Questions  

A, B, C, D and E are the elements belonging to 13th group of Modern periodic table. The correct atomic radius trend for these elements is  A< B <C < D< E . The element ‘C' in the sequence is

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By Expert Faculty of Sri Chaitanya
ctaimg
a
Al
b
B
c
In
d
Ga
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detailed solution

Correct option is A

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;

ctaimg

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The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher B-F bond dissociation energy as compared to that of C-F bond is :

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