The correct order of melting points of IIIA group elements is

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B > Al > Tl > In > Ga

B > Al > Ga > In > Tl

B > Al > Tl > Ga > In

B > Al > In > Tl > Ga

answer is A.

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Detailed Solution

→ The melting point of Boron is very high because of its gaint covalent polymeric structure.→The low melting point of Gallium is due to Gallium consists f discrete diatomic molcules which are held by weak Vander waals forces of attractions.Melting point order: B > Al >Tl >In > Ga.

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