/M0 is positive for Al;
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