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Q.

Which of the following graph represents the order among the melting points of IIIA group elements

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a

b

c

d

answer is B.

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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 consistsof 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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