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A, B, C, D and E are the elements belonging to 13^th group of Modern periodic table. The correct trend of melting pointfor these elements is A > B > C > D > E . The element ‘B' in the sequence is

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answer is A.

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Detailed 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;

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