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Q.

Which of the element of Boron family has highest melting point?

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a

B

b

Tl

c

Al

d

Ga

answer is A.

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Detailed Solution

The icosahedral structure of boron consists of a rhombohedral unit cell with 12 atoms. Generally, an increase in the metallic character of the element, the boiling and melting point will decrease in the same direction. So boron has the highest melting point.

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Which of the element of Boron family has highest melting point?